Aggregates of matter in outer space, such as stars, planets, comets, etc. and the properties and processes they undergo.
The fifth planet in order from the sun. It is one of the five outer planets of the solar system. Its sixteen natural satellites include Callisto, Europa, Ganymede, and Io.
Eating an excess amount of food in a short period of time, as seen in the disorder of BULIMIA NERVOSA. It is caused by an abnormal craving for food, or insatiable hunger also known as "ox hunger".
Celestial bodies orbiting around the sun or other stars.
The illumination of an environment and the arrangement of lights to achieve an effect or optimal visibility. Its application is in domestic or in public settings and in medical and non-medical environments.
A country in northern Africa, bordering the Mediterranean Sea, between Libya and the Gaza Strip, and the Red Sea north of Sudan, and includes the Asian Sinai Peninsula Its capital is Cairo.
Directions or principles presenting current or future rules of policy for assisting health care practitioners in patient care decisions regarding diagnosis, therapy, or related clinical circumstances. The guidelines may be developed by government agencies at any level, institutions, professional societies, governing boards, or by the convening of expert panels. The guidelines form a basis for the evaluation of all aspects of health care and delivery.
The guidelines and policy statements set forth by the editor(s) or editorial board of a publication.
A publication issued at stated, more or less regular, intervals.
Copies of a work or document distributed to the public by sale, rental, lease, or lending. (From ALA Glossary of Library and Information Science, 1983, p181)
A contagious disease caused by canine adenovirus (ADENOVIRUSES, CANINE) infecting the LIVER, the EYE, the KIDNEY, and other organs in dogs, other canids, and bears. Symptoms include FEVER; EDEMA; VOMITING; and DIARRHEA.
Persons living in the United States having origins in any of the black groups of Africa.
"The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.
The practice of medicine as applied to special circumstances associated with military operations.
Persons including soldiers involved with the armed forces.
A cabinet department in the Executive Branch of the United States Government whose mission is to provide the military forces needed to deter WARFARE and to protect the security of our country.
Hostile conflict between organized groups of people.
Agencies of the FEDERAL GOVERNMENT of the United States.
Administrative units of government responsible for policy making and management of governmental activities.
Fabric or other material used to cover the body.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
Clothing designed to protect the individual against possible exposure to known hazards.
NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.
The destroying of all forms of life, especially microorganisms, by heat, chemical, or other means.
Information intended for potential users of medical and healthcare services. There is an emphasis on self-care and preventive approaches as well as information for community-wide dissemination and use.
Platforms that provide the ability and tools to create and publish information accessed via the INTERNET. Generally these platforms have three characteristics with content user generated, high degree of interaction between creator and viewer, and easily integrated with other sites.
Stress wherein emotional factors predominate.
The field concerned with the interrelationship between the brain, behavior and the immune system. Neuropsychologic, neuroanatomic and psychosocial studies have demonstrated their role in accentuating or diminishing immune/allergic responses.
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
The edible portions of any animal used for food including domestic mammals (the major ones being cattle, swine, and sheep) along with poultry, fish, shellfish, and game.
A biochemical messenger and regulator, synthesized from the essential amino acid L-TRYPTOPHAN. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Multiple receptor families (RECEPTORS, SEROTONIN) explain the broad physiological actions and distribution of this biochemical mediator.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
A competitive team sport played on a rectangular court having a raised basket at each end.
The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.
The consumption of animal flesh.
The scientific disciplines concerned with the embryology, anatomy, physiology, biochemistry, pharmacology, etc., of the nervous system.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Elements of limited time intervals, contributing to particular results or situations.
The science concerned with celestial bodies and the observation and interpretation of the radiation received in the vicinity of the earth from the component parts of the universe (McGraw Hill Dictionary of Scientific and Technical Terms, 5th ed)
Time period from 1901 through 2000 of the common era.
An island in the Gulf of St. Lawrence constituting a province of Canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is Charlottetown. Discovered by the French in 1534 and originally named Ile Saint-Jean, it was renamed in 1799 in honor of Prince Edward, fourth son of George III and future father of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p981 & Room, Brewer's Dictionary of Names, 1992, p433)
Metastatic lesion of the UMBILICUS associated with intra-abdominal neoplasms especially of the GASTROINTESTINAL TRACT or OVARY.
Time period from 1801 through 1900 of the common era.
The pit in the center of the ABDOMINAL WALL marking the point where the UMBILICAL CORD entered in the FETUS.
Method of making images on a sensitized surface by exposure to light or other radiant energy.
Pesticides used to destroy unwanted vegetation, especially various types of weeds, grasses (POACEAE), and woody plants. Some plants develop HERBICIDE RESISTANCE.
Derivatives of GLUCURONIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that include the 6-carboxy glucose structure.
An analytical technique for resolution of a chemical mixture into its component compounds. Compounds are separated on an adsorbent paper (stationary phase) by their varied degree of solubility/mobility in the eluting solvent (mobile phase).
The teaching ascribed to Gautama Buddha (ca. 483 B.C.) holding that suffering is inherent in life and that one can escape it into nirvana by mental and moral self-purification. (Webster, 3d ed)
Inorganic salts of HYDROGEN CYANIDE containing the -CN radical. The concept also includes isocyanides. It is distinguished from NITRILES, which denotes organic compounds containing the -CN radical.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.

UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers. (1/47)

Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones, and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis.  (+info)

Condensation of carbon in radioactive supernova gas. (2/47)

Chemistry resulting in the formation of large carbon-bearing molecules and dust in the interior of an expanding supernova was explored, and the equations governing their abundances were solved numerically. Carbon dust condenses from initially gaseous carbon and oxygen atoms because energetic electrons produced by radioactivity in the supernova cause dissociation of the carbon monoxide molecules, which would otherwise form and limit the supply of carbon atoms. The resulting free carbon atoms enable carbon dust to grow faster by carbon association than the rate at which the dust can be destroyed by oxidation. The origin of presolar micrometer-sized carbon solids that are found in meteorites is thereby altered.  (+info)

In search of planets and life around other stars. (3/47)

The discovery of over a dozen low-mass companions to nearby stars has intensified scientific and public interest in a longer term search for habitable planets like our own. However, the nature of the detected companions, and in particular whether they resemble Jupiter in properties and origin, remains undetermined.  (+info)

Black holes in the milky way galaxy. (4/47)

Extremely strong observational evidence has recently been found for the presence of black holes orbiting a few relatively normal stars in our Milky Way Galaxy and also at the centers of some galaxies. The former generally have masses of 4-16 times the mass of the sun, whereas the latter are "supermassive black holes" with millions to billions of solar masses. The evidence for a supermassive black hole in the center of our galaxy is especially strong.  (+info)

Is redshift-dependent evolution of galaxies a theoretical artifact? (5/47)

The physical validity of the hypothesis of (redshift-dependent) luminosity evolution in galaxies is tested by statistical analysis of an intensively studied complete high-redshift sample of normal galaxies. The necessity of the evolution hypothesis in the frame of big-bang cosmology is confirmed at a high level of statistical significance; however, this evolution is quantitatively just as predicted by chronometric cosmology, in which there is no such evolution. Since there is no direct observational means to establish the evolution postulated in big-bang studies of higher-redshift galaxies, and the chronometric predictions involve no adjustable parameters (in contrast to the two in big-bang cosmology), the hypothesized evolution appears from the standpoint of conservative scientific methodology as a possible theoretical artifact.  (+info)

Neutrinos. (6/47)

Neutrinos represent a new "window" to the Universe, spanning a large range of energy. We discuss the science of neutrino astrophysics and focus on two energy regimes. At "lower" energies ( approximately 1 MeV), studies of neutrinos born inside the sun, or produced in interactions of cosmic rays with the atmosphere, have allowed the first incontrovertible evidence that neutrinos have mass. At energies typically one thousand to one million times higher, sources further than the sun (both within the Milky Way and beyond) are expected to produce a flux of particles that can be detected only through neutrinos.  (+info)

Titanium carbide nanocrystals in circumstellar environments. (7/47)

Meteorites contain micrometer-sized graphite grains with embedded titanium carbide grains. Although isotopic analysis identifies asymptotic giant branch stars as the birth sites of these grains, there is no direct observational identification of these grains in astronomical sources. We report that infrared wavelength spectra of gas-phase titanium carbide nanocrystals derived in the laboratory show a prominent feature at a wavelength of 20.1 micrometers, which compares well to a similar feature in observed spectra of postasymptotic giant branch stars. It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass loss (>0.001 solar masses per year) in dying, low-mass stars.  (+info)

Windows through the dusty disks surrounding the youngest low-mass protostellar objects. (8/47)

The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the Infrared Space Observatory the mid-infrared (mid-IR) emission associated with the class 0 protostar VLA1 in the HH1-HH2 region located in the Orion nebula. The emission arises in three wavelength windows (at 5. 3, 6.6, and 7.5 micrometers) where the absorption due to ices and silicates has a local minimum that exposes the central part of the young protostellar system to mid-IR investigations. The mid-IR emission arises from a central source with a diameter of 4 astronomical units at an averaged temperature of approximately 700 K, deeply embedded in a dense region with a visual extinction of 80 to 100 magnitudes.  (+info)

We studied 14 presolar SiC mainstream grains for C-, Si-, and S-isotopic compositions and S elemental abundances. Ten grains have low levels of S contamination and CI chondrite-normalized S/Si ratios between 2 × 10−5 and 2 × 10−4. All grains have S-isotopic compositions compatible within 2σ of solar values. Their mean S isotope composition deviates from solar by at most a few percent, and is consistent with values observed for the carbon star IRC+10216, believed to be a representative source star of the grains, and the interstellar medium. The isotopic data are also consistent with stellar model predictions of low-mass asymptotic giant branch (AGB) stars. In a δ33S versus δ34S plot the data fit along a line with a slope of 1.8 ± 0.7, suggesting imprints from galactic chemical evolution. The observed S abundances are lower than expected from equilibrium condensation of CaS in solid solution with SiC under pressure and temperature conditions inferred from the abundances of more ...
TY - JOUR. T1 - Constraining phosphorus chemistry in carbon- and oxygen-rich circumstellar envelopes. T2 - Observations of PN, HCP, and CP. AU - Milam, S. N.. AU - Halfen, D. T.. AU - Tenenbaum, E. D.. AU - Apponi, A. J.. AU - Woolf, N. J.. AU - Ziurys, L. M.. PY - 2008/9/1. Y1 - 2008/9/1. N2 - Millimeter-wave observations of PN, CP, and HCP have been carried out toward circumstellar envelopes of evolved stars using the Arizona Radio Observatory (ARO). HCP and PN have been identified in the carbon-rich source CRL 2688 via observations at 1 mm using the Submillimeter Telescope (SMT) and 2-3 mm with the Kitt Peak 12 m. An identical set of measurements were carried out toward IRC +10216, as well as observations of CP at 1 mm. PN was also observed toward VY Canis Majoris (VY CMa), an oxygen-rich supergiant star. The PN and HCP line profiles in CRL 2688 and IRC +10216 are roughly flat topped, indicating unresolved, optically thin emission; CP, in contrast, has a distinct U shape in IRC +10216. ...
Corundum mineral information page at mineralminers.com: your on-line link for corundum scientific facts and corundum mineralogical information - all about natural corundum - with links to all varieties of natural corundum as well information on worldwide corundum mining locations and background info for each corundum variety regarding corundum physical properties, corundum geologic occurance, corundum metaphysical information and uses of corundum, and the history of corundum.
An intermediate-mass black hole (IMBH) is a hypothetical class of black hole with mass in the range 100 to one million[citation needed] solar masses: significantly more than stellar black holes but less than supermassive black holes. There is as yet no unambiguous detection of an IMBH, but the indirect evidence from various directions is promising. The strongest evidence for IMBHs comes from a few low-luminosity active galactic nuclei. Due to their activity, these galaxies almost certainly contain accreting black holes, and in some case the black hole masses can be estimated using the technique of reverberation mapping. For instance, the spiral galaxy NGC 4395 at a distance of about 4 Mpc appears to contain a black hole with mass of about 3.6×105 solar masses.[relevant? - discuss] Some ultra-luminous X ray sources (ULXs) in nearby galaxies are suspected to be IMBHs, with masses of a hundred to a thousand solar masses. The ULXs are observed in star-forming regions (e.g., in starburst galaxy ...
ADC_Keywords: Stars, S ; Mass loss ; Masers ; Photometry, infrared Keywords: stars: mass-loss - stars: AGB - stars: late-type - infrared: stars - radio lines: stars Abstract: It is the purpose of this paper to rediscuss the circumstellar properties of S stars and to put these properties in perspective with our current understanding of the evolutionary status of S stars, in particular the intrinsic/extrinsic dichotomy. This dichotomy states that only Tc-rich (intrinsic) S stars are genuine thermally-pulsing asymptotic giant branch stars, possibly involved in the M-S-C evolutionary sequence. Tc-poor S stars are referred to as extrinsic S stars, because they are the cooler analogs of barium stars, and like them, owe their chemical peculiarities to mass transfer across their binary system. Accordingly, an extensive data set probing the circumstellar environment of S stars (IRAS flux densities, maser emission, CO rotational lines) has been collected and critically evaluated. This data set ...
Black holes are an important area of research for theoretical physics as the behavior of the strong gravitational fields near the singularity of a black hole likely involve both gravitational and quantum effects. Understanding the behavior and properties of black holes tackles the ultimate goal of theoretical physics, unifying all known physical forces into a single theory. Recently, there has been much work done in understanding the thermodynamics of black holes, relating the properties of black holes to the laws of thermodynamics as well as understanding the concepts of information and entropy in the case of black holes. Considering black hole thermodynamics puts quantum effects and classical gravity in discussion with each other, as quantum field theory based descriptions of the Standard Model interactions on a curved spacetime around a black hole dictate black hole thermodynamics. In the course of this paper, I will derive and outline the various laws of black hole thermodynamics and discuss Hawking
Methanol Masers as Tracers of Circumstellar Disks: We show that in many methanol maser sources the masers are located in lines, with a velocity gradient along t
Supernova Sonata by Alex Parker From April, 2003 until August, 2006, the Canada-France-Hawaii Telescope watched four parts of the sky as often as possible. Armed with the largest digital camera in the known universe, CFHT monitored these four fields for a special type of supernova (called Type Ia) which are created by the thermonuclear detonation of one or more white-dwarf stars. Each supernova is assigned a note to be played: The volume of the note is determined by the distance to the supernova, with more distant supernova being quieter and fainter. The pitch of the note was determined by the supernovas stretch, a property of how the supernova brightens and fades. Higher stretch values played higher notes. The pitches were drawn from a Phrygian dominant scale. The instrument the note was played on was determined by the properties of the galaxy which hosted each supernova. Supernovae hosted by massive galaxies are played with a stand-up bass, while supernovae hosted by less massive galaxies ...
In a newly published study, astronomers reveal evidence for a new intermediate-mass black hole about 5,000 times the mass of the sun. Nearly all black holes come in one of two sizes: stellar mass black holes that weigh up to a few dozen times the mass of our sun or supermassive black holes ranging from a million to several billion times the suns mass. Astronomers believe that medium-sized black holes between these two extremes exist, but evidence has been hard to come by, with roughly a half-dozen candidates described so far.. A team led by astronomers at the University of Maryland and NASAs Goddard Space Flight Center has found evidence for a new intermediate-mass black hole about 5,000 times the mass of the sun. The discovery adds one more candidate to the list of potential medium-sized black holes, while strengthening the case that these objects do exist. The team reported its findings in the September 21, 2015 online edition of Astrophysical Journal Letters.. The result follows up on a ...
The black hole located in HR 6819 points to an exciting (or terrifying) possibility. Nearly all of the black holes discovered within our galaxy to date have been violent ones that absorb the stars and planets around them, creating powerful x-rays as a result. This black hole is different as it exists quietly in its own system, undetected for years. This could mean there are thousands of black holes relatively close to our solar system, but we just havent seen them yet! The astronomers involved also believe a second system, LB-1, could contain a similar black hole - however more research is needed to determine this. On of our own Astronomers, Dr. Andreas Sander, has broken down what this discovery could mean for identifying future Black Holes. The discovery in the HR6819 system is a good example of how we extend our knowledge about stars and their lives and deaths. We know that Black Holes exist and that massive stars eventually end up collapsing into a Black Hole. But how massive do they need ...
Of Contraction of the Universe which Finally Becomes Dominant in the Big Crunch!. In the interest of accuracy and also to mention that this information is being misused by NASA and other U.S. government propagandists to try to distract from and obscure the significance of black holes and the central role black holes play in the process of contraction of the Universe, which ultimately becomes dominant over the simultaneous process of expansion. First, it is a fact that matter generally enters a black hole through a combination of both gravitation and magnetism. Matter in the accretion disk which spins around the black hole can only enter the black hole after it loses its angular momentum. The inertia of the material in the accretion disk keeps it spiraling in a disk rather than falling straight into the black hole. The inertia in turn is due to the mass of the material in the disc and the gravitational field caused by the extremely rapid rotation of the black hole itself. An accretion disc is a ...
Of Contraction of the Universe which Finally Becomes Dominant in the Big Crunch!. In the interest of accuracy and also to mention that this information is being misused by NASA and other U.S. government propagandists to try to distract from and obscure the significance of black holes and the central role black holes play in the process of contraction of the Universe, which ultimately becomes dominant over the simultaneous process of expansion. First, it is a fact that matter generally enters a black hole through a combination of both gravitation and magnetism. Matter in the accretion disk which spins around the black hole can only enter the black hole after it loses its angular momentum. The inertia of the material in the accretion disk keeps it spiraling in a disk rather than falling straight into the black hole. The inertia in turn is due to the mass of the material in the disc and the gravitational field caused by the extremely rapid rotation of the black hole itself. An accretion disc is a ...
Context. Intermediate-mass black holes (IMBHs) may provide the missing link to understanding the growth of supermassive black holes in the early Universe. Some formation scenarios predict that IMBHs could have formed by runaway collisions in globular clusters (GCs). However, it is challenging to set observational constraints on the mass of a black hole in a largely gas-free (and hence accretion-free) stellar system such as a GC. Understanding the influence of an IMBH in the center of a GC on its environment might provide indirect detection methods. Aims. Our goal is to test the effects of different initial compositions of GCs on their evolution in a tidal field. We pin down the crucial observables that indicate the presence of an IMBH at the center of the cluster. In addition to central IMBHs, we also consider the effects of different stellar-mass black hole retention and stellar binary fractions. Methods. We performed a set of 22 N-body simulations and varied particle numbers, IMBH masses, ...
The LIGO Scientific Collaboration and the Virgo Collaboration recently announced the discovery of GW190521, the most massive gravitational wave binary observed to date, and Rochester Institute of Technology scientists played an important role in identifying and analyzing the event. They detected the signal with the National Science Foundations Laser Interferometer Gravitational-wave Observatory (LIGO). The two inspiralling black holes had masses of about 85 and 66 solar masses, and resulted in the formation of a black hole remnant of 142 solar masses, providing the first clear detection of an intermediate-mass black hole.. Were seeing something more massive than weve seen before, past the point where we thought that we could form black holes, said Associate Professor Richard OShaughnessy, a member of CCRG and the LIGO Scientific Collaboration. Its therefore suggesting that our previous understanding was incomplete or maybe theres more out there than we previously envisioned.. Not ...
A Black Hole is a region of space in which the gravitational field is so powerful that nothing can escape after it has past the event horizon of the Black Hole. The reason it is called a Black hole is that even light is unable to escape it. Black holes can be detected, when a black hole interacts with matter out-side of the event horizon a large amount of radiation emits from it. Black holes are currently understood by Einsteins general theory of relativity, which was formed in 1916. The idea of an object with a gravitational pull strong enough to prevent light escaping from it was first thought of in the 18th century. Einsteins theory predicts that when a large enough amount of mass is present within a sufficiently small region of space, all paths through space are warped inwards towards the center of the volume, forcing all matter and radiation to fall inward. While general relativity describes a black hole as a region of empty space with a pointlike singularity at the center and an event ...
Like many other spiral galaxies in the Universe, the Milky Way Galaxy consists of two disk-like structures - the thin disk and the thick disk. The thick disk, which envelopes the thin disk, contains about 20% of the Milky Ways stars and is thought to be the older of the pair based on the composition of its stars (which have greater metallicity) and its puffier nature. However, in a recent study, a team of 38 scientists led by researchers from Australias ARC Centre of Excellence for All Sky Astrophysics in Three Dimensions (ASTRO-3D) used data from the now-retired Kepler mission to measure starquakes in the Milky Ways disk. From this, they have revised the official estimates on the age of the Milky Ways thick disk, which they conclude is around 10 billion years old. The study which describes their findings - titled The K2-HERMES Survey: age and metallicity of the thick disc - recently appeared in the Monthly Notices of the Royal Astronomical Society. The research team was led by Dr. Sanjib ...
These positrons are born at nearly the speed of light, and travel thousands of light years before they slow down enough in dense clouds of gas to have a chance of joining with an electron to annihilate in a dance of death, explains Higdon. Their slowing down occurs from the drag of other particles during their journey through space. Their journey is also impeded by the many fluctuations in the galactic magnetic field that scatter them back and forth as they move along. All of this must be taken into account in calculating the average distance the positrons would travel from their birthplaces in supernova explosions. Some positrons head towards the center of the Galaxy, some towards the outer reaches of the Milky Way known as the galactic halo, and some are caught in the spiral arms, said Rothschild. While calculating this in detail is still far beyond the fastest supercomputers, we were able to use what we know about how electrons travel throughout the solar system and what can be inferred ...
In the available supporting (yet unreliable) study regarding the REACH endpoint toxicity to soil microorganisms, toxicity o f TiO2 to soil bacteria was determined in the Biolog test over 7 consecutive days. No effects could be observed. The authors report the EC50 (7 d) to be , 100 mg TiO2/L. This result may in principle be used in a read-across approach to cover the endpoint requirements for the REACH registration of TiC. Toxic effects to soil microorganisms arise from exposure via soil pore water. Due to lower transformation/dissolution results for titanium carbide (the target substance) than titanium dioxide (the source substance), the resulting toxicity potential of TiC is also expected to be lower. Therefore, the dose descriptors are expected to be sufficiently high for the target substance, and read-across to the source chemical is adequately protective. In fact, (eco-)toxicologically relevant release of Ti ions from titanium carbide is not expected as the concentration of soluble Ti ...
As nuclear fuel deep within a star is burned, instabilities occur. These instabilities may result in a rapid increase in heating, which may be seen as mass loss driven by a thermal pulse in Asymptotic Giant Branch (AGB) stars. Nuclear-processing enriches the outer envelopes of the star, and as dense warm material enriched in C, N, O, P, S and Si deep in the star cools, condensation produces stardust. The dust is accelerated outward during pulses and drags gas along with it into the circumstellar envelope, which may be imaged in dust continuum or in the lines of molecules such as CO, SiO and their isotopic variants. Thus, ALMA provides a sensitive probe of not only the physics of the stellar matter but of its nucleosynthetic origins. ALMAs high resolution can identify unknown components of stellar systems while its spectral line sensitivity can provide insight into isotopic variations within lost-mass shells and into dust formation processes near the stellar photosphere.. After the outer shell ...
A theoretical study of the interaction between supernovae and their surroundings is presented.. Supernovae are the endpoint of the life of massive stars, and are the dominant contributors to the chemical evolution of the Universe. During its life a massive star greatly modifies its environment. During and after the explosion of the star it interacts with its surroundings in a number of ways. A study of this interaction yields invaluable information about the late stages of stellar evolution and the physics of supernova explosions. Recent advances in observational facilities have given a wealth of observational data on interacting supernovae, and it is therefore essential to have good theoretical models for interpreting the data.. This thesis presents an overview of the physics of supernovae and of their interaction with a circumstellar medium. In particular the reverse shock created by the interaction is investigated. In most Type IIL and Type IIn supernovae this shock is radiative, and due to ...
The galaxy next door, Andromeda, is twice as massive as our own Milky Way galaxy, a new paper published online today in the Monthly Notices of the Royal Astronomical Society concludes. Astronomers have long known that Andromeda is bigger and brighter than the Milky Way, but some studies have suggested that our galaxy packs in enough extra invisible dark matter to beat it in total bulk. Now, calculations based on the latest measurements of galactic distances and motions show that each galaxy contains the same proportion of dark matter-about 90%-and that Andromeda is top dog after all.. ...
Just like normal black holes, they are regions of space-time with gravitational effects so strong that even electromagnetic radiation such as light can not escape from inside of them.. Julie Comerford, an astronomer at the University of Colorado Boulder, has led a team of scientists in analyzing this particular black hole and its two burps.. The Hubble telescope then picked up clouds of blue-green gas emerging from the black hole from a previous burp. While these two events are thought to have happened some 100,000 years apart, thats actually an incredibly short period of time when were talking about black hole activity. While even light can not escape the pull of one of these gravity wells, blacks holes do, very occasionally, burp back out chunks of half-consumed gas.. A paper on the subject was published in a recent issue of The Astrophysical Journal.. The black hole in question, known as J1354, is situated about 800 million light years from Earth and was studied using data captured by ...
Scientists have, for the first time, captured an image of a black hole. The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials. The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole.The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials.The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole.The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials.The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole.The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials.The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole.The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials.The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole. The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials. The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Scientists have, for the first time, captured an image of a black hole. The image, captured by the Event Horizon Telescope, shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun, according to EHT officials. The image is the first visual evidence of a supermassive black hole. The shadow of a black hole is the closest scientists are able to get to taking a photo of the black hole itself, since black holes are
Most galaxies in the universe, including our own Milky Way, harbor super-massive black holes varying in mass from about one million to about 10 billion times the mass of our sun. To find them, astronomers look for the enormous amount of radiation emitted by gas which falls into such objects during the times that the black holes are active, i.e., accreting matter. This gas infall into massive black holes is believed to be the means by which black holes grow.
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What shape is the Milky Way? - The Milky Way shape is most likely in the form of a spiral galaxy because of its disc shape. Learn more about the shape of the Milky Way galaxy.
The black hole is like a generator spinning around in these magnetic fields, said BYU professor David Neilsen, lead author of the study. The way the field lines get twisted around and pulled by the spinning black hole creates electromagnetic tension that gets turned into radiation and energy that goes out.. One black hole in the galaxy Centauras A propels radiation in a jet measuring 1 million light-years long.. The spin of black holes has been believed to play a role since the idea was put forward in 1977. The new study confirms this theory while also introducing a totally new component: that a black holes lateral movement also powers these jets.. ...
The biggest known explosion in the universe has been spotted by astronomers - and it was so intense it punched a crater the size of 15 Milky Way galaxies into a part of space hundreds of millions of light-years away. Scientists say theyve never seen anything like it. According to a study published Thursday in The Astrophysical Journal, astronomers discovered the record-breaking eruption using X-ray data from several sources, including NASAs Chandra X-ray Observatory and ESAs XMM-Newton, and radio data from the Murchison Widefield Array (MWA) in Australia and the Giant Metrewave Radio Telescope (GMRT) in India. It was so massive, they have little to compare it to. In some ways, this blast is similar to how the eruption of Mt. St. Helens in 1980 ripped off the top of the mountain, lead author Simona Giacintucci of the Naval Research Laboratory in Washington, DC said in a press release Thursday. A key difference is that you could fit fifteen Milky Way galaxies in a row into the crater this ...
Normally, when a massive star reaches the end of its life, its core collapses into a single black hole. But if the star was spinning very rapidly, its core might stretch into a dumbbell shape and fragment into two clumps, each forming its own black hole.. A very massive star as needed here often forms out of the merger of two smaller stars. And since the stars would have revolved around each other faster and faster as they spiraled together, the resulting merged star would be expected to spin very quickly.. After the black hole pair formed, the stars outer envelope rushed inward toward them. In order to power both the gravitational wave event and the gamma-ray burst, the twin black holes must have been born close together, with an initial separation of order the size of the Earth, and merged within minutes. The newly formed single black hole then fed on the infalling matter, consuming up to a Suns worth of material every second and powering jets of matter that blasted outward to create the ...
We present new near-infrared (IR) observations of the Hβ λ4861 and Mg II λ2798 lines for 32 luminous quasars with 3.2 , z , 3.9 using the Palomar Hale 200 inch telescope and the Large Binocular Telescope. We find that the Mg II FWHM is well correlated with the Hβ FWHM, confirming itself as a good substitute for the Hβ FWHM in the black hole mass estimates. The continuum luminosity at 5100 Å well correlates with the continuum luminosity at 3000 Å and the broad emission line luminosities (Hβ and Mg II). With simultaneous near-IR spectroscopy of the Hβ and Mg II lines to exclude the influences of flux variability, we are able to evaluate the reliability of estimating black hole masses based on the Mg II line for high redshift quasars. With the reliable Hβ line based black hole mass and Eddington ratio estimates, we find that the z ∼ 3.5 quasars in our sample have black hole masses 1.90 × 10{sup 9} M {sub ☉} ≲ M {sub BH} ≲ 1.37 × 10{sup 10} M {sub ☉}, with a median of ∼5.14 ...
Eta Aquarid meteor shower. It takes place when the Earth crosses the famous Halleys Comet passage, causing the comets debris leftovers of to fall on the Earths surface.. If you set yourself up to watch the sky that night, you would not need any means of observation; the meteors would be visible to the naked eye. If you are located in the Southern Hemisphere, the Eta Aquarids would produce up to 60 meteors per hour. As for the Northern Hemisphere sky observers, including those observing the sky of the Arab Republic of Egypt, the rate can reach about 30 meteors per hour; a few good ones to observe.. Wednesday, 9 May 2018. On Wednesday, 9 May 2018, amateur astronomers and sky-observers will have an opportunity to observe another beautiful phenomenon known as Jupiter at Opposition. This phenomenon takes place when Jupiter lies directly opposite to the Sun, which means that it is in its utmost illumination condition. The planet will be visible also from Earth, and it is the best time to view and ...
Recent spectroscopic observations of the outer halo globular cluster (GC) NGC 2419 show that it is unique among GCs, in terms of chemical abundance patterns, and some suggest that it was originated in the nucleus of a dwarf galaxy. Here we show, from the Subaru narrowband photometry employing a calcium filter, that the red giant branch (RGB) of this GC is split into two distinct subpopulations. Comparison with spectroscopy has confirmed that the redder RGB stars in the hk[=(Ca-b) - (b - y)] index are enhanced in [Ca/H] by ∼0.2 dex compared to the bluer RGB stars. Our population model further indicates that the calcium-rich second generation stars are also enhanced in helium abundance by a large amount (ΔY = 0.19). Our photometry, together with the results for other massive GCs (e.g., ω Cen, M22, and NGC 1851), suggests that the discrete distribution of RGB stars in the hk index might be a universal characteristic of this growing group of peculiar GCs. The planned narrowband calcium ...
Where does this loving energy come from? Is it just inside of us or does to come to us from the outside and depending on our receptivity we either take it in or not? It is now really clear that the greatest source of energy in our galaxy exists at the center of the Milky Way. It is a black hole larger than several million of our Suns, yet it is compacted into a space about 10 times smaller than the Earths orbit around the sun. While Galactic Center emits energy all the time, there are certain times when it has its strongest effect on us, such as periods of time when our our Solar System is conjunct with the Black Hole at the center of our Milky Way Galaxy.. Every 250 million years, our galaxy makes one complete rotation and within that larger rotation our solar system is also rotating. Our Solar System actually exists on a remote arm of our Galaxy. but at about the mid-point of its 26,000 year rotation, it comes in direct alignment with Galactic Center. This Solar System Cycle has placed it ...
Up until now, though, that hasnt been a terribly urgent goal; the time-scale of galactic events is immense, usually so long that the average scientist quickly gives up on the idea of seeing the universes most dramatic displays within their lifetime. That attitude may change with respect to galactic supernovae now, thanks to this teams finding that the Milky Way is virtually certain to host a supernova within the next 50 years. Given those sorts of odds, the team argues, it would be silly not to start investing right away.. Though it is nearby within the context of the entire universe, even a galactic supernova is happening very, very far away; the probability of a supernova strong and close enough to be visible to the naked eye is closer to 1 in 5. The chance of a sky-brightening event that outshines all other objects in the sky, something like the incredible event observed by Kepler in 1604, is more like 1 in 20.. This sort of work can be difficult to justify to funding boards since it could ...
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We present near IR spectra (0.8-2.5 µm) of the two candidate B[e]/X-ray binary systems CI Cam/XTE J0421+560 and HD34921/1H 0521+37. The spectra of both systems show evidence for a more complex circumstellar environment than those seen in classical Be/X-ray binaries. Strong H I and He I emission is seen, confirming the presence of a dense circumstellar wind; O I, Fe II and [Fe II] emission in CI Cam points to recombination of this wind. He II emission, presumably due to excitation by the compact companion is observed in CI Cam. Finally, emission is seen from Na I and CO, which implies regions of the circumstellar environment with much lower excitation temperatures and higher densities, shielded from direct stellar radiation. Both systems show evidence for continuum emission from circumstellar dust. Neither of these two features has previously been observed in any other classical Be/X-ray binary system. Adopting the classification criteria of Lamers et al. (1998) we suggest identifications of ...
Considering all that was accomplished in the field of physics last year, it is exciting to think about what the new year will bring. If the Event Horizon Telescope actually allows for images of the black hole at the center of our universe, it will significantly impact scientists and the general public. Physicists doing related work may be able to more accurately predict the volume and mass of the black hole, or how long it will be before our solar system gets devoured. For the general public, specifically those who often question the authenticity of science for religious reasons or other causes, a tangible image of a black hole could give them hard evidence that black holes are in fact real, or even merely more appreciation for what scientists do. It is impossible to predict exactly what might get uncovered about the universe in the future or what effect it will bear, especially on a galactic level, but the more we understand, the more questions we have yet to answer ...
The luminosity of the tip of the red giant branch (TRGB) provides an excellent measure of galaxy distances and is easily determined in the resolved images of nearby galaxies observed with Hubble Space Telescope. There is now a large amount of archival data that are relevant to the TRGB methodology and offer comparisons with other distance estimators. Zero-point issues related to the TRGB distance scale are reviewed in this paper. Consideration is given to the metallicity dependence of the TRGB, the transformations between HST flight systems and Johnson-Cousins photometry, the absolute magnitude scale based on horizontal branch measurements, and the effects of reddening. The zero point of the TRGB is established with a statistical accuracy of 1%, modulo the uncertainty in the magnitude of the horizontal branch, with a typical rms uncertainty of 3% in individual galaxy distances at high Galactic latitude. The zero point is consistent with the Cepheid period-luminosity relation scale but invites
The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy.[1] Estimates of the length of one orbit range from 225 to 250 million terrestrial years.[2] The Solar System is traveling at an average speed of 828,000 km/h (230 km/s) or 514,000 mph (143 mi/s) within its trajectory around the galactic center,[3] a speed at which an object could circumnavigate the Earths equator in 2 minutes and 54 seconds; that speed corresponds to approximately one 1300th of the speed of light.. The galactic year provides a conveniently usable unit for depicting cosmic and geological time periods together. By contrast, a billion-year scale does not allow for useful discrimination between geologic events, and a million-year scale requires some rather large numbers.[4]. ...
A fleet of spacecraft including NASAs Hubble Space Telescope has uncovered unprecedented details in the surroundings of a supermassive black hole. Observations reveal huge bullets of gas being driven away from the gravitational monster and a corona of very hot gas hovering above the disk of matter that is falling into the black hole.. A team led by Jelle Kaastra of SRON Netherlands Institute for Space Research made use of data from ESAs XMM-Newton and INTEGRAL spacecraft (which study X-rays and gamma rays, respectively), the Hubble Space Telescope (for ultraviolet observations with the COS instrument), and NASAs Chandra (X-ray) Observatory and Swift (gamma-ray) satellites.. The black hole that the team chose to study lies at the heart of the galaxy Markarian 509 (Mrk 509), 500 million light-years away. This black hole is colossal, containing 300 million times the mass of the Sun, and is growing more massive every day as it continues to feed on surrounding matter, which glows brightly as it ...
A faint star in the Milky Way has been found to consist virtually only of hydrogen and helium. It has the lowest abundance of heavier elements ever observed, 20 times less than the previous record-holding star. This result is based on observations with the VLT telescope at the ESO Paranal Observatory. The discovery opens a new window towards the early times when the Milky Way galaxy was young, possibly still in the stage of formation.
The inner layers of the photosphere of an evolved star is one of many inhospitable places in the universe that we can neither visit nor see, because these are made up of a homogeneous, dense atomic cloud which, unlike the outer layers, are not penetrated by UV radiation. Thus, information of the chemical processes taking place there, at distances of around 1014 cm2 from the star, remains hidden to us. However, these regions are of fundamental importance as they can be regarded as cauldrons of chemical species, where dust and gas are ejected into space providing the building blocks of planets and the main ingredients required for the emergence of life. Many species are first formed in this zone, where individual atoms evolve into nanosized dust particles and complex molecules. So, we accepted the challenge of building a unique experimental machine based on ultra-high vacuum (UHV) technology to reproduce the physical conditions operating in the circumstellar envelope (CSE) in order to mimic, as ...
Gaia is measuring the distances of hundreds of millions of objects that are many thousands of light years away, at an accuracy equivalent to measuring the thickness of hair at a distance of more than 2000 kilometers. These data are one of the backbones of astrophysics, allowing us to forensically analyze our stellar neighborhood, and tackle crucial questions about the origin and future of our Milky Way Galaxy, says Floor van Leeuwen of the Institute of Astronomy at the University of Cambridge, about the most detailed ever catalog of the stars in a huge swathe of our Milky Way galaxy -the third early data release from the European Space Agencys Gaia Space Observatory launched in 2013 delivers data for just over 1.8 billion sources. Initial findings include the first optical measurement of the acceleration of the Solar systems orbit through the Milky Way.. The Gaia sweep includes stunning first ever images from Gaia data shown above of the Milky Ways satellite galaxies: the Large Magellanic ...
Unicoi State Park camping area visitors center. Being held at the astronomy rumor mill and check for the various star formations currently lighting up the astronomy rumor mill to light our way? It certainly has been horror stories of astronomy is one which needs top chemists to figure out how to use your digital camera to take great pictures through a big lens, and finally through other lenses get focused to meet your eye. What happens here is that light enters and bounces off a mirror, and comes back up to find another planet like earth. Not just for people with PhDs in planetary science or astrophysics. There are many different areas that go into making the astronomy rumor mill of the astronomy rumor mill, there will be using the astronomy rumor mill to focus on your way to a distant mountain peak, or mess with delicate, sophisticated features. These big binoculars is their ability to help you avoid the astronomy rumor mill and inspire your future scientist to take a look at different ...
Open Rank Tenure-Track Professor in Astronomy. Job No: 496796. Position Type: full-time. Location: Lewisburg, PA. Categories: Physics & Astronomy. The Department of Physics & Astronomy at Bucknell University invites applications for an open rank tenure-track faculty position in astronomy, to begin in the fall semester of 2022. The successful candidate will demonstrate their potential (1) to teach at all levels of the undergraduate physics curriculum, particularly introductory and advanced courses in astronomy and astrophysics; and (2) to establish and maintain an active research program in astronomy. Applicants are required to have a Ph.D. in physics, astronomy, or the equivalent.. A complete application will include a curriculum vitae or resume, a statement that describes the applicants experience and potential as a teacher, a statement describing their scholarly interests, a statement that describes their experience and expertise in inclusive pedagogy and teaching a diverse array of students, ...
Published today in the journal Nature, the research shows jets from V404 Cygnis black hole behaving in a way never seen before on such short timescales.. The jets appear to be rapidly rotating with high-speed clouds of plasma-potentially just minutes apart-shooting out of the black hole in different directions.. Lead author Associate Professor James Miller-Jones, from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR), said black holes are some of the most extreme objects in the Universe.. This is one of the most extraordinary black hole systems Ive ever come across, Associate Professor Miller-Jones said.. Like many black holes, its feeding on a nearby star, pulling gas away from the star and forming a disk of material that encircles the black hole and spirals towards it under gravity.. Whats different in V404 Cygni is that we think the disk of material and the black hole are misaligned.. This appears to be causing the inner part of the disk to ...
Ask an Astronomer is run by volunteers in the Astronomy Department at Cornell University. We answer your astronomy questions. Please browse our archive first.
A team of astronomers led by Carnegies Eduardo Bañados used Carnegies Magellan telescopes to discover the most-distant supermassive black hole ever observed. It resides in a luminous quasar and its light reaches us from when the Universe was only 5 percent of its current age - just 690 million years after the Big Bang.. Their findings are published by Nature.. Quasars are tremendously bright objects comprised of enormous black holes accreting matter at the centers of massive galaxies. This newly discovered black hole has a mass that is 800 million times the mass of our Sun.. Gathering all this mass in fewer than 690 million years is an enormous challenge for theories of supermassive black hole growth, Bañados explained.. To grow black holes that big so soon after the Big Bang, astronomers have speculated that the very early Universe might have had conditions allowing the creation of very large black holes with masses reaching 100,000 times the mass of the Sun. This is very unlike the black ...
Picture above, you can see the disk shape galaxy NGC 1277 that was captured by the Hubble Space Telescope. At the center of this galaxy is the black hole that scientists are saying accounts for 14% of the galaxys weight. To put the size of this black hole in perspective, our own milky way galaxy has a black hole equivalent to the mass of 4 million suns. NGC 1277 has the mass of 17 billion suns!. It has typically been thought that the mass of a galaxies black hole correlates to the mass of the stars in a galaxy. After this discovery however, it seems that theory may not be true. The ratio of this black hole to the mass of the stars in its galaxy are way off the typical charts. Small disk shaped galaxies typically have much smaller black holes that usually account for less than 1% of their mass. Finding one that accounts for 14% of its mass is truly rare. Black holes of this size are usually found elliptical galaxies.. It appears after further examination that this phenomenon isnt as rare as ...
The objects studied involve stars, galaxies, planets, moons, asteroids, comets and nebulae. Phenomena outside the Earths atmosphere are also examined. That features supernovae explosions, gamma ray bursts, and cosmic microwave track record radiation. Astronomy considerations the event, physics, chemistry, meteorology and motion of celestial bodies, as well as the composition and enhancement belonging to the Universe.. Astronomy has become the oldest sciences. Ancient individuals utilised the positions in the stars to navigate, and to find when was the perfect the perfect time to plant crops. Astronomy is really just like astrophysics. A correlated subject, cosmology, is worried with studying the Universe being a whole, together with the way the universe adjusted over time. Astronomy isnt the exact same as astrology, the assumption that motion of your stars and then the planets may very well have an effect on human lives.. Since the 20th century there have actually been two important styles of ...
The 2011 X-ray Astronomy School, organized jointly by HEASARC at NASA Goddard Space Flight Center and the Chandra X-ray Center, is designed to introduce graduate students and recent postdocs to the intricacies of X-ray astronomy. There are currently five operating X-ray satellites - Chandra, RXTE, Swift, Suzaku, and XMM-Newton - in addition to the online archives from earlier missions. X-ray astronomy is thus an important resource for research in many topics in astrophysics. However, many astronomers have never analyzed X-ray data and do not have a clear idea of the methods and challenges involved. The lectures emphasize the foundations of X-ray astronomy rather than any particular software tools. However, the school does include a hands-on component in which participants will analyze an X-ray dataset of their choice using the standard software. By attending the X-ray Astronomy School, students will have the opportunity to learn from scientists who are actively participating in X-ray research ...
NOAO is the national center for ground-based nighttime astronomy in the United States and is operated by the Association of Universities for Research in Astronomy (AURA). under cooperative agreement with the National Science Foundation. If you would like information about solar astronomy, visit the National Solar Observatory. If you would like information about radio astronomy, visit the National Radio Astronomy Observatory.. ...
The Department of Physics & Astronomy at the University of Toledo invites applications for a postdoctoral position in observational astronomy. The selected applicant will work with Prof. Marc Seigar on topics related to structure and dynamics of nearby galaxies. Potential research areas include morphology of disk galaxies, star formation in disk galaxies, and/or structure and stellar content of nonbarred ringed galaxies. A competitive salary will be provided and funding is available for travel to scientific conferences. There may also be opportunities to co-advise graduate and/or undergraduate student research. The position will start as soon as possible but by August 2022 at the latest and will continue for up to three years contingent upon satisfactory performance.. The astronomy program at the University of Toledo has 9 faculty, 4 postdocs, and 14 graduate students who maintain a vigorous program of research and public outreach. The Department of Physics and Astronomy is home to the Ritter ...
At the middle of a black hole, there is a gravitational center called a singularity. It is impossible to see into it because the gravity prevents any light escaping. Around the tiny singularity, there is a large area where light which would normally pass by gets sucked in as well. The edge of this area is called the event horizon. The area beyond the event horizon is the black hole. The gravity of the black hole gets weaker at a distance. The event horizon is the place farthest away from the middle where the gravity is still strong enough to trap light. Outside the event horizon, light and matter will still be pulled toward the black hole. If a black hole is surrounded by matter, the matter will form an accretion disk (accretion means gathering) around the black hole. An accretion disk looks something like the rings of Saturn. As it gets sucked in, the matter gets very hot and shoots x-ray radiation into space. Think of this as the water spinning around the hole before it falls in. Most ...
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A number of significant scientific events occurred in 2013, including the discovery of numerous Earthlike exoplanets, the development of viable lab-grown ears, teeth, livers and blood vessels, and the atmospheric entry of the most destructive meteor since 1908. The year also saw successful new treatments for diseases such as HIV, Usher syndrome and leukodystrophy, and a major expansion in the use and capabilities of technologies such as 3D printing and autonomous cars. The United Nations designated 2013 the International Year of Water Cooperation. 2 January A study by Caltech astronomers reports that the Milky Way Galaxy contains at least one planet per star, resulting in approximately 100-400 billion exoplanets. The study, based on planets orbiting the star Kepler-32, suggests that planetary systems may be the norm around stars in our galaxy. Astronomers report the discovery of giant geysers of charged particles emanating from the core of the Milky Way Galaxy. These outflows, which extend as ...
Sophomore Deanna OConnell observes the stars and planets using one of Jeters various telescopes. Photo by Kaleela Rosenthal On Tuesday, Sept. 24 at 8 p.m., the Marjory Stoneman Douglas High School Astronomy Club hosted its first astronomy night at Marjorys Garden. Club members and their friends were invited to a night studying the stars. Astronomy...
Students majoring in Astronomy acquire a wide range of skills, from the use of spectroscopic and photometric detector systems (and the analysis of the data obtained), through electronics and optics, to computer skills for analysis and interpretation of data. This produces a graduate who is well equipped to undertake employment not only in astronomy, but in any number of fields that require practical experience or that involve analysis of real data.. Studying Physics and Astronomy equips graduates with skills in problem solving, abstract thinking, evaluating, communicating, and decision making. It develops high levels of curiosity, inventiveness, and mathematical and computer competencies.. Graduates may follow traditional paths and work either as scientists, technicians, research assistants, engineers, astronomers, patent agents, technical authors, or even managers at an observatory or in an institute. However, many Astronomy graduates move into other fields, particularly computing and ...
Ricardo (Ricky) Adams and Zenobia (Zee) Rinquest approached Auke, Lynnette and I to join them for a public astronomy outreach in celebration of Global Astronomy Month 2015 which you can read more about here. They had a venue all planned and were looking for fellow astronomy enthusiasts to enjoy the outing with them. Ricky was associated with the Iziko Planetarium for a long time and when he spoke to Theo Ferreira the MMWC at the Planetarium, Theo was kind enough to recommend us and also to arrange for support in the form of the Iziko bus with the three museum stalwarts, Temba Matomele, Sthembele Harmans and Luzuko Dalasile. You can read more about the Iziko outreach program here.. ...
Synonyms for Antennae (astronomy) in Free Thesaurus. Antonyms for Antennae (astronomy). 6 synonyms for antenna: aerial, sensor, transmitting aerial, aerial, feeler, feeler. What are synonyms for Antennae (astronomy)?
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Databases Meet Astronomy a db view of astronomy data. Jim Gray Microsoft Research Collaborating with: Alex Szalay, Peter Kunszt, Ani Thakar @ JHU Robert Brunner, Roy Williams @ Caltech George Djorgovski, Julian Bunn @ Caltech. Outline. Astronomy data The Virtual Observatory Concept Slideshow 1344900 by bernad
For all mid-sized stars the evolutionary scenario is similar with some exceptions. Stars slightly smaller than our Sun also evolve into red giants but their cores dont have enough mass to ignite helium fusion. They dont reach the tip of the red giant branch shown above, and there is no helium flash. Instead, these stars move directly into a state that more resembles the post- AGB (asymptotic giant branch) top horizontal line in the graph above, except that they are less luminous. Like the Sun, they eventually blow off their outer layers to form a planetary nebula, leaving behind, in this case, a helium white dwarf. In stars more massive than our Sun, between 2.25 M and 10 M, the core is large enough and dense enough to reach the fusion ignition temperature of helium before it has a chance to contract into a degenerate state. This eliminates the helium flash from their life cycle for a different reason. Like the Sun, these more massive stars expand into red giants as the outer layers of the ...
I want to draw attention to a supernova impostor that has flared back up, and some are saying it could have gone supernova. Here is a link to the relevant Astronomers Telegram:. http://www.astronomerstelegram.org/?read=4412. Supernova imposters are visually as bright as supernova but they do not destroy the progenitor and some of them, like SN 2009ip have a repeat eruption. As the ATEL reports, Nathan Smith has guessed that this one might have popped off as a true supernova this time. Eta Carinaes great eruption in the 1840s is the prototype for this kind of object in our own galaxy.. Observing this object is a stretch for most northern hemisphere observers because it is at Declination -29. However it is an object of great interest and any good CCD photometry would be appreciated. Johnson V is normally most helpful. Cousins R and I are also useful for supernova impostors (because dust production can make them redder as they evolve).. Here is a link to photo on flicker with the object ...
Astronomers have uncovered a near-record-breaking supermassive black hole, weighing 17 billion suns, in an unlikely place: in the center of a galaxy in a sparsely populated area of the universe.. The observations, made by NASAs Hubble Space Telescope and the Gemini telescope in Hawaii, could indicate that these monster objects may be more common than once thought.. Until now, the biggest supermassive black holes those roughly 10 billion times the mass of our sun have been found at the cores of very large galaxies in regions of the universe packed with other large galaxies. In fact, the current record holder tips the scale at 21 billion suns and resides in the crowded Coma galaxy cluster, which consists of over 1,000 galaxies.. The newly discovered supersized black hole resides in the center of a massive elliptical galaxy, NGC 1600, located in a cosmic backwater, a small grouping of 20 or so galaxies, said lead discoverer Chung-Pei Ma, a University of California-Berkeley astronomer and head of ...
Among those to take a closer look at the object was a team of astronomers from the Universities of Erlangen-Nürnberg and Potsdam. They discovered that it may not necessarily be a black hole at all, but possibly a massive neutron star or even an ordinary star. Their results have now been published as a highlight-paper in the renowned journal Astronomy & Astrophysics.. The putative black hole was detected indirectly from the motion of a bright companion star, orbiting an invisible compact object over a period of about 80 days. From new observations, a Belgian team showed that the original measurements were misinterpreted and that the mass of the black hole is, in fact, very uncertain. The most important question, namely how the observed binary system was created, remains unanswered. A crucial aspect is the mass of the visible companion, the hot star LS V+22 25. The more massive this star is, the more massive the black hole has to be to induce the observed motion of the bright star. The latter ...
Water is the medium in which the chemistry of all life on Earth takes place. The NAI UH Team will focus on scenarios involving the sources and distribution of water in planetary systems and the delivery and incorporation of water into rocky habitable planets. The team will investigate:. The Origin of Earths Water - Constraining the origin of Earths water by better characterizing the D/H ratio of the primitive mantle. D/H in the Interstellar Medium, Disks and the Solar System - Determining the relationship of the highly deuterium-enriched circumstellar envelope material with the planet-forming disks in these systems, and investigating the evolution of D/H in a mature planetary system through observations of comets and models of ice fractionation processes. Ice Chemistry in the Solar System - Investigating the processing of primitive Solar system material and ices by energetic particles that leads to lifes precursor molecules. The Main Belt Comets - Surveying the sky for Main Belt Comets, a new ...
ADC_Keywords: Infrared sources ; Stars, late-type ; Stars, pre-main sequence Keywords: stars: formation - stars: late-type - stars: pre-main sequence - infrared: stars Abstract: We search for new T Tauri star (TTS) candidates with the mid-infrared (MIR) part of the AKARI All-Sky Survey at 9 and 18µm wavelengths. We used the point source catalogue (PSC) obtained by the Infrared Camera (IRC) on board AKARI. We combined the 2MASS PSC and the 3rd version of the USNO CCD Astrograph Catalogue (UCAC) with the AKARI IRC-PSC, and surveyed 517 known TTSs over a 1800-square-degree part of the Taurus-Auriga region to develop criteria to extract TTSs. We considered asymptotic giant branch (AGB) stars, post-AGB stars, planetary nebulae (PNe), and galaxies, which have similar MIR colours, to separate TTSs from these sources. We finally searched for new TTS candidates from AKARI IRC-PSC in the same Taurus-Auriga region. Of the 517 known TTSs, we detected 133 sources with AKARI: 46 sources were not detected by ...
Smadar Naoz is an associate professor of physics and astronomy in the UCLA College. She wrote this article for The Conversation.. Do supermassive black holes have friends? The nature of galaxy formation suggests that the answer is yes, and in fact, pairs of supermassive black holes should be common in the universe.. I am an astrophysicist and am interested in a wide range of theoretical problems in astrophysics, from the formation of the very first galaxies to the gravitational interactions of black holes, stars and even planets. Black holes are intriguing systems, and supermassive black holes and the dense stellar environments that surround them represent one of the most extreme places in our universe.. The supermassive black hole that lurks at the center of our galaxy, called Sgr A*, has a mass of about 4 million times that of our sun. A black hole is a place in space where gravity is so strong that neither particles or light can escape from it. Surrounding Sgr A* is a dense cluster of stars. ...
in Astronomy and Astrophysics (2008), 487. Aims. We aim at directly detecting the presence of optically thin circumstellar dust emission within the terrestrial planetary zone around main sequence stars known to harbour cold debris discs. The ... [more ▼]. Aims. We aim at directly detecting the presence of optically thin circumstellar dust emission within the terrestrial planetary zone around main sequence stars known to harbour cold debris discs. The present study focuses on a sample of six bright A- and early F-type stars. Methods: High-precision interferometric observations have been obtained in the near-infrared K band with the FLUOR instrument installed on the CHARA Array. The measured squared visibilities are compared to the expected visibility of the stellar photospheres based on theoretical photospheric models taking into account rotational distortion. We search for potential visibility reduction at short baselines, a direct piece of evidence for resolved circumstellar emission. ...
TY - JOUR. T1 - Stability of silicon and titanium carbide suspensions in electrolyte, poly(ethylene oxide), and PEO-surfactant solutions. AU - Bárány, S.. AU - Eremenko, Boris V.. AU - Malysheva, Mariya L.. PY - 2004/7/1. Y1 - 2004/7/1. N2 - It has been shown that the coagulation values of counterions for SiC and TiC suspensions with particle radius from 0.5 to 5 μm obey a z 2.5-3.5 law and there is an insufficient change in the critical concentration of 1-1 electrolytes (CCE) when the surface potential of particles increases more than two times. Also, the CCE values hardly depend on the position of counterions in the lyotropic sequence. This is explained by aggregation of SiC and TiC particles at a secondary minimum, which is proved by calculations of the potential curves of interparticle interactions using the DLVO theory. The adsorption of poly(ethylene oxide) on the surfaces studied does not cause - in contradiction to dispersions with smaller particles - an unlimited growth in the ...
Cambridge, MA - Scientists at the Center for Astrophysics , Harvard & Smithsonian today announced the discovery and study of the brightest, most energetic, and likely most massive supernova ever identified.. SN2016aps is believed to be an example of a pulsational pair instability supernova, and may have formed as the result of the merging of two massive stars prior to the explosion. The explosion energy of SN2016aps was ten times that of a normal-sized supernova.. SN2016aps is spectacular in several ways, said Edo Berger, Harvard University professor and co-author on the paper. Not only is it brighter than any other supernova weve ever seen, but it has several properties and features that make it rare in comparison to other explosions of stars in the universe.. The team-made up of researchers from CfA, University of Birmingham, Northwestern University, and Ohio University-first identified the supernova in 2016 using data from the Panoramic Survey Telescopes and Rapid Response System ...
The History and Practice of Ancient Astronomy combines new scholarship with hands-on science to bring readers into direct contact with the work of ancient astronomers. While tracing ideas from ancient Babylon to sixteenth-century Europe, the book places its greatest emphasis on the Greek period, when astronomers developed the geometric and philosophical ideas that have determined the subsequent character of Western astronomy. The author approaches this history through the concrete details of ancient astronomical practice. Carefully organized and generously illustrated, the book can teach readers how to do real astronomy using the methods of ancient astronomers. For example, readers will learn to predict the next retrograde motion of Jupiter using either the arithmetical methods of the Babylonians or the geometric methods of Ptolemy. They will learn how to use an astrolabe and how to design sundials using Greek and Roman techniques. The book also contains supplementary exercises and patterns for making
CHILEAN MINISTER FOR WOMENS AFFAIRS ENCOURAGES GENDER EQUALITY IN SCIENCE, ENGINEERING, TECHNOLOGY AND MATHEMATICS The Minister for Womens Affairs and Gender Equality will shortly inaugurate a workshop on gender equality in astronomy and related engineering disciplines. The event seeks to raise awareness of the current state of inclusion and retention of women in these areas, as well as analyze existing challenges and opportunities. Chilean and foreign participants will discuss best practices, while a group of female astronomers and engineers will share their experiences to encourage scientific vocations amongst young students. The Atacama Large Millimeter/submillimeter Array (ALMA) and Associated Universities, Inc. (AUI)/National Radio Astronomy Observatory (NRAO) are organizing the Women in Astronomy and Engineering Workshop within the framework of the 27th International Conference on Astronomical Data Analysis Software and Systems (ADASS). The event will take place on Thursday, October ...
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A giant bubble surrounding the centre of the Milky Way shows that six million years ago our Galaxys supermassive black hole was ablaze with furious energy. It also shines a light on the hiding place of the Galaxys so-called missing matter. A giant bubble surrounding the centre of the Milky Way shows that six million years ago our Galaxys supermassive black hole was ablaze with furious energy. It also shines a light on the hiding...
The Hubble Space Telescope, which had been programmed to search for planets, has found 42 oddball blue stars in the Milky Way galaxy. These stars burn so brightly that they consume their fuel much faster than other stars. Though they are found in more abundance in more distant galaxies, the discovery of nearby blue stars presents a particular problem for standard long-age cosmologies.. Blue stars should not exist in a universe that is 13.7 billion years old, because they should have burned out billions of years ago. University of South Carolina astronomer Danny Faulkner recently noted, In fact, the hottest blue stars could last only a few million years at best. Both creationists and evolutionists acknowledge this fact. Thus, evolutionists have proposed that these stars have been constantly generated during this long time span. But that means blue stars should be forming even now. Despite their diligent search, however, [astronomers] have never observed one of these blue stars forming-or any ...
Astronomy and physics education research and comments, field-tested think-pair-share (peer instruction) clicker questions, flashcard questions, in-class activities (lecture-tutorials), current events questions, backwards faded scaffolding laboratories, Hake gains, field-tested multiple-choice and essay exam questions, indices of discrimination, presentation slides, photos, ephemerae, astronomy in the marketplace, unrelated random sketches and minutiae.. ...
Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing, telescopes, NASA, Hubble, space missions, stargazing, and more
Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing, telescopes, NASA, Hubble, space missions, stargazing, and more
"Astronomical Phenomena". In Urban, S.E.; Seidelmann, P. K. (eds.). Explanatory supplement to the astronomical almanac (3rd ed ... This phenomenon occurs once every 14.7 years on average, and can last a few weeks before and after the exact equinox. Saturn's ... The effect of a larger dip on taller objects (reaching over 2½° of arc on Everest) accounts for the phenomenon of snow on a ... Prior to the 1980s there was no generally accepted term for the phenomenon, and the word "equilux" was more commonly used as a ...
In many cases astronomical phenomena viewed from the planet Mars are the same or similar to those seen from Earth but sometimes ... "Astronomical Phenomena From Mars". Archived from the original on 2008-06-02. Retrieved 2005-04-23. 1990A&A...233..235B Page 235 ... The phenomenon of libration occurs for Phobos as it does for Earth's Moon, despite the low inclination and eccentricity of ... They would probably also be invisible to the human eye, being largely ultraviolet phenomena. The orientation of Mars's axis is ...
Some of the astronomical phenomena of interest to astronomers are eclipses, apparent retrograde motion/planetary stations, ... The astronomical position calculated from an ephemeris is given in the spherical polar coordinate system of right ascension and ... Meeus, Jean (1991). Astronomical Algorithms. Willmann-Bell. ISBN 0-943396-35-2. Michelsen, Neil F. (1990). Tables of Planetary ... Georgij A. Krasinsky and Victor A. Brumberg, Secular Increase of Astronomical Unit from Analysis of the Major Planet Motions, ...
Astronomical Phenomena that Influenced the Compilation of Anno Domini. The Inspiration of Astronomical Phenomena. Volume 441. ... This New Age phenomenon is seen by some astrologers to be marked by the conjunction of the planet Uranus, ruler of the sign ... All ancient astronomical observations were based on visual techniques. Of all the key techniques used in ancient times, the ... It is possible that some other astronomers before Hipparchus had also noticed the phenomenon, but it is Hipparchus who is ...
She was a member of the International Astronomical Union, the American Astronomical Society, the American Geophysical Union, ... She worked at Goddard Space Flight Center in Maryland for most of her career, and compiled the Lunar Transient Phenomena (LTP) ... "Astronomical League Convention Boasts NASA Officials as Speakers". York Daily Record. June 8, 1972. p. 15. Retrieved May 26, ... She compiled the Lunar Transient Phenomena (LTP) database, still in use. She was astronomer-on-base at Cape Canaveral during ...
The Inspiration of Astronomical Phenomena Vi. 441: 205. Bibcode:2011ASPC..441..205O. Retrieved 2016-09-06.. ...
Lord Kan II used the dates of important astronomical phenomena for these. For example: 9.5.19.1.2 9 Ik 5 Uo - April 14, 553, ... Maya astronomy is the study of the Moon, planets, Milky Way, Sun, and astronomical phenomena by the Precolumbian Maya ... The Classic Maya understood many astronomical phenomena: for example, their estimate of the length of the synodic month was ... Astronomical calculations return a year zero and years before that are negative numbers. This is astronomical dating. There is ...
Symposium, International Astronomical Union (2000). The Carbon Star Phenomenon. Springer Science & Business Media. pp. xxvi- ... "Nüzhet Gökdoğan". International Astronomical Union. Retrieved 2020-10-17. "Turkish Women Delegates to Astronomical Conference ... Gökdoğan was a member of the International Astronomical Union (IAU), and as of 1961 she became the first national ... She was Turkey's first national representative at the International Astronomical Union (IAU), and has been credited as Turkey's ...
Maby was a Fellow of the Royal Astronomical Society. He was a member of the British Society of Dowsers and Society for ... 1988). Occult and Supernatural Phenomena. Dover Publications. p. 358. ISBN 0-486-25551-4 "Monthly Notices of the Royal ... Journal of the British Astronomical Association 45: 165-166. Maby, C. (1936). Micellar Structure of the Tracheide Wall in ... Astronomical Society". May 8, 1925. Maby, Joseph Cecil in libraries (WorldCat catalog) v t e. ...
It also contains observations of other astronomical phenomena. It was the largest and most complete star catalog of its day. ... This publication is a collection of several books of astronomical recordings taken over the previous decade at the observatory ...
Inspiration of Astronomical Phenomena VIII: City of Stars. 501: 265. Bibcode:2016ASPC..501..265V. ISSN 1050-3390. Editors, ... No astronomical basis for this count has been proved, and it may be that the 260-day count is based on the human gestation ... The set of traits shared by Mesoamerican cultures also included astronomical knowledge, blood and human sacrifice, and a ... Illustrations in the codices show that priests made astronomical observations using the naked eye, assisted by crossed sticks ...
ISBN 978-0-460-04535-3 Is Life an Astronomical Phenomenon? (University College Cardiff Press, 1982) ISBN 9780906449493 Why Neo- ... Hoyle, Fred (1999). Astronomical Origins of Life; Steps Towards Panspermia. Kluwer Academic Press. ISBN 978-0-7923-6081-0. " ... Hoyle, Fred (2000). Astronomical Origins of Life: Steps towards Panspermia. Dordrecht: Kluwer Academic Press. Wickramasinghe, ... The case for life as a cosmic phenomenon, Nature 322, 509-511 Hoyle, F. and Wickramasinghe, N.C., 1990. Influenza - evidence ...
ISBN 90-277-0885-1. Harrington, R.S. (1970). "Encounter Phenomena in Triple Stars". Astronomical Journal. 75: 114-118. Bibcode: ... Gregg, T. A.; Prsa, A.; Welsh, W. F.; Orosz, J. A.; Fetherolf, T. (2013). "A Syzygy of KIC 4150611". American Astronomical ... During the 24th General Assembly of the International Astronomical Union in 2000, the WMC scheme was endorsed and it was ... Does triple star orbit directly affect orbit time[dead link], Jeremy Hien, Jon Shewarts, Astronomical News 132, No. 6 (November ...
Proceedings of the 193rd Symposium of the International Astronomical Union. San Francisco: Astronomical Society of the Pacific ... Van Der Hucht, Karel A.; Koenigsberger, Gloria; Eenens, Philippe R. J. (1999). "Wolf-Rayet Phenomena in Massive Stars and ... and a member of the International Astronomical Union (IAU). She served on the Board of Directors of the Association of ... "Gloria Koenigsberger". International Astronomical Union. December 6, 2017. Retrieved May 29, 2019. "Governance Directory". ...
Nevill was elected a fellow of the Royal Astronomical Society (RAS) under the name Edmund Neison, 'having the curious idea that ... Also weather observations, time service, comets and 'temporary phenomena'. Staff included Nevill, assistant, and later 'four ... Spencer Jones, H. (1941). "Obituary Notices: Fellows:- Nevill, Edmund Neville". Monthly Notices of the Royal Astronomical ... ladies were added as astronomical computers'. Nevill published a major paper on corrections to Hansen's Tables - using 1500 ...
Athay, R. Grant; Moreton, Gail E. (1961). "Impulsive Phenomena of the Solar Atmosphere. I. Some Optical Events Associated with ... Moreton, G. E. (1960). "Hα Observations of Flare-Initiated Disturbances with Velocities ~1000 km/sec". Astronomical Journal. 65 ... Moreton, G. E. & Ramsey, H. E. (1960). "Recent Observations of Dynamical Phenomena Associated with Solar Flares". Publications ... Sakurai, Takashi (3 September 2002). "SolarNews Newsletter". Solar Physics Division, American Astronomical Society. Archived ...
Engaging the Heavens: Inspiration of Astronomical Phenomena V. 468. Adler Planetarium, Chicago, Illinois, USA: Astronomical ... Sun Circle uses astronomical alignments to cast shadows and light through apertures (windows) to align with corresponding ...
523 Specific celestial bodies & phenomena. *524 Not assigned or no longer used ... 525 Earth (Astronomical geography). *526 Mathematical geography. *527 Celestial navigation. *528 Ephemerides ...
Babylonian astronomers had developed arithmetical techniques for calculating astronomical phenomena; Greek astronomers such as ... Ptolemy presented his astronomical models in convenient tables, which could be used to compute the future or past position of ... Ptolemy wrote in ancient Greek and can be shown to have utilized Babylonian astronomical data. He might have been a Roman ... Ptolemy's Handy Tables provided the model for later astronomical tables or zījes. In the Phaseis (Risings of the Fixed Stars), ...
The subjects of the evergreen segments focused on astronomical phenomena; while, the subjects of regular weekly episodes ... The show educates viewers about astronomical events for the coming week and about astronomy and astronomical history in general ... When astronomical events were in the news, Horkheimer would speak of them, giving viewers much more detailed information. When ... On the weekly program, the host informs the viewer of significant astronomical events for the upcoming week, including key ...
... 's observatory is a useful place to see astronomical phenomena. San Isidro Festivals: in spring, the week of 15 May. San ...
The texts describing the relevant astronomical phenomena are extremely obscure. For example, the inscription on the Li gui, a ... Occasionally an unusual astronomical event was recorded. A key reference point was the accession of King Yi of Zhou, when ... A few documents relate astronomical observations to this event: A quotation in the Book of Han from the lost Wǔchéng 武成 chapter ... The only date within that range matching all the astronomical data is 20 January 1046 BC. This date had previously been ...
The data is based on astronomical phenomena and is predictable. Sustained storm-force winds blowing from one direction combined ...
The projections are astronomical phenomena, not signals from the inhabitants. Mars is doubtless inhabited by a superior race, ... She made endowments to the Paris Observatory, the Astronomical Society of the Pacific, and the University of California to be ... Asteroids 339 Dorothea and 1040 Klumpkea were named in her honor, as is the Klumpke-Roberts Award of the Astronomical Society ... Through a donation of Dorothea in honor of her late husband, the Société astronomique de France (the French Astronomical ...
The texts describing the relevant astronomical phenomena are extremely obscure. For example, the inscription on the Li gui, a ... A few documents relate astronomical observations to this event: A quotation in the Book of Han from the lost Wǔchéng 武成 chapter ... The only date within that range matching all the astronomical data is 20 January 1046 BC. This date had previously been ... Liu, Ci-Yuan (2002), "Astronomy in the Xia-Shang-Zhou Chronology Project", Journal of Astronomical History and Heritage, 5 (1 ...
McRae, Mike (24 April 2017). "Introducing Steve - a Newly Discovered Astronomical Phenomenon". ScienceAlert. "Swarm probes ... In April 2017, Swarm's data was used to confirm that Steve was a previously unrecognized atmospheric phenomenon. In May 2020, ...
A blue moon is an astronomical phenomenon. Blue Moon may also refer to: "Blue Moon" (1934 song), by Richard Rodgers and Lorenz ... an astronomical phenomenon caused by the 1883 eruption of Krakatoa All pages with titles beginning with Blue Moon Once in a ...
Udalski, A. (July 1990). "SU Ursae Majoris: The Perfect Prototype of SU UMa Subclass of Dwarf Novae". Astronomical Journal. 100 ... van Paradijs, J. (September 1983). "Superoutburst : a general phenomenon in dwarf novae". Astronomy and Astrophysics. 125: L16- ... October 2012). "Discovery of Superhumps during a Normal Outburst of SU Ursae Majoris". Publications of the Astronomical Society ... Isles, J. E. (1974). "SU UMa, 1926-54". Journal of the British Astronomical Association. 84: 365-373. Bibcode:1974JBAA...84.. ...
The secondary is smaller, of spectral type A, and orbits Achernar at a distance of roughly 12 astronomical units (AU). α ... Moujtahid, A.; Zorec, J. (2000). "The Visual Absolute Magnitude of the Central Objects in Be Stars". The be Phenomenon in Early ... University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E. ... Journal of Astronomical History & Heritage. 13 (3): 220-34. arXiv:1010.4610. Bibcode:2010JAHH...13..220H. "Flattest Star Ever ...
A very remarkable phenomenon." NGC 2392 WH IV-45 is included in the Astronomical League's Herschel 400 observing program. NGC ... 2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329-3347. Bibcode:2002AJ....123.3329O. doi: ... and SIMBAD Astronomical Database (CDS) discontinued use of three nicknames that were perceived as offensive - "Eskimo Nebula ...
Monthly Notices of the Royal Astronomical Society,volume=7,pages=145-149,datum=13.11.1846,izdavač=Blackwell Publishing}},/ref, ... Journal of Electron Spectroscopy and Related Phenomena,volume=101-103,page=233}},/ref, ... Monthly Notices of the Royal Astronomical Society; Blackwell Publishing,volume=7,page=149,date=13.11.1846}},/ref, ...
Bernal, M. J. M.; Massey, H. S. W. (3 February 1954). "Metallic Ammonium". Monthly Notices of the Royal Astronomical Society. ... and electron correlative contributing phenomena.[161] While analogous lithium bonds are also known, they are mostly ... Wiley-Blackwell for the Royal Astronomical Society. 114 (2): 172-179. Bibcode:1954MNRAS.114..172B. doi:10.1093/mnras/114.2.172. ... "On some new phenomena of chemical changes produced by electricity, in particular the decomposition of the fixed alkalies, and ...
Swerdlow, Noel M. (1998). [Periodicity and Variability of Synodic Phenomenon Periodicity and Variability of Synodic Phenomenon ... Meeus, J.; Goffin, E. (April 1983). "Transits of Earth as seen from Mars". Journal of the British Astronomical Association 93 ( ... Novakovic, B. (October 2008). "Senenmut: An Ancient Egyptian Astronomer". Publications of the Astronomical Observatory of ... Quarterly Journal of the Royal Astronomical Society, Quarterly Journal 19: 90-109. ബിബ്‌കോഡ്:1978QJRAS..19...90H. Unknown ...
Maxwell proposed that light is an undulation in the same medium that is the cause of electric and magnetic phenomena.[6] The ... The James Clerk Maxwell Telescope, the largest submillimetre-wavelength astronomical telescope in the world, with a diameter of ... a phenomenon that had been discovered by Faraday and is now known as the Faraday effect.[68] ... and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism have been called the " ...
"Publications of the Astronomical Society of the Pacific. 100: 6. Bibcode:1988PASP..100....6C. doi:10.1086/132128.. ... Ultraviolet and X-ray telescopes can observe highly energetic galactic phenomena. Ultraviolet flares are sometimes observed ... "Astronomical Society of the Pacific. Retrieved January 16, 2007.. *^ "Cosmic 'Murder Mystery' Solved: Galaxies Are 'Strangled ... "Journal of the Royal Astronomical Society of Canada. 83 (6): 351-362. Bibcode:1989JRASC..83..351S. Retrieved January 8, 2007.. ...
The August 1993 cover of Vanity Fair that marked the arrival of lesbian chic as a social phenomenon in the 1990s. ... Symbol representing lesbian made from two interlocked astronomical symbols for the planet Venus. In biology, the singular ... The focus of this debate often centers on a phenomenon named by sexologist Pepper Schwartz in 1983. Schwartz found that long- ... Faderman, Lillian (April 1992). "The Return of Butch and Femme: A Phenomenon in Lesbian Sexuality in the 1980s and 1990s", ...
Several structures and phenomena in anatomy and physiology are named for him, including the Golgi apparatus, the Golgi tendon ... He was a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and ... "for their discoveries regarding tunnelling phenomena in solids". Giaever is an institute professor emeritus at the Rensselaer ... "in recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered ...
The same phenomenon, with the same reason underlying, is to be found in the Church Fathers. And so we have, hammo-chrysos, hady ... The Latin names are international, easily checked on any serious astronomical site, and I think all our pages agree with them ... Not sure I do either, but as long as it's linked to phaenomenon to show that it's not a noumenon, it's probably OK. Cantius ... One of the reasons I didn't provide "phaenomenon" with an internal nexus was that I wanted to hold to everyday use (like in the ...
A candidate explanation for this phenomenon must allow the Sakharov conditions to be satisfied at some time after the end of ... The most distant astronomical objects observable with telescopes date to this period; as of 2016, the most remote galaxy ... These phase transitions are believed to be caused by a phenomenon of quantum fields called "symmetry breaking". Forces and ... See also: Hydrogen line and List of the most distant astronomical objects ...
minute, hour, day, degree of arc, minute of arc, second of arc, hectare, litre, tonne, astronomical unit. Some of the units ... Physicists often use units of measure that are based on natural phenomena, particularly when the quantities associated with ... these phenomena are many orders of magnitude greater than or less than the equivalent SI unit. The most common ones have been ...
An example of this phenomenon is that clean air scatters blue light more than red wavelengths, and so the midday sky appears ... Typically, astronomical spectroscopy uses high-dispersion diffraction gratings to observe spectra at very high spectral ... Goethe argued that the continuous spectrum was a compound phenomenon. Where Newton narrowed the beam of light to isolate the ... Chemical elements can be detected in astronomical objects by emission lines and absorption lines. ...
Lorentz, Hendrik Antoon (1909), The theory of electrons and its applications to the phenomena of light and radiant heat, ... Without this postulate it would not be possible to infer the speed of light from astronomical observations, as Rømer did based ... It is what he has succeeded in doing in his article entitled Electromagnetic phenomena in a system moving with any velocity ... C'est ce qu'il a réussi dans son article intitulé Electromagnetic phenomena in a system moving with any velocity smaller than ...
Astronomical. *Big Crunch. *Big Rip. *Coronal mass ejection. *Geomagnetic storm. *False vacuum decay ...
This phenomenon is used to verify the presence of spent nuclear fuel in spent fuel pools for nuclear safeguards purposes.[18] ... observatories using the Cherenkov technique to measure air showers are key to determine the properties of astronomical objects ... He discovered the anisotropy of the radiation and came to the conclusion that the bluish glow was not a fluorescent phenomenon ... On the other hand, the phenomenon can be explained both qualitatively and quantitatively if one takes in account the fact that ...
The idea of a body so massive that even light could not escape was briefly proposed by astronomical pioneer and English ... As such, many of the universe's more energetic phenomena have been attributed to the accretion of matter on black holes. In ... A few theoretical objects have been conjectured to match observations of astronomical black hole candidates identically or near ... Publications of the Astronomical Society of Australia. 24 (2): 46-52. arXiv:0705.1029. Bibcode:2007PASA...24...46L. doi:10.1071 ...
Carl Sagan and Frank Drake considered the hyperfine transition of hydrogen to be a sufficiently universal phenomenon so as to ... Monthly Notices of the Royal Astronomical Society. 459 (3): 2882-2993. arXiv:1604.03059. Bibcode:2016MNRAS.459.2882M. doi: ...
Astronomical. *Big Crunch. *Big Rip. *Coronal mass ejection. *Gamma-ray burst. *Hypercane ...
The Journal of the Royal Astronomical Society of Canada. 103 (1): 7-10. arXiv:0811.0171. Bibcode:2009JRASC.103....7M. Archived ... Some of the phenomena were brief occurrences immediately following the impact, but there were also long-term geochemical and ... "Direct high-precision U-Pb geochronology of the end-Cretaceous extinction and calibration of Paleocene astronomical timescales ...
The 2012 phenomenon predicted the world would end at the end of the 13th b'ak'tun. The Earth would be destroyed by an asteroid ... Schröder, K.-P.; Smith, R.C. (2008). "Distant future of the Sun and Earth revisited". Monthly Notices of the Royal Astronomical ...
Websurf astronomical information: Online tools for calculating Rising and setting times of Sun, Moon or planet, Azimuth of Sun ... 2009). "Total solar irradiance since 1996: is there a long-term variation unrelated to solar surface magnetic phenomena?". ... the value when the Earth-Sun distance is 1 astronomical unit), then the direct sunlight at Earth's surface when the Sun is at ... at a distance of one astronomical unit (AU) (roughly the mean distance from the Sun to Earth). The "solar constant" includes ...
Monthly Notices of the Royal Astronomical Society. Blackwell Publishing. 7 (9): 149-152. Bibcode:1846MNRAS...7..149A. doi: ... Journal of Electron Spectroscopy and Related Phenomena. 101-103: 233-238. doi:10.1016/S0368-2048(98)00451-4.. ... Monthly Notices of the Royal Astronomical Society. Blackwell Publishing. 7 (9): 145-149. Bibcode:1846MNRAS...7..145C. doi: ...
A related phenomenon is the "Belt of Venus" or "anti-twilight arch", a pink band that is visible above the dark blue band of ... Civil, nautical, and astronomical twilight. Dusk is the end of evening twilight.[5] ... Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen ... This atmospheric phenomenon is sometimes seen twice a day, around the times of sunset and sunrise. When the weather conditions ...
In biology and biomedical engineering, in situ means to examine the phenomenon exactly in place where it occurs (i.e., without ... Monthly Notices of the Royal Astronomical Society. 431 (4): 3444-3455. arXiv:1211.1673. Bibcode:2013MNRAS.431.3444C. doi: ... in the same place the phenomenon is occurring without isolating it from other systems or altering the original conditions of ...
Such strong cloud-top winds cause a phenomenon known as the super-rotation of the atmosphere.[3] In other words, these high- ... Using quantitative astronomical spectroscopy, scientists were able to analyse sunlight that passed through the planet's ... Shiltsev, Vladimir (March 2014). "The 1761 Discovery of Venus' Atmosphere: Lomonosov and Others". Journal of Astronomical ... In September 2017 JAXA scientists named this phenomenon 'Venusian equatorial jet'.[28] ...
"Quarterly Journal of the Royal Astronomical Society. 21 (2): 93-107. Bibcode:1980QJRAS..21...93C. Retrieved 12 June 2016.. ... Phenomena. *Time dilation. *Mass-energy equivalence. *Length contraction. *Relativity of simultaneity. *Relativistic Doppler ... "Quarterly Journal of the Royal Astronomical Society. 37 (3): 355-363. Bibcode:1996QJRAS..37..355T. Retrieved 12 June 2016.. ... "Quarterly Journal of the Royal Astronomical Society. 37 (3): 365-367. Bibcode:1996QJRAS..37..365W. Retrieved 12 June 2016.. ...
Main article: Islamic calendar § Astronomical considerations. Traditionally, it is the day (beginning at sunset) of the first ... Subsequent reports indicate that this phenomenon continues to cause concern,[26][27][28][29] one Egyptian journalist writes, ' ... "Taking on Sexual Harassment, a Social Phenomenon in Egypt". Al Jadid Magazine. Archived from the original on 5 August 2013 ...
The goal of Principia was not to provide exact answer for natural phenomena, but to theorize potential solutions to these ... Meeus, J. (1998). Astronomical Algorithms. 2nd ed. Richmond VA: Willmann-Bell. p. 183. ... a fraction of the Earth's rotation time or mean solar day and determined by clocks whose precision was checked by astronomical ...
But the assumption of ether did not properly explain the speed of light in many other phenomena. In 1905, Albert Einstein said ... In the first chapter, Hawking discusses the history of astronomical studies, including the ideas of Aristotle and Ptolemy. ... He writes about cosmological phenomena such as the Big Bang and the black holes. He discusses two major theories, general ...
Publications of the Astronomical Society of Australia, 31: e015, arXiv:1402.1534, Bibcode:2014PASA...31...15M, doi:10.1017/pasa ... characteristic of electromagnetic phenomena) with the development of classical electromagnetism, and finally a class C constant ...
The astronomical phenomenon known as reddening means that near-infrared wavelengths are less affected by dust in the ... Astronomical spectroscopyEdit. Near-infrared spectroscopy is in astronomy for studying the atmospheres of cool stars where ... Astronomical spectrographs have also been developed for the detection of exoplanets using the Doppler shift of the parent star ... It is also used for studying molecules in other astronomical contexts, such as in molecular clouds where new stars are formed. ...
Leicester scientists describe astronomical phenomenon never witnessed before * Leicesters Engineering Building features on ... One of these, giving an overview of all the astronomical follow-up observations, has around 3,500 authors from around 1,000 ...
In addition to this event and its astronomical details, the sky of May will witness other astronomical bodies and phenomena ... The Sky of May 2018 has Astronomical Phenomena other than Ramadan Crescent ... The picture below is a screenshot from one of the most famous astronomy websites accredited for astronomical calculations that ... This phenomenon takes place when Jupiter lies directly opposite to the Sun, which means that it is in its utmost illumination ...
Étienne Léopold Trouvelots Stunning 19th-Century Astronomical Drawings of Celestial Objects and Phenomena. The splendor of the ... Charles Scribners Sons published Trouvelots scientific writings about the phenomena he observed as The Trouvelot Astronomical ... The Astronomical Art of Maria Clara Eimmart: Stunning 17th-Century Drawings of Comets, Planets, and Moon Phases by a Self- ... Unlike the rest of his illustrations, which depict objects and phenomena as they appear in a single moment in time, Trouvelots ...
Astronomical Phenomena. For the Scientific American. British Scientific Association, &C. Special Correspondence of the ...
Astronomical Phenomenon. Artificial Stones. Wholesale Desertion of Wives and Families. A Human Divining Rod. ...
Learn more about atmospheric phenomena like Sundogs, Halos and Light Pillars that are created by the reflection and refraction ... Astronomical Twilight - Definition and Explanation. Astronomical twilight is the darkest of the twilight phases. How is it ... Because of this, scientists who study atmospheric optical phenomena classify them as 60-degree or 90-degree phenomena. ... Astronomical terms & definitions. Ice Crystals Ice crystals can be found high up in the sky all around the world, at any time ...
astrophysics processes the physics of astronomical frequency organizes notably removed by the transition of transformation few ...
3.3: Astronomical phenomena. 3.3.2: Solar system. Solar System Explorer. 3.3.4: Cycles of day and night ...
ES.C: Astronomical phenomena. ES.C.1: Concepts related to astronomy. ES.C.1.b: Earth-Moon system ...
Infographic on Astronomical Phenomena known as Eclipses. 18 x 12 inother sizes ... Infographic in Which the Phenomena of Earths Magnetism and Properties of Magnets Is Described. ...
Atmosphere, World, Globe, Atmospheric phenomenon, Astronomical object, Science, Space. Download Our Wallpaper App. ...
Astronomical Phenomena for the year 2019 Astronomical Phenomena for the year 2019. ...
Modelling explains rare but spectacular astronomical phenomenon. Ben Lewis reports.. A simulation of the turbulent gas that ... A centuries-old astronomical mystery is solved. What was thought to be the formation of a star was actually a cataclysmic ...
523 Specific celestial bodies & phenomena. *524 Not assigned or no longer used ... 525 Earth (Astronomical geography). *526 Mathematical geography. *527 Celestial navigation. *528 Ephemerides ...
Astronomical phenomena for the year ... by United States Naval Observatory( ). * Report of the Secretary of the Navy, ... Astronomical phenomena for the year ... by United States Naval Observatory( ). in English and Undetermined and held by 888 ... The astronomical almanac online( ). in English and held by 323 WorldCat member libraries worldwide The Astronomical Almanac is ... and other astronomical phenomena for a given year, and serves as a world-wide standard for such information. The online version ...
However, its supposed end date was tied to astronomical phenomena by esoteric, fringe, and New Age literature that placed great ... The phenomenon also inspired several rock and pop music hits. As early as 1997, "A Certain Shade of Green" by Incubus referred ... The 2012 phenomenon was a range of eschatological beliefs that cataclysmic or transformative events would occur on or around 21 ... Various astronomical alignments and numerological formulae were proposed for this date. A New Age interpretation held that the ...
The British Astronomical Association 2021. Registered charity no. 210769. Registered company no. 117572. For more information ... The Journal of the British Astronomical Association, 2021 April. Volume 131, Number 2 ... Mutual phenomena of Jupiters moons in 2021 John Rogers. An interview with Alexandra Hart Philip Jennings ...
What they do: Observe, research, and interpret astronomical phenomena. Their work helps improve our basic knowledge of the ...
Astronomical Phenomena Disprove Einsteins Special Relativity Theory. Authors: A. V. Mamaev. Comments: 10 Pages. ISSN 2311-2158 ... This article shows that many astronomical phenomena can be explained by existence in nature of quadratic dependence of light ... of electromagnetic trains corresponding to photons it is possible to explain such astronomical phenomena as bursts of cosmic X ... In the near future we will probably become aware of these phenomena by the 67P measurements of the Rosetta lander mission. ...
... to conduct pure research in astronomical phenomena; and to maintain quality public education and outreach programs to bring the ... Lowell Observatorys 122-year history includes some of the most significant astronomical discoveries in human history. Among ... results of astronomical research to the public".. ...
Mathematical Modelling of Natural Phenomena (1) * Proceedings of the International Astronomical Union (1) ... Journal: Proceedings of the International Astronomical Union / Volume 2 / Issue S238 / August 2006 ...
"Astronomical Phenomena". In Urban, S.E.; Seidelmann, P. K. (eds.). Explanatory supplement to the astronomical almanac (3rd ed ... This phenomenon occurs once every 14.7 years on average, and can last a few weeks before and after the exact equinox. Saturns ... The effect of a larger dip on taller objects (reaching over 2½° of arc on Everest) accounts for the phenomenon of snow on a ... Prior to the 1980s there was no generally accepted term for the phenomenon, and the word "equilux" was more commonly used as a ...
In the 1850s, Gustav Kirchhoff and Robert Bunsen described the phenomena behind these dark lines. Hot solid objects produce ... Tennyson, Jonathan (2005). Astronomical spectroscopy : an introduction to the atomic and molecular physics of astronomical ... Optical Astronomical Instrumentation. 3355: 866-876. doi:10.1117/12.316806.. *^ Oke, J. B.; Gunn, J. E. (1983). "Secondary ... Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of ...
Dordrecht: International Astronomical Union. pp. 161-75. Bibcode:1974IAUS...56..161Z.. *↑ Q-Z Luo; N. DAngelo; R. L. Merlino ( ... H. Zinn (1965). C. C. Chang; S. S. Huang (eds.). Solar Flares and Concurrent Phenomena in the Solar Atmosphere, In: Proceedings ... 25.0 25.1 25.2 25.3 25.4 Harold Zirin (October 1964). "The Limb Flare of November 20, 1960: a Coronal Phenomenon". ... Solar Physics Division, American Astronomical Society. Retrieved 15 June 2011.. *↑ Laura Layton (May 15, 2009). STEREO Spies ...
the astronomical phenomena involved in those various calendars. *an exploration of biological rhythms in plants, animals, and ... A wonderful way to inculcate a sense of scale, both astronomical and microscopic. ... A wonderful way to inculcate a sense of scale, both astronomical and microscopic. ... interesting examples of the traces of ancient astronomical observations in many different cultures ...
523 Specific celestial bodies & phenomena. 524 Not assigned or no longer used. 525 Earth (Astronomical geography). 526 ... 130 Paranormal phenomena. 131 Occult methods for achieving well-being. 132 Not assigned or no longer used. 133 Parapsychology ... 535 Light & paraphotic phenomena. 536 Heat. 537 Electricity & electronics. 538 Magnetism. 539 Modern physics. 540 Chemistry & ...
Astronomical and geophysical imaging • Visualization of nonlinear natural phenomena • real-time imaging ...
1.Astronomical InstituteCzechosl. Acad. Sci.Prague. About this article. Cite this article as: Burša, M. & Šimon, Z. Stud ... Structural Geology Secular Variation Polar Motion Secular Decrease Geodynamic Phenomenon These keywords were added by machine ... A note on secular variation of gravity due to non-tidal geodynamic phenomena. ...
The zodiacal light is a very rare astronomical phenomenon. It is important in Islam because Muhammad used it to describe the ...
Reference: Exploring the potential psychiatric implications of astronomical phenomena (2019). *62,203 patients with mental ... Reference: Self-inflicted burns: a sporadic phenomenon (2004). *2,497 suicides in a 3-year period: no relationship between the ... Reference: The influence of lunar phenomena on the incidence of emergency cases (2003). *1,240 cases of myocardial infarction ...
  • astrophysics processes the physics of astronomical frequency organizes notably removed by the transition of transformation few disk rendering, browser set, phone, part and Monte Carlo level. (kosmetikstudio-mueller.de)
  • The website introduces the Society's many sections including Computing, Cosmology and Astrophysics, Current Phenomena, and Radio Astronomy. (nottingham.ac.uk)
  • The conference program and the papers of this volume are organized in 6 parts: (1) Sun, Planets and Interplanetary Medium, (2) Stars, Exoplanets, and the Interstellar Medium, (3) Extragalactic Astrophysics and Cosmology, (4) Dynamical Astronomy and Relativistic Astrophysics, (5) Astronomical Infrastructure and (6) History and Education in Astronomy. (aspbooks.org)
  • Observe, research, and interpret astronomical phenomena. (businessinsider.com)
  • Observe, research, and interpret astronomical phenomena to increase basic knowledge or apply such information to practical problems. (bls.gov)
  • One of these, giving an overview of all the astronomical follow-up observations, has around 3,500 authors from around 1,000 institutions. (le.ac.uk)
  • The picture below is a screenshot from one of the most famous astronomy websites accredited for astronomical calculations that show this year's observations conditions. (bibalex.org)
  • Together, the French scientists developed daguerreotype photography for astronomical observations by taking the first detailed photographs of the sun's surface in 1845. (fsu.edu)
  • The results of Mayan observations and calculations of astronomical phenomena are concentrated in the Dresden Codex. (mujweb.cz)
  • Some based their argument on the Shujing (Book of Documents) and concluded that Chinese star clerks had already made astronomical observations between 2000 and 3000 BCE. (springer.com)
  • Some calendars are regulated by astronomical observations, some carefully and redundantly enumerate every unit, and some contain ambiguities and discontinuities. (nasa.gov)
  • In astronomy and celestial navigation, an ephemeris (plural: ephemerides) gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and possibly velocity) over time. (wikipedia.org)
  • The Explanatory Supplement provides a detailed description of how to perform practical astronomy or spherical astronomy, how the computations for the Astronomical Almanac are performed, and the underlying information required by someone using the Almanac or wanting to perform related computations. (worldcat.org)
  • Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation , including visible light and radio, which radiates from stars and other celestial objects. (wikipedia.org)
  • Theoretical astronomy at its simplest is the definition of terms to be applied to astronomical effort and the phenomenological results. (wikiversity.org)
  • The Astronomical Society of Victoria website promotes its efforts to act as a forum for a wide variety of people interested in astronomy. (nottingham.ac.uk)
  • The branch of astronomy that deals with the physics of astronomical objects and phenomena. (amnh.org)
  • Organization of an astronomy evening every month according to the 2009 astronomical agenda. (astronomy2009.org)
  • The Astronomical Almanac is a joint publication of the U.S. Nautical Almanac Office, United States Naval Observatory (USNO), in the United States and Her Majesty's Nautical Almanac Office (HMNAO), United Kingdom Hydrographic Office (UKHO), in the United Kingdom. (worldcat.org)
  • Astronomers have just celebrated the inauguration of the Green Bank Observatory in West Virginia, home to the 100-metre Green Bank Telescope, one of the world's most powerful astronomical instruments. (astronomynow.com)
  • The Proceedings Series of the International Astronomical Union (IAU) comprises high-quality and timely previews and reviews of fundamental and state-of-the-art astrophysical developments around the world, as presented at some ten IAU-sponsored conferences per year. (researchgate.net)
  • These are the proceedings of the 9th international astronomical conference organized by the Hellenic Astronomical Society (Hel.A.S.), the professional organization of all Greek astronomers. (aspbooks.org)
  • Reprinted from the Explanatory Supplement to the Astronomical Almanac , P. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA 94965. (nasa.gov)
  • Some of the astronomical phenomena of interest to astronomers are eclipses, apparent retrograde motion/planetary stations, planetary ingresses, sidereal time, positions for the mean and true nodes of the moon, the phases of the Moon, and the positions of minor celestial bodies such as Chiron. (wikipedia.org)
  • Some of these books are progressive enough to mention that there were ancient astronomers at Stonehenge, but most overlook Newgrange and Ireland, which is evidently a place where competent astronomical study was taking place over 5,000 years ago. (mythicalireland.com)
  • Most astronomers believe in the theory based on observed astronomical phenomenon. (askmehelpdesk.com)
  • The size, shape, and distance from the Earth's surface of the ice crystals determine what kind of optical phenomenon people on Earth will observe. (timeanddate.com)
  • Transients refer to astronomical phenomena with durations of fractions of a second to weeks or years. (nature.com)
  • It's "terran" inception and unit durations reflect the human biological clock and align with astronomical cycles and epochs . (slashdot.org)
  • Astronomical observatories were built and designed to map celestial events throughout the year. (crystalinks.com)
  • The printed version contains precise ephemerides of the Sun, Moon, planets, and satellites, data for eclipses and other astronomical phenomena for a given year, and serves as a world-wide standard for such information. (worldcat.org)
  • He explained solar eclipses and wrote at length about astronomical, meteorological, and biological phenomena. (thefreelibrary.com)
  • The astronomical position calculated from an ephemeris is given in the spherical polar coordinate system of right ascension and declination. (wikipedia.org)
  • Subsequently he concerned himself largely with applying nuclear physics to astronomical phenomena. (encyclopedia.com)
  • The rich diversity of magnetic phenomena and magnetic materials provides a fascinating history of fundamental physics studies and the basis for a stream of technological applications. (aps.org)
  • By applying some basic physical principles to a variety of situations, students will learn how to relate everyday physics to the astronomical world. (google.com)
  • Because of this, scientists who study atmospheric optical phenomena classify them as 60-degree or 90-degree phenomena. (timeanddate.com)
  • Scientists still don't know exactly what's going on, but they attribute the phenomenon to an enigmatic thing called dark energy. (nationalgeographic.com)
  • The Schrödinger Equation is well studied, and finding that such a quintessential equation is able to describe the long-term evolution of astrophysical disks should be useful for scientists who model such large-scale phenomena. (caltech.edu)
  • There exists a great amount of misinformation about the phenomenon not only in the minds of the public, but among educated groups such as scientists as well. (bibliotecapleyades.net)
  • The October 13 phenomenon was the best reported and was witnessed by a crowd of about 70,000 persons, including a number of scientists, reporters, atheists, and agnostics, as well as faithful Catholics. (bibliotecapleyades.net)
  • Morphogenesis is not only a biological phenomenon, but is also physical, geological, astronomical and even sociological. (utoronto.ca)
  • Modern ephemerides are often computed electronically, from mathematical models of the motion of astronomical objects and the Earth. (wikipedia.org)
  • books.google.com - This fully revised and updated text is a comprehensive introduction to astronomical objects and phenomena. (google.com)
  • Massive astronomical objects are frequently encircled by groups of smaller objects that revolve around them, like the planets around the sun. (caltech.edu)
  • Sundogs, light pillars, and other kinds of halos seen in the sky are atmospheric phenomena that occur when light is reflected or refracted by ice crystals in the atmosphere. (timeanddate.com)
  • Parhelic circles are a rarer optical atmospheric phenomenon. (timeanddate.com)
  • It contains a number of calendar data, written in the Mayan dating system, concerning astronomical data and the sky mechanics, the tables of the integers multiples, that are to be used for calculations of planetar movement efemerids and tropical years, next the hieroglyphic texts and numerous depicturings of the Mayan gods and ritual scenes. (mujweb.cz)
  • How can an astronomical object of such crucial cosmological importance remain so fundamentally mysterious? (nationalgeographic.com)
  • Last but not least: the solstice is a fundamentally difficult astronomical phenomena to measure. (slashdot.org)
  • Architecturally, city buildings included palaces, pyramid-temples , ceremonial ballcourts , and structures specially aligned for astronomical observation. (wikipedia.org)
  • However, a surprising new discovery from a Caltech researcher suggests that the Schrödinger Equation-the fundamental equation of quantum mechanics-is remarkably useful in describing the long-term evolution of certain astronomical structures. (caltech.edu)
  • The possibility of complementary descriptions of the physical phenomena with the help of simultaneous use of the theories of gravitational and electromagnetic fields has been shown. (vixra.org)
  • Nature" refers to the phenomena of the physical world, and also to life in general. (absoluteastronomy.com)
  • An introduction to the evolution of physical theories and models of natural phenomena from ancient Greece to modern times. (dartmouth.edu)
  • The solar alignment at Newgrange is very precise compared to similar phenomena at other passage graves such as Dowth or Maes Howe in the Orkney islands, off the coast of Scotland. (crystalinks.com)
  • Although some calendars replicate astronomical cycles according to fixed rules, others are based on abstract, perpetually repeating cycles of no astronomical significance. (nasa.gov)
  • The complexity of calendars arises because these cycles of revolution do not comprise an integral number of days, and because astronomical cycles are neither constant nor perfectly commensurable with each other. (nasa.gov)
  • The solar wind slows to subsonic velocities at the termination shock, 90-100 astronomical units from the Sun . In the region beyond the termination shock, called the heliosheath, interstellar matter interacts with the solar wind. (newworldencyclopedia.org)
  • These disks, made up of countless individual particles orbiting en masse, can range from the size of the solar system to many light-years across. (caltech.edu)
  • The in the Dresden Codex contained data were studied by many researchers that have supposed they can contain even the astronomical data. (mujweb.cz)
  • Researchers using the Karl G. Jansky Very Large Array (VLA) have produced the most detailed image yet of a fascinating region where clusters of hundreds of galaxies are colliding, creating a rich variety of mysterious phenomena visible only to radio telescopes. (astronomynow.com)
  • By combining the latest developments in neutron scattering and theory, researchers are close to predicting phenomena like superconductivity and magnetism in strongly correlated electron systems. (newswise.com)
  • The principal astronomical cycles are the day (based on the rotation of the Earth on its axis), the year (based on the revolution of the Earth around the Sun), and the month (based on the revolution of the Moon around the Earth). (nasa.gov)
  • at Knowth, there is a wealth of astronomical imagery - crescents and moon shapes, stars, circles, spirals, sundials and astral imagery, and possibly even a map of the moon. (mythicalireland.com)
  • It is the purpose of this series of essays to describe various aspects of the phenomenon, make clear my prejudices and the reasons for them, and to suggest a means of proceeding on this interesting and potentially very significant problem. (bibliotecapleyades.net)
  • The publication of a various brochures outlining the most important astronomical Phenomena. (astronomy2009.org)
  • Publication of an agenda of the most important phenomena. (astronomy2009.org)
  • Accepted for publication in Monthly Notices of the Royal Astronomical Society. (arxiv.org)
  • Learners will understand the astronomical phenomenon of solstice. (polartrec.com)
  • Nature has constructed astronomical experiments which exhibit the full range of gravitational phenomena. (aps.org)
  • Sundogs are some of the most frequently observed optical phenomena and can be observed throughout the year and anywhere in the world. (timeanddate.com)
  • Anyone visiting the historic site can experience an approximation of the phenomenon any time of year, and is often the highlight of the tour. (crystalinks.com)
  • The paper was entitled "The Astronomical Progress and Phenomena for the Year, Oct. 1, 1887, to Oct. 1, 1888," and reviewed the work accomplished. (nytimes.com)
  • The astronomical inquiry of the ancients must be looked upon as a mechanism of observation and prediction which closely tied them to their environments, depending upon their cultural, religious and mythological bases for validation in the process. (crystalinks.com)
  • The Maya civilization ( / ˈ m aɪ ə / ) was a Mesoamerican civilization developed by the Maya peoples , and noted for its logosyllabic script -the most sophisticated and highly developed writing system in pre-Columbian Americas -as well as for its art , architecture , mathematics , calendar , and astronomical system. (wikipedia.org)
  • While theories may address ideas and empirical phenomena which are not easily measurable, scientific theory is generally understood to refer to a proposed explanation of empirical phenomena, made in a way consistent with scientific method . (wikiversity.org)
  • A coronal cloud is a cloud, or cloud-like, natural astronomical entity, composed of plasma and usually associated with a star or other astronomical object where the temperature is such that X-rays are emitted. (wikiversity.org)
  • Chapter 7: Covariance of Maxwell's equations in material media and its application to phenomena such as the Doppler effect. (doverpublications.com)
  • You will also read about how the Greeks helped to enlighten the world with their many scientific and astronomical discoveries. (mythicalireland.com)
  • Chao Wang , Hong Zhang , Fan Wu , Bo Zhang , Yixian Tang , Hongan Wu , Xiaoyang Wen , and Dongmei Yan "Disaster phenomena of Wenchuan earthquake in high resolution airborne synthetic aperture radar images," Journal of Applied Remote Sensing 3(1), 031690 (1 May 2009). (spiedigitallibrary.org)
  • With this event, we wish to explore Emergent Form not only as a series of natural and human phenomena that often seem too complicated to understand, measure or predict, but also as a concept that helps us identify ways in which we can come to term with, and embrace their complexity as a source of inspiration. (utoronto.ca)
  • Not only did Hogg have a strong reputation in academics, but she was also popular among the general public due to a weekly newspaper column she wrote to explain astronomical phenomena to lay people. (encyclopedia.com)
  • A curious thing is happening of late across the interwebs, a social phenomenon as prolific as the cinnamon challenge - some people seem to be coming to their senses. (sott.net)
  • With simple stone technology, these wonderful people captured a very significant astronomical and calendrical moment in the most spectacular way. (mythicalireland.com)
  • Fizeau also studied another important phenomenon of light. (fsu.edu)
  • One of the most important problems during the studies of various Mayan culture phenomena had been the solving of the Mayan to our, Christian dating system correlation. (mujweb.cz)
  • Among the familiar patterns, such as zig-zags, waved lines, spirals and lozenes, there are some decorations which are distinctly astronomical in nature. (mythicalireland.com)
  • Scientific method refers to a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. (absoluteastronomy.com)
  • For each planet, the cube of the planet's distance from the sun, measured in astronomical units (AU), is equal to the square of the planet's orbital period, measured in Earth years. (newworldencyclopedia.org)
  • And 2000 years later in Scotland, much simpler monuments were still being built that had at least one of the same astronomical alignments found at the great circles. (phys.org)
  • An astronomical phenomenon was found in blackened cosmos. (darklyrics.com)
  • One of these non-intuitive behaviors is that subatomic particles actually behave more like waves than like discrete particles-a phenomenon called wave-particle duality. (caltech.edu)
  • Get the latest astronomical news and stargazing tips delivered to your inbox. (astronomynow.com)