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).
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.
A plant genus of the family RUTACEAE. They bear the familiar citrus fruits including oranges, grapefruit, lemons, and limes. There are many hybrids which makes the nomenclature confusing.
The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.
The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.
A two-person sport in which the fists are skillfully used to attack and defend.

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 ...
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, ...
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 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.
These X-ray pulses take 300 years to traverse the distance between the central black hole and a large cloud known as Sagittarius B2, so the cloud responds to events that occurred 300 years earlier. When the X-rays reach the cloud, they collide with iron atoms, kicking out electrons that are close to the atomic nucleus. When electrons from farther out fill in these gaps, the iron atoms emit X-rays. But after the X-ray pulse passes through, the cloud fades to its normal brightness. Amazingly, a region in Sagittarius B2 only 10 light-years across varied considerably in brightness in just 5 years. These brightenings are known as light echoes. By resolving the X-ray spectral line from iron, Suzakus observations were crucial for eliminating the possibility that subatomic particles caused the light echoes. By observing how this cloud lit up and faded over 10 years, we could trace back the black holes activity 300 years ago, says team member Katsuji Koyama of Kyoto University. The black hole was a ...
It is said that fact is sometimes stranger than fiction, and nowhere is that more true than in the case of black holes. Black holes are stranger than anything dreamed up by science fiction writers.. In 2016 Professor Stephen Hawking delivered the BBC Reith Lectures on a subject that has fascinated him for decades - black holes.. In these flagship lectures the legendary physicist argues that if we could only understand black holes and how they challenge the very nature of space and time, we could unlock the secrets of the universe. ...
Another model involves a dense stellar cluster undergoing core-collapse as the negative heat capacity of the system drives the velocity dispersion in the core to relativistic speeds.[24] Finally, primordial black holes could have been produced directly from external pressure in the first moments after the Big Bang. These primordial black holes would then have more time than any of the above models to accrete, allowing them sufficient time to reach supermassive sizes. Formation of black holes from the deaths of the first stars has been extensively studied and corroborated by observations. The other models for black hole formation listed above are theoretical. The difficulty in forming a supermassive black hole resides in the need for enough matter to be in a small enough volume. This matter needs to have very little angular momentum in order for this to happen. Normally, the process of accretion involves transporting a large initial endowment of angular momentum outwards, and this appears to be ...
These four images are from a computer simulation of a star flying by and disrupting a circumstellar disk of dust around the star Beta Pictoris. Frame (a) shows the encounter setup, where a small M-class star swings within 700 astronomical units (1 AU is the distance between Earth and the Sun) of Beta Pictoris, an A-class star. The circumstellar disk, seen as a black donut in this overhead view, has a 500 AU radius. In (b) the gravitational tug of the intruder star pulls the dust disk into two tidal tails stretching far beyond the disks initial radius. Like spaghetti wrapped around a fork, the tidal tails are tangled together in (c). This leads to the formation of concentric ringlets of dust (d) on one side of the star. The entire sequence takes 100,000 years. This simulation explains observed asymmetries, knots, and other unique features of the Beta Pictoris disk.. ...
About the AdS/CFT solution of the problem: Suppose [a] that you believe in string theory [I do], then I think that it is reasonable to believe in AdS/CFT. Then it is reasonable to believe that there is no information loss for AdS black holes. BUT it is NOT reasonable to conclude from this that there is no information loss for realistic black holes. In particular, it is very silly indeed to argue that black holes are local objects, so whatever works in AdS must work in the real world. Because AdS/CFT is *not* local in this sense --- if you believe that black holes are really local objects then you should not believe that AdS/CFT is relevant in the first place! As for the argument that nothing special should happen when you tune the AdS cosmological constant from small negative to small positive values, yeah, well, thats a great argument. I can use exactly the same logic to prove that ice can never melt. [Just tune the temperature up from -1 C to +1 C --- of course nothing special ...
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In the present work, nano-sized titanium carbide (TiC) particles were successfully synthesized through a process of producing carbon coated titanium precursors, heating these precursors under vacuum conditions at 1450 °C for 2 h, and treating the products in hydrogen/argon (1 : 1) mixed gas or hydrogen gas. The eff
We present the results of analyzing H$\alpha$ spectra of the radio emitting X-ray binary LS I+61303. For the first time, the same 26.5 d radio period is clearly detected in the H$\alpha$ emission line. Moreover, the equivalent width and the peak separation of the H$\alpha$ emission line seem also to vary over a time scale of 1600 days. This points towards the $\sim4$ yr modulation, detected in the radio outburst amplitude, being probably a result of variations in the mass loss rate of the Be star and/or density variability in the circumstellar disk. In addition, the dependence of the peak separation from the equivalent width informs us that the LS I+61303 circumstellar disk is among the densest of Be-stars ...
El 24 de agosto de 2011, astrónomos del proyecto Palomar Transient Factory anunciaron la detección de una supernova en la vecina galaxia M101. El objeto, inicialmente llamado PTF11kly, fue en principio observado alrededor de magnitud 17.2, pero desde entonces ha subido de brillo rápidamente. Observadores de todo el mundo, tanto aficionados como profesionales, comenzaron a observar esa zona, y pronto se la confirmó como una supernova y se le otorgó la designación oficial SN 2011fe. Esta nueva supernova de tipo Ia ya es una de las más brillantes visibles desde la Tierra de los últimos 20 años y promete ser una atracción, tanto para observadores visuales como con instrumentos, por el resto of 2011 y más allá.. Las supernovas de tipo Ia se forman tras el colapso de una enana blanca en sistemas binarios de órbitas muy cerradas conocidos como variables cataclísmicas. Cuando una enana blanca recolecta suficiente materia de su compañera para alcanzar una masa crítica de 1.4 veces la ...
My own view is that a black hole may evaporate but by quantum mechanical means other than Hawking radiation. A black hole is simply a stellar corpse which cannot be supported by the quantum mechanical effects of electron degeneracy pressure (white dwarf) or neutron degeneracy pressure (neutron star). So, does the corpse collapse into an object of infinite density which allows nothing to escape? Balderdash! There must be another level of degeneracy pressure which prevents the singularity. Quark degeneracy? Preon degeneracy? Unkown at this point. So, what would likely happen inside the event horizon if we assume this third quantum mechanical pressure? On black hole formation, all the incoming matter and energy from the stellar corpse would collapse inward at high velocity until it reached the third degeneracy pressure, then it would be forced to bounce off violently just like a supernova explosion. But, this supernova explosion would be gravitationally contained. By Einsteins equivalence ...
New SOFIA/FORCAST spectra of Galactic carbon stars have revealed strong ties between the stellar pulsations that these stars are undergoing and the dust and molecular gas that surround them. A fundamental issue in stellar astrophysics is the role such evolved low- and intermediate-mass stars play in the chemical enrichment of the Universe. Carbon stars, asymptotic giant
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 ...
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 ...
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 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.. ...
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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Huge. Massive. Gigantic. Monstrous. Ginormous. Words fail to describe two huge black holes that may be the largest ever measured. Supermassive black holes inhabit most large galaxies, but these are super-huge light-sucking monstrosities.. The first is in galaxy NGC 3842 and it has the mass of about 10 billion suns, while NGC 4889′s monster could weigh up to 37 billion suns, according to Nicholas McConnell at the University of California, Berkeley. They are able to get the estimates by observing the motion of stars near these galaxies cores, because a black holes mass determines how fast objects orbit around them.. However its not as straight forward as that. For instance, in 2008, a mass of 18 billion suns was claimed for the black hole inside a distant bright galaxy called OJ287. But this is an assumption based on the thought that periodic flares from OJ287 are created by a second black hole orbiting the first. As McConnell says, Observations cannot rule out alternative ways of creating ...
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 ...
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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.. ...
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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
A historic puzzle concerned the source of energy that can maintain the optical supernova glow for months. Although the energy that disrupts each type of supernovae is delivered promptly, the light curves are dominated by subsequent radioactive heating of the rapidly expanding ejecta. Some have considered rotational energy from the central pulsar. The ejecta gases would dim quickly without some energy input to keep it hot. The intensely radioactive nature of the ejecta gases, which is now known to be correct for most supernovae, was first calculated on sound nucleosynthesis grounds in the late 1960s.[98] It was not until SN 1987A that direct observation of gamma-ray lines unambiguously identified the major radioactive nuclei.[99]. It is now known by direct observation that much of the light curve (the graph of luminosity as a function of time) after the occurrence of a Type II Supernova, such as SN 1987A, is explained by those predicted radioactive decays. Although the luminous emission consists ...
Messier 15, or M 15 among friends, is a globular cluster located 10 kiloparsecs or so from us, one of the 150 or so globular cluster associate with the Milky Way galaxy. In addition to being very pretty, its very old, about 12 billion years, nearly as old as the Universe itself (13.6 billion, or so). All the 100,000 stars in it are thought to have formed at about the same time from a single large gas cloud. Blue stars, you may recall, are all very young - they burn themselves out quickly. So how does M 15 have some blues? Its thought that they may have formed from collisions or mergers of smaller stars, perhaps those that formed as close binaries. M 15 is also thought to harbor an intermediate mass black hole (IMBH), a black hole larger than those formed in Supernovae of a few solar masses, but smaller than the million and billion solar mass monster than inhabit the center of galaxies - perhaps a few thousand solar masses. It also has a planetary nebula, the blue patc ...
Black holes are creating havoc in unsuspected places, according to a new study of images of elliptical galaxies made by NASAs Chandra X-ray Observatory. The discovery of far-reaching explosive activity, due to giant central black holes in these old galaxies, was a surprise to astronomers.
Download the transcript. Fraser: Astronomy Cast Episode 181 for Monday March 15, 2010, Rotation. Welcome to Astronomy Cast, our weekly facts-based journey through the cosmos, where we help you understand not only what we know, but how we know what we know. My name is Fraser Cain, Im the publisher of Universe Today, and with me is Dr. Pamela Gay, a professor at Southern Illinois University Edwardsville. Hi Pamela, howre you doing?. Pamela: Im doing well. How are you doing?. Fraser: Excellent, as usual. Alright, so everything in the universe is spinning. In fact, without this rotation, life on Earth wouldnt even exist. We need the conservation of angular momentum to flatten out galaxies and solar systems, and to make planets possible. Lets find out about the physics involved in everything that spins and finally figure out the difference between centripetal and centrifugal force. Man, there is nothing that makes physics geeks madder than to misuse centrifugal and centripetal force. Honestly, I ...
There are three research units in the division: Galactic Astronomy , Extragalactic Astronomy and Plasma Physics and Fusion Energy​ ​. Our research covers a wide range of topics from planetary atmospheres, through the early evolution of stars and planets, to late stages of stellar evolution, the phys
Jens Hackmann took this amazing photo of the Milky Way over Weikersheim in southern Germany. http://epod.usra.edu/archive/epodviewer.php3?oid=322784See also: Milky Way over Utah | Milky Way over Arizona...
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, ...
Breit, Derek C. (March 12, 2010). "Diary of Astronomical Phenomena 2010". Poyntsource.com. Retrieved 2010-04-13. Firestone, R. ... the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for ... Monthly Notices of the Royal Astronomical Society. 151 (2): 161-176. Bibcode:1971MNRAS.151..161H. doi:10.1093/mnras/151.2.161. ... Journal of the Royal Astronomical Society of Canada. 37 (4): 134. Bibcode:1943JRASC..37..129R. Moesgaard, Kristian P. (1973). " ...
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, ... 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 ... subscription required) DeMeis, Salvo (December 30, 2014). Heliacal Phenomena: An Astronomical Introduction for Humanists. ...
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 ...
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. Retrieved ...
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 ...
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 Greek and can be shown to have utilized Babylonian astronomical data. He was a Roman citizen, but was ... Ptolemy's Handy Tables provided the model for later astronomical tables or zījes. In the Phaseis (Risings of the Fixed Stars), ...
... 's observatory is a useful place to see astronomical phenomena. San Isidro Festivals: in spring, the week of 15 May. San ...
Tidal data is based on astronomical phenomena and is predictable. Storm force winds blowing from a steady direction for a ...
McRae, Mike (24 April 2017). "Introducing Steve - a Newly Discovered Astronomical Phenomenon". ScienceAlert. ESA web page on ... In April 2017, Swarm's data was used to confirm that Steve was a previously unrecognized atmospheric phenomenon. Spaceflight ...
Maunder, Michael (2007). Lights in the Sky: Identifying and Understanding Astronomical and Meteorological Phenomena. Springer. ... The Church has had a long-standing interest in astronomy, due to the astronomical basis of the calendar by which holy days and ... The Vatican Observatory (Latin: Specola Vaticana) is an astronomical research and educational institution supported by the Holy ... Dennis Sadowski (2010-01-04). "American Astronomical Society honors former Vatican Observatory head". Catholic News Service. ...
Ptolemy believed that astronomical phenomena caused the changes in seasonal weather; his explanation of why there was not an ... With the astronomical computations were expected weather phenomena, composed as a digest of observations made by various ... At that time in the West, it would have been prestigious to attach an Arabic appellation to a set of astronomical tables. Also ... "auxiliary astronomical tables" based on Ptolemy's Almagest. The earliest known almanac in this modern sense is the Almanac of ...
Hynek, J. A.; Dunlap, J. R. (February 1966), "A Lunar Transient Phenomena Detection Program", Astronomical Journal, 71: 389, ... Lunar Transient Phenomena", Journal of the Royal Astronomical Society of Canada, 75: 237-241, Bibcode:1981JRASC..75..237R Edith ... In October 1965, a NASA program to detect transient lunar phenomenon (TLP) was begun by the staff. Using two-person observer ... Observatory reports", Bulletin of the American Astronomical Society, 5: 164-166, Bibcode:1973BAAS....5..164H Bahng, J. D. R. ( ...
The ancients believed that astronomical phenomena were connected to terrestrial events. Miracles were routinely associated with ... Magi and astronomical events were linked in the public mind by the visit to Rome of a delegation of magi at the time of a ... Kidger, Mark (2005), Astronomical Enigmas: Life on Mars, the Star of Bethlehem, and Other Milky Way Mysteries, Baltimore: Johns ... Mark Kidger, Astronomical Enigmas: Life on Mars, the Star of Bethlehem, and Other Milky Way Mysteries, (Johns Hopkins ...
... viewed these astronomical phenomena in supernatural terms as well. The signs of comets, eclipses, and movements of ... His intensive astronomical work was rewarded only with the rank and salary of 600 bushels, or shi, of grain (mostly commuted to ... In order to use the Euclidean system of geometry as a model for the development of astronomical theory, Ptolemy first had to ... He invented the world's first water-powered armillary sphere to assist astronomical observation; improved the inflow water ...
These octavo volumes contained information on eclipses and other astronomical phenomena. In 1767 he began publishing Guía de ...
Transits of Venus are among the rarest of predictable astronomical phenomena. They occur in a pattern that generally repeats ... Unfortunately, it was impossible to time the exact moment of the start and end of the transit because of the phenomenon known ... Astronomical Society of the Channel Island of Guernsey. Retrieved 1 March 2012. Shortt, David (22 May 2012). "Some Details ... The American Astronomical Society. 644 (1): L37-L40. arXiv:astro-ph/0603276 . Bibcode:2006ApJ...644L..37G. doi:10.1086/505421. ...
Identifying and Understanding Astronomical and Meteorological Phenomena. Springer. p. 116. ISBN 1846287618. Retrieved 28 ... Images from Australia by Crayford Manor House Astronomical Society Total Solar Eclipse of 4 December 2002 seen in EUMETSAT ...
523 Specific celestial bodies & phenomena. *524 Not assigned or no longer used ... 525 Earth (Astronomical geography). *526 Mathematical geography. *527 Celestial navigation. *528 Ephemerides ...
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 ...
Another astronomical phenomenon is the Aurora Borealis (Northern Lights). These in fact occur every year on a few days, but ...
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 ... ladies were added as astronomical computers'. Nevill published a major paper on corrections to Hansen's Tables - using 1500 ...
I.A., Ahmad (1995). "The Impact of the Qur'anic Conception of Astronomical Phenomena on Islamic Civilization" (PDF). Vistas in ... 1969). "To Save the Phenomena: An Essay on the Idea of Physical Theory from Plato to Galileo". University of Chicago Press, ... The Islamic understanding of the astronomical model was based on the Greek Ptolemaic system. However many early astronomers had ...
In many cases astronomical phenomena viewed from the planet Mars are the same or similar to those seen from Earth but sometimes ... Mars Global Surveyor MOC2-368 Release Astronomical Phenomena From Mars 1990A&A...233..235B Page 235 1991BAICz..42..271P Page ... 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 ...
1778 John Ingen-Housz, Electrical Experiments to explain how far the Phenomena of the Electrophorus may be accounted for by Dr ... 1838 James Ivory, On the Theory of the Astronomical Refractions. 1837 William Henry Fox Talbot, Further Observations on the ... 1847 William Robert Grove, On certain Phenomena of Voltaic Ignition and the Decomposition of Water into its constituent Gases ... 1807 Humphry Davy, On some new Phenomena of Chemical Changes produced by Electricity, particularly the Decomposition of the ...
Surviving records identify it as an astronomical and historical phenomenon. It was observed in the Hejaz in Safar 1184 AH (June ... On July 1, 1770, the comet passed 0.015 astronomical units from Earth, or approximately 6 times the radius of the Moon's orbit ... approaching to a distance of only 0.015 astronomical units (2,200,000 km; 1,400,000 mi). The comet has not been seen since 1770 ... Proceedings of the 236th Symposium of the International Astronomical Union, Cambridge University Press, 2006, xvii-xviii Hall, ...
... s are a relatively recently identified astronomical phenomenon. In contrast to the typical and well known ...
An optical phenomenon, the Dawes limit, is named after him. Dawes, William Rutter (1849). The Stars in Six Maps, on the ... He won the Gold Medal of the Royal Astronomical Society in 1855. Dawes craters on the Moon and Dawes crater on Mars are named ... ISBN 978-0-684-10114-9. Monthly Notices of the Royal Astronomical Society, 1855, 15, 148 - Awarding of RAS gold medal Monthly ... Ashbrook, Joseph (1984). The Astronomical Scrapbook. Cambridge, Massachusetts: Sky Publishing. pp. 360-365. (Adapted from Sky ...
The phenomenon has not been scientifically confirmed. Its potential causes remain disputed, but it may be associated with ... McKellar, A. Journal of the Royal Astronomical Society of Canada, Vol. 54, p.97. Bibliographic Code: 1960JRASC..54...97M Levine ... In 1969, it was hypothesized that the Ashen light is an auroral phenomena due to solar particle bombardment on the dark side of ... Baum, R. M. (2000). "The enigmatic ashen light of Venus: an overview". Journal of the British Astronomical Association. 110: ...
The International Astronomical Union Circulars (IAUCs) are notices that give information about astronomical phenomena. IAUCs ... The IAUCs are delivered via the United States Postal Service, e-mail, and through the Central Bureau for Astronomical Telegrams ... are issued by the International Astronomical Union's Central Bureau for Astronomical Telegrams (CBAT) at irregular intervals ...
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. ...
Astronomical Phenomena for the year 2019 Astronomical Phenomena for the year 2019. ...
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, ...
Breit, Derek C. (March 12, 2010). "Diary of Astronomical Phenomena 2010". Poyntsource.com. Retrieved 2010-04-13. Firestone, R. ... the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for ... Monthly Notices of the Royal Astronomical Society. 151 (2): 161-176. Bibcode:1971MNRAS.151..161H. doi:10.1093/mnras/151.2.161. ... Journal of the Royal Astronomical Society of Canada. 37 (4): 134. Bibcode:1943JRASC..37..129R. Moesgaard, Kristian P. (1973). " ...
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 ...
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 ...
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. ...
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 ...
The zodiacal light is a very rare astronomical phenomenon. It is important in Islam because Muhammad used it to describe the ...
a form of photography used to record astronomical phenomena. astrophysics the branch of astronomy concerned with the origin, ... the astronomical studies of the planet Mars. - areologist, n. - areologic, areological, adj. asterism Rare. a constellation or ... astronomer, n . - astronomical, adj. astrophile a person strongly attracted to knowledge about the stars. - astrophilic, adj. ... Obsolete, an instrument, like an astrolabe, used for astronomical observations. cosmonautics astronautics. -cosmonaut. n. - ...
a form of photography used to record astronomical phenomena. autoradiograph radioautograph. autotype 1. a photographic process ...
Evidence of Consciousness in the Multiverse: From Sub-Atomic to Astronomical Phenomena. Presented by Jed Eye. What is the ...
The phenomena observed are located in the heavens, far beyond the reach, let alone control, of the astronomical observer.[1] " ... Sky is an astronomical entity.[7] Included as astronomical entities are astronomical objects and astronomical sources, ... Def. "149,597,870,700 meters" is called the Astronomical Unit.[51] Def. "the mass of the Sun" is called the astronomical unit ... Astronomical entities include some journals (such as The Astrophysical Journal, the Monthly Notices of the Royal Astronomical ...
Astronomical Phenomena for the Year 2018 Astronomical Phenomena for the Year 2018. ... Astronomical Almanac for the Year 2015 and Its Companion, The Astronomical Almanac Online: Data for Astronomy, Space Sciences, ... Astronomical Almanac for the Year 2015 and Its Companion, The Astronomical Almanac Online: Data for Astronomy, Space Sciences, ... Astronomical Almanac for the Year 2013 and Its Companion the Astronomical Almanac Online. ...
  • The Quito Astronomical Observatory (Spanish: Observatorio Astronómico de Quito - OAQ) is a research institute of EPN, the National Polytechnic School in Quito, Ecuador. (wikipedia.org)
  • 1] The Quito Astronomical Observatory is one of the oldest observatories in South America and was founded in 1873. (wikipedia.org)
  • The Quito Astronomical Observatory is the National Observatory of Ecuador and is located 12 minutes south of the Equator in the Historic Center of Quito. (wikipedia.org)
  • The Quito Astronomical Observatory was founded in 1873. (wikipedia.org)
  • The Museum of the Quito Astronomical Observatory is located in La Alameda park and gives each visitor a vivid history of the various scientific instruments that were used by early astronomers and scientists. (wikipedia.org)
  • The Astronomical Observatory of Quito is one of the oldest in Latin America, and is a major attraction for scientists, students and tourists in Ecuador. (wikipedia.org)
  • The Quito Astronomical Observatory has been perfectly restored and is open for tourists. (wikipedia.org)
  • The activities and services currently provided by the OAQ are: Night observations by telescopes Astronomical information on the equatorial zone Basic astronomy courses Library Operation of the museum on the premises Annual publications Antique seismometers List of observatories One of the Oldest Observatories in South America is the Quito Astronomical Observatory Hans J. Haubold (19 April 2014). (wikipedia.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)
  • 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 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)
  • 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)
  • Destin has a great knowledge of both astronomy and photography, but this phenomenon got him so confused that he turned to the community for help. (diyphotography.net)
  • The zodiacal light is a very rare astronomical phenomenon. (space.com)
  • Tonight we will witness a rare astronomical phenomena called " supermoon" total lunar eclipse . (diyphotography.net)
  • 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 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)
  • Reprinted from the Explanatory Supplement to the Astronomical Almanac , P. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA 94965. (nasa.gov)
  • With simple stone technology, these wonderful people captured a very significant astronomical and calendrical moment in the most spectacular way. (mythicalireland.com)
  • discussed Galileo's telescopic discoveries ( Dissertatio cum nuncio sidereo ), and composed his most significant astronomical work, the Astronomia nova (=AN), which contains his first two laws of planetary motion. (stanford.edu)
  • Astronomical observatories were built and designed to map celestial events throughout the year. (crystalinks.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)
  • Quantum phenomena, wave-particle duality and the uncertainty principle. (oup.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)
  • 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)
  • 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)
  • Nevertheless, there are secular phenomena which cannot adequately be considered by ephemerides. (wikipedia.org)
  • from Latin ephemeris, meaning 'diary', from Greek εφημερίς (ephemeris), meaning 'diary, journal' ) gives the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times. (wikipedia.org)
  • The astronomical position calculated from an ephemeris is given in the spherical polar coordinate system of right ascension and declination. (wikipedia.org)
  • Morphogenesis is not only a biological phenomenon, but is also physical, geological, astronomical and even sociological. (utoronto.ca)
  • 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)
  • 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 has constructed astronomical experiments which exhibit the full range of gravitational phenomena. (aps.org)
  • The bending of light by gravity can lead to the phenomenon of gravitational lensing, in which multiple images of the same distant astronomical object are visible in the sky. (wikipedia.org)
  • 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)
  • Because of this, scientists who study atmospheric optical phenomena classify them as 60-degree or 90-degree phenomena. (timeanddate.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)
  • Scientists still don't know exactly what's going on, but they attribute the phenomenon to an enigmatic thing called dark energy. (nationalgeographic.com)
  • 12 Which of the following are phenomena associated with electromagnetic cascades? (wikiversity.org)
  • 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)
  • Last but not least: the solstice is a fundamentally difficult astronomical phenomena to measure. (slashdot.org)
  • How can an astronomical object of such crucial cosmological importance remain so fundamentally mysterious? (nationalgeographic.com)
  • 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)
  • After factoring out the direct astronomical tide, the researchers found the shift in the shape of the Earth triggered by the North Sea also influenced the loch's tide, much as an unstable table would tilt the water level in a bowl sitting atop it. (livescience.com)
  • 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)
  • An intensive survey deep into the universe by NASA's Hubble and Spitzer space telescopes has yielded the proverbial needle-in-a-haystack: the farthest galaxy yet seen in an image that has been stretched and amplified by a phenomenon called gravitatio. (newswise.com)
  • Astronomical telescopes, adaptive optics and aperture synthesis. (oup.com)
  • 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)
  • But can emergent gravity really challenge dark matter for explaining the full suite of astronomical phenomena in the Universe? (scienceblogs.com)
  • Could there be a deeper connection between the nature of black holes and their role in the universe and the phenomenon of life? (tor.com)
  • 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)
  • 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)
  • Here I develop a Bayesian method for this problem in which impacts are treated as a stochastic phenomenon. (wiley.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)
  • 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)
  • An introduction to the evolution of physical theories and models of natural phenomena from ancient Greece to modern times. (dartmouth.edu)
  • 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)
  • 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)
  • Massive astronomical objects are frequently encircled by groups of smaller objects that revolve around them, like the planets around the sun. (caltech.edu)
  • Chapter 7: Covariance of Maxwell's equations in material media and its application to phenomena such as the Doppler effect. (doverpublications.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 work, done by Konstantin Batygin (MS '10, PhD '12), a Caltech assistant professor of planetary science and Van Nuys Page Scholar, is described in a paper appearing in the March 5 issue of Monthly Notices of the Royal Astronomical Society . (caltech.edu)
  • 20 years ago, Ted Jacobson proposed, after noting similarities between gravitation and thermodynamics, that gravity might be an emergent phenomenon. (scienceblogs.com)
  • Learners will understand the astronomical phenomenon of solstice. (polartrec.com)
  • The astronomical rarity, three lunar phenomena occurring simultaneously, is the first of it's kind in 150 years. (themorningbulletin.com.au)
  • Many of these explanations assume that we just happen to be simultaneously viewing multiple short-lived astronomical phenomena. (icr.org)
  • A single hypothesis that can simultaneously explain multiple phenomena is more likely to be correct than multiple hypotheses needed to explain those same phenomena. (icr.org)
  • 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)
  • There is ample evidence that the intense radiation emitted by certain kinds of astronomical objects is due to black holes. (wikipedia.org)
  • The phenomena observed are located in the heavens, far beyond the reach, let alone control, of the astronomical observer. (wikiversity.org)
  • The "astronomical tide" from the heavens shifts the weight of the waters of that sea enough to deform the seafloor. (livescience.com)
  • Other proposed explanations for the persistence of these phenomena are also problematic. (icr.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)
  • 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)
  • Nature" refers to the phenomena of the physical world, and also to life in general. (absoluteastronomy.com)
  • Rather (after some epistemological considerations concerning the concepts of space and time) those physical phenomena shall be discussed, which could contribute to an experimental test of this principle. (wikisource.org)
  • Chapter 5: Wave aspects of radio-astronomical antenna theory. (doverpublications.com)
  • In our description of nature the purpose is not to disclose the real essence of the phenomena but only to track down, as far as possible, relations between the manifold aspects of our experience. (scienceblogs.com)
  • 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)
  • Our obsession with time and measuring it takes us from astronomical water clocks to pendulums to crystalline quartz, and atomic clocks. (wired.com)
  • Hip Hop on Film: Performance Culture,: essentials in this network are instead used, actions, really complex essences, and may extremely Work from long-term phenomena. (autumndewilde.com)
  • 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)
  • Gleick says today's resulting retro 'snob appeal in a nostalgic sense of craftsmanship' explains the whole Rolex phenomenon. (wired.com)
  • 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)
  • 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)
  • 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)
  • 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)