Practice Guidelines as Topic: 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.Editorial Policies: The guidelines and policy statements set forth by the editor(s) or editorial board of a publication.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Publications: 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)Hepatitis, Infectious Canine: 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.African Americans: Persons living in the United States having origins in any of the black groups of Africa.Publishing: "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.Science: The study of natural phenomena by observation, measurement, and experimentation.Bibliometrics: The use of statistical methods in the analysis of a body of literature to reveal the historical development of subject fields and patterns of authorship, publication, and use. Formerly called statistical bibliography. (from The ALA Glossary of Library and Information Science, 1983)Journal Impact Factor: A quantitative measure of the frequency on average with which articles in a journal have been cited in a given period of time.Military Medicine: The practice of medicine as applied to special circumstances associated with military operations.Military Personnel: Persons including soldiers involved with the armed forces.United States Department of Defense: 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.War: Hostile conflict between organized groups of people.United States Government Agencies: Agencies of the FEDERAL GOVERNMENT of the United States.AfghanistanGovernment Agencies: Administrative units of government responsible for policy making and management of governmental activities.Security Measures: Regulations to assure protection of property and equipment.Military ScienceEmergency Service, Hospital: Hospital department responsible for the administration and provision of immediate medical or surgical care to the emergency patient.Astronomy: 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)Astronomical Phenomena: Aggregates of matter in outer space, such as stars, planets, comets, etc. and the properties and processes they undergo.History, 20th Century: Time period from 1901 through 2000 of the common era.Prince Edward Island: 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)Sister Mary Joseph's Nodule: Metastatic lesion of the UMBILICUS associated with intra-abdominal neoplasms especially of the GASTROINTESTINAL TRACT or OVARY.History, 19th Century: Time period from 1801 through 1900 of the common era.Umbilicus: The pit in the center of the ABDOMINAL WALL marking the point where the UMBILICAL CORD entered in the FETUS.Encephalitis, St. Louis: A viral encephalitis caused by the St. Louis encephalitis virus (ENCEPHALITIS VIRUS, ST. LOUIS), a FLAVIVIRUS. It is transmitted to humans and other vertebrates primarily by mosquitoes of the genus CULEX. The primary animal vectors are wild birds and the disorder is endemic to the midwestern and southeastern United States. Infections may be limited to an influenza-like illness or present as an ASEPTIC MENINGITIS or ENCEPHALITIS. Clinical manifestations of the encephalitic presentation may include SEIZURES, lethargy, MYOCLONUS, focal neurologic signs, COMA, and DEATH. (From Adams et al., Principles of Neurology, 6th ed, p750)HistoryEncephalitis Virus, St. Louis: A species of FLAVIVIRUS, one of the Japanese encephalitis virus group (ENCEPHALITIS VIRUSES, JAPANESE), which is the etiologic agent of ST. LOUIS ENCEPHALITIS in the United States, the Caribbean, and Central and South America.Planets: Celestial bodies orbiting around the sun or other stars.Mercury: A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.Earth (Planet): Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.GermanyMercury PoisoningEvolution, Planetary: Creation and development of bodies within solar systems, includes study of early planetary geology.Ancient Lands: Geographical sites known to be extant in a remote period in the history of civilization, familiar as the names of ancient countries and empires.Stars, Celestial: Large bodies consisting of self-luminous gas held together by their own gravity. (From McGraw Hill Dictionary of Scientific and Technical Terms, 6th ed)Exobiology: The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.Encyclopedias as Topic: 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)ColoradoRussiaPhysics: The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)WyomingEncyclopediasFamous PersonsPulmonary Disease, Chronic Obstructive: A disease of chronic diffuse irreversible airflow obstruction. Subcategories of COPD include CHRONIC BRONCHITIS and PULMONARY EMPHYSEMA.Holidays: Days commemorating events. Holidays also include vacation periods.Anniversaries and Special Events: Occasions to commemorate an event or occasions designated for a specific purpose.Seasons: Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Melatonin: A biogenic amine that is found in animals and plants. In mammals, melatonin is produced by the PINEAL GLAND. Its secretion increases in darkness and decreases during exposure to light. Melatonin is implicated in the regulation of SLEEP, mood, and REPRODUCTION. Melatonin is also an effective antioxidant.Reproduction: The total process by which organisms produce offspring. (Stedman, 25th ed)Luteinizing Hormone: A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity.Light: That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.Photoperiod: The time period of daily exposure that an organism receives from daylight or artificial light. It is believed that photoperiodic responses may affect the control of energy balance and thermoregulation.Macropodidae: A family of herbivorous leaping MAMMALS of Australia, New Guinea, and adjacent islands. Members include kangaroos, wallabies, quokkas, and wallaroos.Hylobates: A genus of the family HYLOBATIDAE consisting of six species. The members of this genus inhabit rain forests in southeast Asia. They are arboreal and differ from other anthropoids in the great length of their arms and very slender bodies and limbs. Their major means of locomotion is by swinging from branch to branch by their arms. Hylobates means dweller in the trees. Some authors refer to Symphalangus and Nomascus as Hylobates. The six genera include: H. concolor (crested or black gibbon), H. hoolock (Hoolock gibbon), H. klossii (Kloss's gibbon; dwarf siamang), H. lar (common gibbon), H. pileatus (pileated gibbon), and H. syndactylus (siamang). H. lar is also known as H. agilis (lar gibbon), H. moloch (agile gibbon), and H. muelleri (silvery gibbon).

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)

*Spica

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). " ...

*Steve (atmospheric phenomenon)

"Introducing Steve - a newly discovered astronomical phenomenon". Googply News. 2017-04-24. Retrieved 2017-04-25. Eric Donovan's ... Space weather Thermosphere McRae, Mike (24 April 2017). "Introducing Steve - a Newly Discovered Astronomical Phenomenon". ... "Amateur Sky-Watchers Discover Celestial Phenomenon, Name It 'Steve'". 24 April 2017. "New atmospheric phenomenon named Steve ... As he correlated the time and location of the phenomenon with European Space Agency (ESA)'s Swarm satellite data, and Song ...

*Histoire Céleste Française

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 ...

*Ptolemy

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), ...

*Sun Circle (sculpture)

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 ...

*Maya astronomy

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. ...

*Pinsoro

... 's observatory is a useful place to see astronomical phenomena. San Isidro Festivals: in spring, the week of 15 May. San ...

*Tidal range

Tidal data is based on astronomical phenomena and is predictable. Storm force winds blowing from a steady direction for a ...

*Swarm (spacecraft)

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 ...

*Transient lunar phenomenon

... astronomical seeing blur and light scattering by our atmosphere to determine if these phenomena could explain some of the ... A transient lunar phenomenon (TLP) or lunar transient phenomenon (LTP) is a short-lived light, color, or change in appearance ... Explanations for the transient lunar phenomena fall in four classes: outgassing, impact events, electrostatic phenomena, and ... This description appears outlandish perhaps due to lacking public understanding of astronomical phenomena. In 1976, Jack ...

*Gravitational microlensing

... is an astronomical phenomenon due to the gravitational lens effect. It can be used to detect objects ... Thus, unlike with strong and weak gravitational lenses, a microlensing event is a transient phenomenon from a human timescale ... Because of the unlikely alignment required, he concluded that "there is no great chance of observing this phenomenon". ... Bohdan Paczyński first used the term "microlensing" to describe this phenomenon. This type of microlensing is difficult to ...

*Almanac

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 ...

*Star of Bethlehem

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 ...

*Zhang Heng

... 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 ...

*Felipe de Zúñiga y Ontiveros

These octavo volumes contained information on eclipses and other astronomical phenomena. In 1767 he began publishing Guía de ...

*Transit of Venus

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. ...

*Middelburg

Another astronomical phenomenon is the Aurora Borealis (Northern Lights). These in fact occur every year on a few days, but ...

*Physics in the medieval Islamic world

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 ...

*Astronomy on Mars

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 ...

*Integrated Flux Nebula

... s are a relatively recently identified astronomical phenomenon. In contrast to the typical and well known ...

*IAU Circular

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 ...

*Clock tower

Albans, in 1326, 'showed various astronomical phenomena'. Al-Jazari constructed an elaborate clock and described it in his Book ... In Song China, an astronomical clock tower was designed by Su Song and erected at Kaifeng in 1088, featuring a liquid ...

*Giovanni Valentini (artist)

Valentini also used programming language to realize images showing stars, planets and astronomical phenomena's scenery. In 1964 ...

*Astrarium

With such presentations as 'The history of the Universe', as well as other astronomical phenomena. Astronomical clock ... It is an astronomical clock. The first astraria were mechanical devices. Archimedes is said to have used a primitive version ... De' Dondi was inspired by his father Jacopo who designed the astronomical clock in the Piazzi dei Signori, Padua, in 1344 - one ... An astrarium, also called a planetarium, is the mechanical representation of the cyclic nature of astronomical objects in one ...

*Babylonian astronomy

626 BC). The Babylonians were the first to recognize that astronomical phenomena are periodic and apply mathematics to their ... Most known astronomical tablets have been described by Abraham Sachs and later published by Otto Neugebauer in the Astronomical ... "the first and highly successful attempt at giving a refined mathematical description of astronomical phenomena" and that "all ... The systematic records of ominous phenomena in Babylonian astronomical diaries that began at this time allowed for the ...

*2014-15 North American winter

Based on the astronomical definition, winter begins at the winter solstice, which in 2014 occurred on December 21, and ends at ... A quasi-permanent phenomenon referred to as the polar vortex may have been partly responsible for the cold weather. ... Astronomical Seasons". National Centers for Environmental Information. National Centers for Environmental Information (NOAA/NWS ... While both the meteorological and astronomical definitions of winter involve the onset of winter occurring in December, many ...
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, Lucy 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. ...
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 ...
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
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.. ...
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 ...
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 ...
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. ...
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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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 ...
Stars in the asymptotic giant branch (AGB) are in the penultimate stage of their lives as low- mass dwarfs. During this stage, they produce in their cool, bloated envelopes vast quantities of dust composed from metals ...
Using the decade-long data, astronomers are looking to determine how black holes merge, how mergers impact the evolution of galaxies, and how they can find other binary pairs in the universe.. Astronomers said that the two supermassive black holes theyve detected are the largest found in the universe. They said that if the pair merged, it would produce the most powerful gravitational burst in the universe.. While the predicted collision between the two black holes promises to be an event of cosmic proportions, it doesnt look like its going to happen before the estimated end of the universe, which is why researchers responsible for the study are hoping their discovery will inspire others to find other binary systems that are closer together. By observing an actual merger of two supermassive blackholes, scientists may yield data that can be applied to a more human timescale.. "I would sure be happy if we could find a system that completed orbit within a few decades so you could really see the ...
The Bad Astronomer writes NASAs NuSTAR satellite, designed to detect cosmic X-rays, detected a flare of high-energy emission coming from the Milky Way galaxys central supermassive black hole. The X-rays were the dying gasp of a small gas cloud being torn apart, heated to a hundred million degree...
A new estimate of the age of our Milky Way Galaxy suggests it was an original member of the universe, having been born just about as early on as was possible.
Twin stars appear to share chemical DNA that could help scientists map the history of the Milky Way galaxy, according to new research by astronomer Keith Hawkins of The University of Texas at Austin accepted for publication ...
If the universe is to be flat, there must be an additional component making up 74% (in addition to the 22% dark matter and 4% baryons) of the energy density of the universe. This is called dark energy. In order not to interfere with big bang nucleosynthesis and the cosmic microwave background, it must not cluster in haloes like baryons and dark matter. There is strong observational evidence for dark energy, as the total mass of the universe is known, since it is measured to be flat, but the amount of clustering matter is tightly measured, and is much less than this. The case for dark energy was strengthened in 1999, when measurements demonstrated that the expansion of the universe has begun to gradually accelerate.. However, apart from its density and its clustering properties, nothing is known about dark energy. Quantum field theory predicts a ...
Where do most of the elements essential for life on Earth come from? The answer: inside the furnaces of stars and the explosions that mark the end of some stars lives.. Astronomers have long studied exploded stars and their remains - known as "supernova remnants" - to better understand exactly how stars produce and then disseminate many of the elements observed on Earth, and in the cosmos at large.. Due to its unique evolutionary status, Cassiopeia A (Cas A) is one of the most intensely studied of these supernova remnants. A new image from NASAs Chandra X-ray Observatory shows the location of different elements in the remains of the explosion: silicon (red), sulfur (yellow), calcium (green) and iron (purple). Each of these elements produces X-rays within narrow energy ranges, allowing maps of their location to be created. The blast wave from the explosion is seen as the blue outer ring.. X-ray telescopes such as Chandra are important to study supernova remnants and the elements they produce ...
According to scientists, our Milky Way Galaxy has a super massive black hole at her center. We have all seen the science fiction movies where the space ship gets too close to this black hole and gets sucked in. The theory is that matter gets sucked in, and who knows where it ends up after that. What we as cosmic voyagers are really interested in is the higher dimensional structure here. Instead of a 3rd dimensional black hole, we have a stargate or portal in that location. If you travel into this stargate, you will find yourself in a vast space that is a transition zone of sorts. There is a lot going on here. For example, I have encountered large ethereal beings who call themselves the Time Lords. Their job is to hold the structure of time in place. Interestingly enough, the last few times I have encountered them, they seem to be dissolving from the bottom up. Does this mean that we are moving into a time of no time? ...
In this thesis we aim to develop new perspectives on the statistical mechanics of black holes using an information geometric approach (Ruppeiner and Weinhold geometry). The Ruppeiner metric is defined as a Hessian matrix on a Gibbs surface, and provides a geometric description of thermodynamic systems in equilibrium. This Ruppeiner geometry exhibits physically suggestive features; a flat Ruppeiner metric for systems with no interactions i.e. the ideal gas, and curvature singularities signaling critical behavior(s) of the system. We construct a flatness theorem based on the scaling property of the black holes, which proves to be useful in many cases. Another thermodynamic geometry known as the Weinhold geometry is defined as the Hessian of internal energy and is conformally related to the Ruppeiner metric with the systems temperature as a conformal factor.. We investigate a number of black hole families in various gravity theories. Our findings are briefly summarized as follows: the ...
Black holes are so far removed from what we can see and test, that they are the playground of mathematicians and theoretical physicists. This month Stephen Hawking, the king of black hole physics, published a paper stating that black holes have hairs. This challenges the notion that blackholes destroy everything that enters them completely, leaving a shadow of what might have entered at the event horizon.
A joint Guelph-Waterloo Gravity Group/Perimeter Institute Seminar --------------------------------------------------------------------------- Observational evidence suggests that the large scale dynamics of the universe is presently dominated by dark energy, meaning a non-luminous cosmological constituent with a negative value of the pressure to density ratio w, which would be unstable if purely fluid, but could be stable if effectively solid with sufficient rigidity.
A Caltech-built instrument designed to study the mysteries of the cosmic web-streams of gas connecting galaxies-has captured its first image, an event astronomers call "first light." The instrument, called the Keck Cosmic Web Imager, or KCWI, was recently installed on the W. M. Keck Observatory in Hawaii.. KCWI captures highly detailed spectral images of cosmic objects to reveal their temperature, motion, density, mass, distance, chemical composition, and more. The instrument is designed to study the wispy cosmic web; it will also observe many other astronomical phenomena, including young stars, evolved stars, supernovas, star clusters, and galaxies.. "Im incredibly excited. These moments happen only a few times in ones life as a scientist," says principal investigator Christopher Martin, professor of physics at Caltech. "To take a powerful new instrument, a tool for looking at the universe in a completely novel way, and install it at the greatest observatory in the world is a dream for an ...
In 1987 a star was observed exploding, and designated Supernova 1987A. It was in a galaxy accepted as being about 170,000 light-years from earth. There have been many observed supernovas throughout history, and supernovas do not demolish young earth creationism. We can see an enormous number of stars that are so far away from us that it would take millions or billions of years for their light to reach us. The argument relating to SN1987A is the same as the general argument over distant starlight. Indeed, those who believe in the big bang origin of the Universe have a problem with the amount of time available for light to travel as well.. For a good overview of the distant starlight issue, using SN1987A as a specific example, see the first few paragraphs of: Distant starlight and Genesis: conventions of time measurement. Chapter 5 of the Creation Answers Book also deals with the issue, discussing the role of gravity in explaining how we can see distant starlight in an earth time frame of ...
It has been suggested that globular star clusters may host a black hole with intermediate mass (~ a few à 1000 M_sun ) or a collection of low mass (~ 10 M_sun ) black holes at their centre. High velocity dispersion in the cluster core and the presence of the ultra-luminous X-ray sources at the clusters centre are thought to be signatures of black holes. However, only indirect and/or inconclusive evidences exists for the presence of black hole in the core of globular clusters. Stars passing very close to the black hole in a cluster can, under certain circumstances, be accelerated to a much higher velocity than the cluster dispersion. Such high proper motion of the stars in the sphere of influence of the black hole can be detected using multi-epoch images of globular cluster separated by reasonable baseline. The variation in proper motion dispersion with radial distance from the cluster centre can give an indication of the presence (or absence) of a central black hole. To resol... ...
An international team of astronomers have created the longest consistent 3D model of a neutrino-driven supernova explosion to date, helping scientists to better understand the violent deaths of massive stars.. The research, conducted using supercomputers in Australia, Germany, and the DiRAC facility in the UK, is published in the journal Monthly Notices of the Royal Astronomical Society.. The largest explosions in the universe, so-called supernovae, occur when stars many times larger than our own Sun reach the end of their lives and exhaust the nuclear fuel at their centres. At this point the innermost part of the star, an iron core itself about 1.5 times as massive as the Sun, succumbs to gravity and collapses to an ultra-dense neutron star within a fraction of a second.. In the process, the outer layers of the star are expelled in a gigantic supernova explosion, which ejects material at velocities of thousands of kilometres per second. Such supernovae are regularly observed in distant ...
A group of scientists led by researchers at Cardiff University have discovered a rich inventory of molecules at the centre of an exploded star for the very first time.. Two previously undetected molecules, formylium (HCO+) and sulphur monoxide (SO), were found in the cooling aftermath of Supernova 1987A, located 163,000 light years away in a nearby neighbour of our own Milky Way galaxy. The explosion was originally witnessed in February 1987, hence its name.. These newly identified molecules were accompanied by previously detected compounds such as carbon monoxide (CO) and silicon oxide (SiO). The researchers estimate that about 1 in 1000 silicon atoms from the exploded star can be found in SiO molecules and only a few out of every million carbon atoms are in HCO+ molecules.. It was previously thought that the massive explosions of supernovae would completely destroy any molecules and dust that may have been already present.. However, the detection of these unexpected molecules suggests that the ...
GCl 38 is a globular cluster located in the constellation Hercules. It was discovered in 1958 by Sidney van den Bergh and Halton Arp during inspection of the photographic plates from the Palomar Sky Survey. This is a round, diffuse cluster located in the outer halo of the Milky Way galaxy. It is about 3-4 billion years younger than a typical galactic cluster. The metallicity of the cluster is [Fe/H] = −1.50, indicating a lower abundance of elements with mass greater that helium compared to the Sun. The combined mass of the main sequence stars in the cluster is 1340 ± 50 solar masses, and the combined mass of observed stars within the half-light radius is 6020 ± 50 solar masses. (This is the inner radius of the cluster that emits half the total luminosity.) These mass estimates provide lower bounds for determining the total mass of the cluster. The median radial velocity of stars within the cluster is 72.19 ± 0.18 km/s. Because of the clusters location on the outer fringes of the Milky Way, ...
Green spaces such as public parks are increasingly regarded as important correlates of cardiovascular health by the scientific community.1 This is based on mounting evidence not only from small-scale experiments,2 ,3 but also large observational studies.4-6 As a result, there is also rising interest among urban planning and health policy decision makers in the opportunities for constructing and targeting green spaces to make more liveable neighbourhoods that actively promote mental and cardiometabolic health, physical recreation and overall quality of life.7 ,8. A challenge with this wave of optimism, however, is the quality of the observational evidence underpinning it.9 The vast majority of studies have been cross-sectional, which means that putative interventions, such as an increase in the quantity or quality of green space available locally, cannot be rigorously evaluated for their impact on health. Even with multivariate adjustment for income and other factors which determine where a ...
Isnt that what I said? I gave him evidence, which he denied by falling back on a typological fallacy: the bacteria are still bacteria. What he refuses to recognize is that they were quantitatively different bacteria, physiologically and genetically. To say that something is still X, where X is an incredibly large and diverse group like fish and bacteria, is to deny variation and diversity, observable properties of the natural world which are the fundamental bedrock of evolutionary theory.. But the giveaway is that brief phrase "scientific evidence - observational evidence". Thats where the real sleight of hand occurs: both Comfort and Ham try to claim that that all the evidence for evolution doesnt count, because its not "observational". "Were you there?" they ask, meaning that the only evidence theyll accept is one where an eyewitness sees a complete transformation of one species to another. That is, they want the least reliable kind of evidence, for phenomena that are not visual. Theyre ...
|P|It is now widely accepted that there are important links between inactivity and lifestyle-related chronic diseases, and that exercise can bring tangible therapeutic benefits to people with long-term chronic conditions. |EM|Exercise and Chronic Disease: An Evidence-Based Approach|/EM| offers the most up-to-date survey currently available of the scientific and clinical evidence underlying the effects of exercise in relation to functional outcomes, disease-specific health-related outcomes and quality of life in patients with chronic disease conditions.|/P| |P|Drawing on data from randomized controlled trials and observational evidence, and written by a team of leading international researchers and medical and health practitioners, the book explores the evidence across a wide range of chronic diseases, including:|/P| |P||/P| |UL| |LI|cancer|/LI| |LI|heart disease|/LI| |LI|stroke|/LI| |LI|diabetes|/LI| |LI|parkinsons disease|/LI| |LI|multiple sclerosis|/LI| |LI|asthma.|/LI||/UL| |P|Each chapter addresses
Dr. Simmons said this research will provide the first observational evidence linking mitochondrial DNA release to the evolution of local and distant organ failure in patients after infection. It will also assist in identifying isolated targets for pharmacologic intervention in ventilator associated pneumonia - a type of hospital-acquired pneumonia that occurs in people who are receiving mechanical ventilation - and will provide the evidence necessary to immediately start clinical trials with a medication that is already approved by the FDA for the prevention of pneumonia ...
There is animal and human observational evidence to suggest that vitamin D and calcium are important in modifying t2DM risk but there are critical gaps in our knowledge about the clinical magnitude of the association with t2DM and potential mechanisms in humans. We are conducting a randomized trial to quantify the effect of vitamin D and calcium supplementation on beta-cell function, insulin sensitivity, glucose tolerance and systemic inflammation and other cardiometabolic outcomes in ambulatory adults at high risk for t2DM. We anticipate that the research proposed in this application is significant because it will provide the basis for defining feasible nutritional interventions that promotes prevention of t2DM. Based on the results of the proposed studies and future work in this area, vitamin D and calcium supplementation can assume an important role in the treatment of t2DM and in the prevention of the disease in the 41 million Americans who are at risk of developing t2DM ...
There is no compelling evidence to the effect that the teen brain is any different today than it was in the 1950s, when the brilliantly intuitive Swiss psychologist Jean Piaget, proposed (on the basis of much observational evidence) that teens as young as 12 were very capable of rational, logical thought.
Systematic review: PSD is common among stroke survivors: it occurs in about 10% of the survivors after first stroke and about 30% after recurrent stroke, with the prevalence ranging from 7% to 67%, depending on the population and diagnosis criteria. There is some observational evidence suggesting that blood lipids and atherosclerosis are associated with cognitive decline and dementia in general population. However, substantial uncertainty about such association exists in the stroke survivors. Randomised evidence is also very limited for the effect of statins (the first-line lipid-lowering treatment) on preventing PSCI/PSD. We will include cohort study and randomised controlled trial, regardless of study time, location, settings, data sources, sample size, study quality, length of follow-up, confounders adjusted and publication language. While we include RCTs mainly for the third objective, if the association of blood lipids and atherosclerosis (recorded at baseline before the start of the assigned
Poor nutrition during pregnancy is a significant contributor to maternal morbidity and a leading cause of childhood mortality and morbidity worldwide. There is universal recognition of the importance of the The First Thousand Days for physical growth and, when linear growth fails during this window of opportunity, for associated concurrent and future morbidity and mortality [1-3]. Sub-optimal nutrition is widely regarded as the most important etiologic factor contributing to impaired linear growth in poor communities worldwide. However, multiple nutrition interventions, whether maternal following identification of pregnancy, or offspring , 2 years of age have overall met with only partial success [4]. Typically, however, maternal intervention trials have not begun in the first trimester or/and the periconceptional period despite observational evidence of a relationship between poor maternal nutrition at conception and LBW first reported a quarter of a century ago [5]. A series of ...
The Ebola virus may leave a retinal scar specific to the disease, according to researchers. "The distribution of these retinal scars or lesions provides the first observational evidence that the virus enters the eye via the optic nerve to reach the retina in a similar way to West Nile virus," said Dr Paul Steptoe of the Royal Liverpool Hospital, in a press release. ...
Looking for Galactic co-ordinate? Find out information about Galactic co-ordinate. astronomical coordinate system astronomical coordinate systems. A coordinate system is a method of indicating positions. Each coordinate is a quantity... Explanation of Galactic co-ordinate
Astronomers using two X-ray space observatories, NASAs Nuclear Spectroscopic Telescope Array (NuSTAR) and the European Space Agencys XMM-Newton, have teamed up to measure definitively, for the first time, the spin rate of a black hole. They determined that the supermassive black hole at the center of the galaxy NGC 1365 is spinning almost as fast as Einsteins theory of gravity will allow. The spin rate of a black hole tells a lot about how it formed. Fast spinning black holes formed quickly, while slower ones formed more slowly. These recent observations, reported in Nature, lean on the fact that as a black hole consumes mass, the process emits X-radiation from the inner edge of the accretion disc. Fast spinning black holes will have X-ray emissions that are more gravity-effected, i.e., red-shifted, than those from slow spinning ones. But the X-rays are scattered and obscured by the disc itself, so astronomers have to discern red-shift due to the effects of spinning rate, from those due to ...
By Dr David Whitehouse BBC News Online science editor For the first time scientists have seen two supermassive black holes existing together at the core of the same galaxy. The black holes are orbiting
Figure 6: Table recapitulating historical supernovae blasts from the past. (Source).. References and resources. Allel, Chama, "Lenseignement medical au Caire au moyen âge à travers un traité médical arabe dIbn Ridwan". Online here.. Burnham, R., Burnhams Celestial Handbook, New York, Dover Publications, 1978, p. 1117.. Clark, David H., Stephenson F. Richard, The Historical Supernovae. New edition, Oxford: Oxford University Press, 2002.. Donsbach, Margaret, "The Scholars Supernova", in Saudi Aramco World, July/August 2006, pp. 38-43. Online here.. Ibn-Ridwan. Medieval Islamic Medicine: Ibn-Ridwans Treatise "On the Prevention of Bodily Ills in Egypt." Translated with introduction by Michael W. Dols. Arabic text by Adil S. Gamal. Berkeley, CA.: University of California Press, 1984.. Long, K., Blair, W.P., 1988, "An Improved Proper Motion Measurement of SN 1006, Astrophysical Journal, vol. 333, p. 749.. "Monday, April 30, 2007: The Heavenly Messenger of 1006. 1001 years ago tonight...". ...
The Heart 2 Part Chamber Soap Mold is constructed of plastic and features two different long hearts. One is a plain heart while the other has a sunburst feature radiating from the inner heart. Create soaps or lotion bars for special occasions such as Valentines Day, Mothers Day and Fathers Day with this Milky Way mold.
If neutral clouds at a typical pressure were left alone until they could reach an equilibrium state, they could exist at either of two temperatures: "cold" (about 80 K) or "warm" (about 8,000 K), both determined by the balance of heating and cooling rates. There should be little material in between. Observations show that these cold and warm clouds do exist, but roughly half the material is in clouds at intermediate temperatures, which implies that turbulence and collisions between clouds can prevent the equilibrium states from being reached. Cold H I regions are heated by electrons ejected from the dust grains by interstellar ultraviolet radiation incident upon such a cloud from outside. Cooling is mainly by C+ because passing electrons or hydrogen atoms can excite it from its normal energy state, the lowest, to one slightly higher, which is then followed by emission of radiation at 158 micrometres. This line is observed to be very strong in the spectrum of the Milky Way Galaxy as a whole, ...
The Milky Way Galaxy (our galaxy!) is a barred spiral galaxy around 100,000- 120,000 light years across, containing maybe up 400,000 billion stars! Thats a lot of stars! It may contain just as many planets and our dolor system resides within the disk, about 2/3rds of the way out from the galac
FAQ: In the very distant future, will all matter be converted into black holes and then photons?. No. There is a misconception that a lot of laypeople seem to be picking up recently from popularizations, which is that all the matter in the universe will first be sucked into black holes, and then recycled into photons in the distant future through Hawking radiation, so that the only thing left will be photons. This is wrong.. First lets talk about the black hole part. Physicists have done detailed calculations of this kind of thing. Black holes are not super-powerful cosmic vacuum cleaners that can suck in everything there is. When a black hole forms through gravitational collapse, such as the collapse of a dying star, its mass stays the same, and that means that at some fixed distance such as a billion kilometers, its gravity is no stronger than it used to be. A black hole is in fact a very small object, typically about the size of a city. This makes it a small target, and the space between the ...
Whats dark and so massive that not even light can escape its clutches? The answer is one of the most enigmatic phenomena known to physics: the black hole. And this week we explore the workings of these mysterious entities from how they distort time and what what would happen if you fell into one, to why black holes power the brightest lights in the Universe and how scientists are trying to image their interior. Plus, news of a dissolving brain implant, how ultrasound might be making some people sick, and why a real-life spider-man would have to be really, really small...
Black Hole Star / Tales From the Blue Cocoons is a music boxset/compilation recording by NEUTRONS (Eclectic Prog/Progressive Rock) released in 2003 on cd, lp / vinyl and/or cassette. This page includes Black Hole Star / Tales From the Blue Cocoonss : cover picture, songs / tracks list, members/musicians and line-up, different releases details, free MP3 download (stream), buy online links: ebay and amazon, ratings and detailled reviews by our experts, collaborators and members.
reports. In a study published in Solar and Stellar Astrophysics, the researchers say they saw the red supergiant star N6946-BH1 flare a million times brighter than our sun for several months in 2009 before fading out of visible wavelengths, a likely sign of a brand-new black hole. If this is indeed such an event, it could provide valuable data about black hole life cycles. The researchers will try to confirm this theory over the next few months by searching for the x-ray traces of matter falling into the new hole.. ...
[email protected]/?details=1. Quatum Function Follows Form ( Q-FFF model) Basics. I think that Stephen Hawking did not calculate with the possibility of a chiral oscillating Higgs field vacuum lattice combined with propeller shaped Fermions. Then, due to Vacuum chirality, Electron- and Positron propellers could both pushed away from the BH horizon after spin flip polarization at different distances, forming two charged separated spheres. With quark ( plasma) formation in between. Based on such a simple object ( propeller and process) oriented ontology, Black Holes could be imagined as charge splitters violating the 2e law af thermodynamics, combined with a continuous microscopic big bang plasma creation process!. The result I try to describe shortly:. 1: Black holes are the same as Dark Matter, they all consume photons, even gravitons and the Higgs field, but REPEL Fermions due to their propeller shape. They produce electric charged plasma.. 2: Dark Energy is the oscillating ( Casimir) energy of the ...
To this day I havent been able to understand why small black holes have higher temperature (and thus radiate more) than big black holes. I need a...
Several results in the context of quantum gravity and related frameworks suggest the plausibility of modifications to the uncertainty principle and to the energy-momentum dispersion relation of special relativity. One of these frameworks is provided by gravitys rainbow. We analyze the consequences that such modifications may have for black hole thermodynamics from the perspective of two different gravitys rainbow formalisms. In this scenario, we show that the temperature of the black hole may vanish in the limit of zero mass under feasible conditions ...
Chung-Pei Ma is both a gifted violinist and one of the worlds foremost black hole hunters. Watch online: S45 Ep1: Black Hole Hunter: Chung-Pei Ma from NOVA. On demand, streaming video from WVIA Public Media Studios
Abstract: Black holes whose near-horizon geometries are locally, but not necessarily globally, AdS$_3$ (three-dimensional anti-de Sitter space) are considered. Using the fact that quantum gravity on AdS$_3$ is a conformal field theory, we microscopically compute the black hole entropy from the asymptotic growth of states. Precise numerical agreement with the Bekenstein-Hawking area formula for the entropy is found. The result pertains to any consistent quantum theory of gravity, and does not use string theory or supersymmetry ...
Fishpond Australia, Black Hole Tariffs and Endogenous Policy Theory: Political Economy in General Equilibrium by William A Brock Stephen P Magee. Buy Books online: Black Hole Tariffs and Endogenous Policy Theory: Political Economy in General Equilibrium, 1989, ISBN 0521362474, William A. Brock Stephen P. Magee
Stephen Hawking provided a ground-breaking solution to one of the most mysterious aspects of black holes, called the "information paradox." Black holes look like they 'absorb'
Article: A Black Hole Between Neuroscience and Mental Illness - Despite the advances in neuroscience the care of mentally ill is ineffective and unscientific. There is, in essence, a black hole between neuroscience and mental illness.
Heat treatment of gemstones to is done to improve their appearance. Heat treatment may change the color of corundum for a variety of reasons. In some cases, heating the stone causes changes in the oxidation state of impurites. An especially important example involves reduction of Fe (conversion of Fe+++ to Fe++). Fe++ causes color in a variety of sapphires via charge transfer (see lecture on color in minerals). Conversely, stones that are too deeply blue may be lightened by oxidation of Fe (converstion of Fe++ to Fe+++) In some cases, heat treatment will improve the depth of color because heat causes dissolution of inclusions and diffusion of impurites (especially Ti from rutile inclusions) into the surrounding corundum. Because fine inclusions cause some stones to look cloudy, heat treatment that dissolves the inclusions may also improve the clarity of the stone. Heat treatment may also remove local color concentrations (remove patches of color) because heat allows the color-causing impurity ...
Ruby & Sapphire: Inclusions in the corundum gems, gemology of corundum, ruby inclusions, sapphire inclusions, Burma ruby & sapphire
Some galaxies emit excessive amounts of light from their centers, caused by accretion of gas onto super-massive black holes (SMBH). These galactic cores are often referred to as Active Galactic Nuclei (AGN) and they come in many different forms, distinguishable by their emission properties. The AGN classes fall into two major categories: those with narrow Balmer lines, and those with broad Balmer lines. The AGN Unification theory of radio-quiet AGN predicts the two classes to differ mainly in the viewing angle of the observer who may, or may not, see the central engine due to dust obscuration in the foreground.. In this PhD thesis, I explore the limits of the radio-quiet AGN Unification. In its most famous and simple form, the obscurer is a parsec-sized dust doughnut surrounding the accretion disk. I show that the galaxy neighbours to the two types of AGN are different, in disagreement with the simplest form of unification (Paper I). The two AGN classes differ in their [OIII]5007 luminosity, as ...
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ...
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ...
A shaft of sunlight illuminates the usually dark sanctum of the Karnak temple, in an astronomical phenomenon that happens twice a year, marking the winter solstice, the shortest day and longest night of the year in the northern hemisphere. On December 21, Egypt celebrates the winter solstice as thousands of tourists gather in the holy sanctuary of the Karnak Temple complex.
Besides the supernova, M82 harbors a number of other ULXs. When Matteo Bachetti of the Université de Toulouse in France, the lead author of this new paper, took a closer look at these ULXs in NuSTARs data, he discovered that something in the galaxy was pulsing, or flashing light.. "That was a big surprise," Harrison says. "For decades everybody has thought these ultraluminous X-ray sources had to be black holes. But black holes dont have a way to create this pulsing.". But pulsars do. They are like giant magnets that emit radiation from their magnetic poles. As they rotate, an outside observer with an X-ray telescope, situated at the right angle, would see flashes of powerful light as the beam swept periodically across the observers field of view, like a lighthouse beacon.. The reason most astronomers had assumed black holes were powering ULXs is that these X-ray sources are so incredibly bright. Black holes can be anywhere from 10 to billions of times the mass of the sun, making their ...
Supernova in the Galaxy M65 on 23 March, image taken with iTelescope T04, 5x120 second exposures stacked and registered in ImageJ then a SUM Z-project applied, followed by contrast adjustment and colour inversion. Supernova indicated by black bars (click to embiggen ...
We present a collection of classical, type II, and anomalous Cepheids detected in the OGLE fields toward the Galactic center. The sample contains 87 classical Cepheids pulsating in one, two or three radial modes, 924 type II Cepheids divided into BL Her, W Vir, peculiar W Vir, and RV Tau stars, and 20 anomalous Cepheids - first such objects found in the Galactic bulge. Additionally, we upgrade the OGLE Collection of RR Lyr stars in the Galactic bulge by adding 828 newly identified variables. For all Cepheids and RR Lyr stars, we publish time-series VI photometry obtained during the OGLE-IV project, from 2010 through 2017. ...
I reside on the 3rd planet that circles the Sun in the Milky Way Galaxy. 70% of my world consists of water but dont go drinking it!
New observations show that the jets of black hole 4U 1630-47 carry massive particles such as iron and nickel atoms instead of the typical low-mass particles such as electrons.
In 2152 the NX-01 Enterprise received information that the recent attack on Earth had been carried out by the Xindi, a species native to the Delphic Expanse.18 The ship spent almost ten months searching the area, and eventually managed to prevent a further attack.22 During the mission, Captain Archer learned that the Expanse was being maintained by a network of huge artificial spheres23 - at least 78 in all.24 The spheres were created deliberately in order to reconfigure the nature of space in the Milky Way galaxy to pave the way for an invasion by an alien species from another dimension.25 The various anomalies of the Expanse occurred where the intense gravimetric waves generated by different spheres interacted.26 These anomalies varied in type and effect; some merely interfered with artificial gravity fields in unusual ways23, others could be massvely damaging to any ship passing through them.27 ...
A beetle with a tiny brain appears to use the Milky Way galaxy for navigation, a feat that has never before been seen in an insect before, say scientists from South Africa and Sweden who made the discovery. Their report, appearing inCurrent Biology, shows that even on the darkest of nights, the African ball-rolling insects […]. ...
There is an infinite complexity to nature. From sea shells, to the Milky Way galaxy, to the structure of human lungs, there are patterns that exist in everything around us. London based collaborators Kai & Sunny (previously featured here) have always been drawn towards such images created by nature. Opening Saturday, they will exhibit six new ballpoint pen pieces in "The Matter of Time" at 886 Geary Gallery in San Francisco. A more vibrant palette is applied in their new drawings, alongside hand-pulled monochromatic screen prints on copper and paper. Their works magnify and stylize the things that are plainly visible to us but often overlooked. Here, this would be the turn of the tides, represented in energetic, abstract pieces. ...
Abstract: Generic extensions of the standard model predict the existence of ultralight bosonic degrees of freedom. Several ongoing experiments are aimed at detecting these particles or constraining their mass range. Here we show that massive vector fields around rotating black holes can give rise to a strong superradiant instability which extracts angular momentum from the hole. The observation of supermassive spinning black holes imposes limits on this mechanism. We show that current supermassive black hole spin estimates provide the tightest upper limits on the mass of the photon (mv,4x10^{-20} eV according to our most conservative estimate), and that spin measurements for the largest known supermassive black holes could further lower this bound to mv,10^{-22} eV. Our analysis relies on a novel framework to study perturbations of rotating Kerr black holes in the slow-rotation regime, that we developed up to second order in rotation, and that can be extended to other spacetime metrics and other ...
3! Do not know what to do here ah! ? Oh! Space systems trials ah so get! ? Longfei complained,evening dresses 2013, he was complaining about ah! A space systems actually in a black hole inside began to lose trials ah! Feis eyes have seen any of the stuff, but convinced that he still has his mental strength, his own spiritual power construct can be even better than the eye contempt satisfied sense of the hundreds of times eyes. Spiritual power opened in front of him all clear, this is not what a black hole ah! Where the world is a silver-white, good a silvery white world! No trees, no monster what! A quiet world exists, to doing here! ? The Longfei think bio? Wrong to pull! He was wrong Oh! Longfei Command Division know that there is a very strong energy of the space department, he immediately sat down to, he does not know is that although he saw with spiritual power that the black hole is an illusion, but he stayed inside a black hole! His bold, ah, to absorb the energy of the black hole ...
On February 23, 1987, a supernova, which is a vast star explosion, was observed. It was known as SN 1987A. About eight months after the explosion was observed, reflections from the explosion were seen in a distant gas cloud ring that circled the supernova. The ring can be seen as an orange circle in the photo above. The reason the reflected light was delayed eight months was that it took time for the light to travel from the supernova to the distant gas clouds and then to reflect from there back to earth. (See illustration below.) And so we can conclude that it took about eight months--or 0.66 years-- to journey from the supernova to the gas ring. Knowing the time it took to reach the ring, and knowing the speed of light, we can calculate the distance to the ring. Knowing this distance, and measuring the angle between the supernova and the reflection as seen from the earth, we can use simple trigonometry to calculate the distance of the supernova from the earth. Astronomers have calculated that ...
This is definitely a supernova worth continued following (now I find I should have been doing exposures with BVR filters). Again I urge people to submit their images (details here). Calibrated but otherwise unmodifed FITS images are best, but all images are welcome. Of course, with the Moon almsot full imaging will have to take a break for a while, but when we have some less Moon-haunted skies it will be interesting to see what this supernova will be doing ...
ESAs XMM-Newton has discovered that gas lurking within the Milky Ways halo reaches far hotter temperatures than previously thought and has a different chemical make-up than predicted, challenging our understanding of our galactic home.
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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 ...
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In the interstellar medium - the space between the stars in galaxies - new stars are born from material that is replenished by the debris ejected by stars when they die. This book is a comprehensive manual for studying the collisional and radiative processes observed in the interstellar medium. This second edition has been thoroughly updated and extended to cover related topics in radiation theory. It considers the chemistry of the interstellar medium both at the present epoch and in the early Universe, and discusses the physics and chemistry of shock waves. The methods of calculation of the rates of collisional excitation of interstellar molecules and atoms are explained, emphasising the quantum mechanical method. This book will be ideal for researchers involved in the interstellar medium and star formation, and physical chemists specialising in collision theory or in the measurement of the rates of collision processes.. • Comprehensive manual for studying collisional and radiative processes ...
TY - JOUR. T1 - Europa, tidally heated oceans, and habitable zones around giant planets. AU - Reynolds, Ray T.. AU - McKay, Christopher P.. AU - Kasting, James. PY - 1987/1/1. Y1 - 1987/1/1. N2 - Tidal dissipation in the satellites of a giant planet may provide sufficient heating to maintain an environment favorable to life on the satellite surface or just below a thin ice layer. In our own solar system, Europa, one of the Galilean satellites of Jupiter, could have a liquid ocean which may occasionally receive sunlight through cracks in the overlying ice shell. In such a case, sufficient solar energy could reach liquid water that organisms similar to those found under Antarctic ice could grow. In other solar systems, larger satellites with more significant heat flow could represent environments that are stable over an order of Aeons and in which life could perhaps evolve. We define a zone around a giant planet in which such satellites could exist as a tidally-heated habitable zone. This zone can ...
Then he found the ratio of terrestrial planets to all the planets seen. Again, remember, this ratio was found for planets somewhat close in to their stars.. Then he plotted all the planets versus distance from their parent stars. For example, you see very few planets very close to the star (probably because its hard to form or get a planet to orbit that close in), then more as you get farther out, then fewer at some large distance (which may, once again, simply be due to the fact that planets with long orbital periods cant be seen in the short duration of the data). He then found an equation (called a mathematical fit) that did a good job predicting the shape of the plot. Once he had that, its easy enough to extrapolate it out to the distance of the habitable zones of the stars.. That gave him an estimate of all planets orbiting there, including gas and ice giants. Multiply by the ratio of terrestrial planets, and boom! 34% of stars like the Sun should have planets that are Earth-sized ...
Associate Professor of History and Philosophy of Astronomy and Physical Science (retired). He was born in Athens, Greece on the 12th of March, 1949. He got his B.Sc. in Mathematics from the Aristotle University of Thessaloniki, Greece (1972) and his Ph.D. in Astrophysics from the Physics Department of the University of Athens, Greece (1983). He has worked as Laboratory Assistant, Lecturer and Assistant Professor at the Physics Department of the University of Athens. His scientific interests include History and Philosophy of Astronomy and Physical Sciences, Observational Astronomy and Astrophysics, Satellite spectrophotometry of Be and variable stars. He has published 43 scientific papers in refereed journals (14 in Astrophysics and 29 in History and Philosophy of Astronomy), 18 papers in the British Sundial Society Bulletin (BSB) and North American Sundial Society Bulletin (NASS) and 147 papers in conference proceedings in Greece and abroad (65 in Astrophysics and 82 in History and Philosophy of ...
A newly discovered exoplanet poses a radical challenge to the consensus theory of planet and star formation. The massive exoplanet is eleven times the size of Jupiter yet it circles its parent star at a distance that is 650X the average distance between the Earth and the Sun (versus Neptune which is 30X the average distance between the Earth and the Sun). In the conventional theory, which imagines stars forming gravitationally in a collapsing cloud of gas and dust, such a giant planet cannot form at such a vast distance from its star.[/quote ...
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Topic: Earth and space science, Astronomy, Size and scale, Earth and space science, Astronomy, Stars, nebulae and galaxies, Earth and space science, Earth processes, Climate, Earth and space science, Solar system, Asteroids and comets, Earth and space science, Solar system, Origin/formation of solar system, Earth and space science, Solar system, Planetary geology, Earth and space science, Solar system, Planetary science, Earth and space science, Solar system, Planets, Earth and space science, Solar system, The moon, Earth and space science, Solar system, The sun, Space weather, Engineering and technology, Remote sensing, Life sciences, Astrobiology, Mathematics, Physical sciences, States of matter, Physical sciences, Structure and properties of matter, The nature of science, The scientific process, The nature of technology, The design process ...

Leicester scientists describe astronomical phenomenon never witnessed before - University of LeicesterLeicester scientists describe astronomical phenomenon never witnessed before - University of Leicester

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 ...
more infohttps://le.ac.uk/news/2017/october/leicester-scientists-describe-2018astronomical-phenomenon-never-witnessed-before2019

August 02, 1851 - Scientific AmericanAugust 02, 1851 - Scientific American

Astronomical Phenomena. For the Scientific American. British Scientific Association, &C. Special Correspondence of the ...
more infohttps://www.scientificamerican.com/magazine/sa/1851/08-02/

ExploreLearning Gizmos: Math & Science SimulationsExploreLearning Gizmos: Math & Science Simulations

ES.C: Astronomical phenomena. ES.C.1: Concepts related to astronomy. ES.C.1.b: Earth-Moon system ...
more infohttps://www.explorelearning.com/index.cfm?method=cResource.dspStandardCorrelation&id=1870

February 26, 1848 - Scientific AmericanFebruary 26, 1848 - Scientific American

Astronomical Phenomenon. Artificial Stones. Wholesale Desertion of Wives and Families. A Human Divining Rod. ...
more infohttps://www.scientificamerican.com/magazine/sa/1848/02-26/

Department of Defense (DOD) | U.S. Government BookstoreDepartment of Defense (DOD) | U.S. Government Bookstore

Astronomical Phenomena for the year 2019 Astronomical Phenomena for the year 2019. ...
more infohttps://bookstore.gpo.gov/agency/department-defense-dod?page=0%2C3

viXra.org e-Print archive, AstrophysicsviXra.org e-Print archive, Astrophysics

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. ...
more infohttp://vixra.org/astro/1410

Kanawha River Navigation Charts: Point Pleasant to Alloy, West Virginia (2016) | U.S. Government BookstoreKanawha River Navigation Charts: Point Pleasant to Alloy, West Virginia (2016) | U.S. Government Bookstore

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. ...
more infohttps://bookstore.gpo.gov/products/kanawha-river-navigation-charts-point-pleasant-alloy-west-virginia-2016

United States Naval Observatory Nautical Almanac Office [WorldCat Identities]United States Naval Observatory Nautical Almanac Office [WorldCat Identities]

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 ...
more infohttp://worldcat.org/identities/lccn-n80-149744/

Best jobs if you love to be the center of attention - Business InsiderBest jobs if you love to be the center of attention - Business Insider

What they do: Observe, research, and interpret astronomical phenomena. Their work helps improve our basic knowledge of the ...
more infohttps://www.businessinsider.com/best-jobs-if-you-love-to-be-the-center-of-attention-2016-4?op=1

Restore the Pluto Discovery Telescope by Lowell Observatory - 
KickstarterRestore the Pluto Discovery Telescope by Lowell Observatory - Kickstarter

... 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".. ...
more infohttps://www.kickstarter.com/projects/1562362049/restore-the-pluto-discovery-telescope?ref=discovery

Brain-Friendly Giftables, part 1: Books. - Adventures in Ethics and ScienceBrain-Friendly Giftables, part 1: Books. - Adventures in Ethics and Science

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 ...
more infohttp://scienceblogs.com/ethicsandscience/2006/11/22/brain-friendly-giftables-books/

viXra.org e-Print archive, All Submission CategoriesviXra.org e-Print archive, All Submission Categories

The Failure of the Gravity/Fusion-Centric Model of Astronomical Phenomenon. Authors: Jeffrey Joseph Wolynski. Comments: 4 Pages ... Humans can see the phenomenon of life only on Earth, and humans vision does not exceed the one of lower animals. However, it ... The possibility of complementary descriptions of the physical phenomena with the help of simultaneous use of the theories of ... It is shown that Lorentz Invariance is a wave phenomenon. The relativistic mass, length contraction and time dilation all ...
more infohttp://vixra.org/all/1209

Astronomy Definition, Prefix, Suffix, Ologies and Isms, Astronomy Information and MeaningAstronomy Definition, Prefix, Suffix, Ologies and Isms, Astronomy Information and Meaning

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. - ...
more infohttp://www.faqs.org/ologies-isms/A-Ath/Astronomy.html

Photography Definition, Prefix, Suffix, Ologies and Isms, Photography Information and MeaningPhotography Definition, Prefix, Suffix, Ologies and Isms, Photography Information and Meaning

a form of photography used to record astronomical phenomena. autoradiograph radioautograph. autotype 1. a photographic process ...
more infohttp://www.faqs.org/ologies-isms/Occ-Pot/Photography.html

Transient lunar phenomenon - WikipediaTransient lunar phenomenon - Wikipedia

This description appears outlandish perhaps due to lacking public understanding of astronomical phenomena.[3][4] In 1976, Jack ... A transient lunar phenomenon (TLP) or lunar transient phenomenon (LTP) is a short-lived light, color, or change in appearance ... Explanations for the transient lunar phenomena fall in four classes: outgassing, impact events, electrostatic phenomena, and ... "Journal of the British Astronomical Association. 123 (4): 197-208.. *^ Ley, W. (1965). Ranger to the moon (p. 71). New York: ...
more infohttps://en.wikipedia.org/wiki/Transient_lunar_phenomenon

Tunisia | IYA2009 National Nodes | Astronomy 2009Tunisia | IYA2009 National Nodes | Astronomy 2009

The publication of a various brochures outlining the most important astronomical Phenomena. ... Publication of an agenda of the most important phenomena.. setting up of a web page at the website of the Tunis Science City ... Translation of the IAU publications (the International Astronomical Union) into. Arabic.. Translation of the power point ...
more infohttps://www.astronomy2009.org/organisation/nodes/national/view/TN/index.html

George Gamow facts, information, pictures | Encyclopedia.com articles about George GamowGeorge Gamow facts, information, pictures | Encyclopedia.com articles about George Gamow

Subsequently he concerned himself largely with applying nuclear physics to astronomical phenomena. Early in 1938, for example, ... International Astronomical Union, American Astronomical Society, U.S. National Academy of Sciences, Royal Danish Academy of ... He was intrigued by an unusual phenomenon that Rutherford had reported as a result of an alpha particle scattering experiment. ... the International Astronomical Union, and the Royal Danish Academy of Sciences and Letters. ...
more infohttps://www.encyclopedia.com/people/science-and-technology/physics-biographies/george-gamow

PhysicsPhysics

Application of the principles of physics to the study of astronomical phenomena. Topics include celestial mechanics, stars and ... Topics include crystal structure and properties; electronic structure of insulators, semiconductors and metals; and phenomena ... Wave motion, reflection, refraction, dispersion, diffraction, interference phenomena, Fourier spectroscopy, lasers and other ... Methods used to measure and analyze these phenomena will also be discussed. ...
more infohttps://www.southalabama.edu/bulletin/current/courses/physics/

THE DRESDEN CODEXTHE DRESDEN CODEX

... all in the Dresden Codex contained data are concerning astronomical phenomena. The Mayan astronomical observations were carried ... 5/ Analysis of the astronomical phenomena related to the single dates. PAGE F 24, 46-50, /D 24-29/. PAGE F 51 - 58, /D 30 - 37/ ... All the astronomical phenomena in the Dresden Codex are counted for the visibility from geographical area of the Mayan culture ... The results of Mayan observations and calculations of astronomical phenomena are concentrated in the Dresden Codex. It ...
more infohttp://mujweb.cz/paib/dresden_codex.htm

AD BACULUM LYRICS - Morbid End Of Cannibalistic Cosmos (2014) albumAD BACULUM LYRICS - 'Morbid End Of Cannibalistic Cosmos' (2014) album

An astronomical phenomenon was found in blackened cosmos.. Omnipotent and enthroned who came back from the dead horizons. And ... Obscure phenomenon destroying life in the cosmos. In the end of time there will be not substances and atomic fragments. Remains ...
more infohttp://www.darklyrics.com/lyrics/adbaculum/morbidendofcannibalisticcosmos.html

The Cassiopaeans Logs - 19The Cassiopaeans Logs - 19

Q: (L) Is this Black Sun an actual astronomical phenomenon? A: In essence. Q: (L) What would we know this Black Sun as? A black ... Q: (L) So there is a maverick German element, but to focus on that as being the foundational aspect of this phenomenon, is to ... Persist and express the same thoughts you did here! Help him and others to see that they are dealing with a phenomenon that is ... But, observable elements of the phenomenon of aliens have gone so far that trying to prove anything scientifically becomes moot ...
more infohttps://www.bibliotecapleyades.net/vida_alien/sess_cass/cass19.htm

Knut and Alice Wallenbergs FoundationKnut and Alice Wallenbergs Foundation

Extreme astronomical phenomena Technology & physics Lab of the future on a biochip A new type of tiny electronic biosensors has ...
more infohttp://kaw.wallenberg.org/en

CV: Eve KikasCV: Eve Kikas

Kikas, E. (1998). The impact of teaching on students definitions and explanations of astronomical phenomena. Learning and ... Kikas, E. (1997). The impact of teaching on students explanations of astronomical phenomena. Psychology of Language and ... Malleus, Elina; Kikas, Eve (2013). Students knowledge about weather phenomena before and after learning in classroom: Activity ... Kikas, E. (2004). Teachers conceptions and misconceptions concerning three natural phenomena. Journal of Research in Science ...
more infohttps://www.etis.ee/CV/Eve_Kikas/est
  • Claims of short-lived lunar phenomena go back at least 1,000 years, with some having been observed independently by multiple witnesses or reputable scientists. (wikipedia.org)
  • 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)
  • 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)
  • It's "terran" inception and unit durations reflect the human biological clock and align with astronomical cycles and epochs . (slashdot.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)
  • A transient lunar phenomenon ( TLP ) or lunar transient phenomenon ( LTP ) is a short-lived light, color, or change in appearance on the surface of the Moon . (wikipedia.org)
  • yin calendar"), is a lunisolar calendar which reckons years, months and days according to astronomical phenomena. (wikipedia.org)
  • However, a surprising new discovery from a Caltech researcher suggests that the Schrödinger Equation-the fundamental equation of quantum mechanics-is remarkably useful in describing the long-term evolution of certain astronomical structures. (caltech.edu)
  • The 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)
  • 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)
  • The in the Dresden Codex contained data were studied by many researchers that have supposed they can contain even the astronomical data. (mujweb.cz)
  • In April 2017, Swarm's data was used to confirm that Steve was a previously unrecognized atmospheric phenomenon. (wikipedia.org)