Astronomical Objects: Aggregates of matter in outer space.Extinction, Biological: The ceasing of existence of a species or taxonomic groups of organisms.Biological Evolution: The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.Congresses as Topic: Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.European Union: The collective designation of three organizations with common membership: the European Economic Community (Common Market), the European Coal and Steel Community, and the European Atomic Energy Community (Euratom). It was known as the European Community until 1994. It is primarily an economic union with the principal objectives of free movement of goods, capital, and labor. Professional services, social, medical and paramedical, are subsumed under labor. The constituent countries are Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain, Sweden, and the United Kingdom. (The World Almanac and Book of Facts 1997, p842)International Cooperation: The interaction of persons or groups of persons representing various nations in the pursuit of a common goal or interest.Th2 Cells: Subset of helper-inducer T-lymphocytes which synthesize and secrete the interleukins IL-4, IL-5, IL-6, and IL-10. These cytokines influence B-cell development and antibody production as well as augmenting humoral responses.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.Telescopes: Instruments used to observe distant objects.United States National Aeronautics and Space Administration: An independent Federal agency established in 1958. It conducts research for the solution of problems of flight within and outside the Earth's atmosphere and develops, constructs, tests, and operates aeronautical and space vehicles. (From U.S. Government Manual, 1993)HydrocarbonsSensory Aids: Devices that help people with impaired sensory responses.Astronomical Processes: The behavior and interactions of matter and energy in outer space.Eyeglasses: A pair of ophthalmic lenses in a frame or mounting which is supported by the nose and ears. The purpose is to aid or improve vision. It does not include goggles or nonprescription sun glasses for which EYE PROTECTIVE DEVICES is available.Space Flight: Travel beyond the earth's atmosphere.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)Light: That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.MedlinePlus: NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.Consumer Health Information: Information intended for potential users of medical and healthcare services. There is an emphasis on self-care and preventive approaches as well as information for community-wide dissemination and use.Social Media: Platforms that provide the ability and tools to create and publish information accessed via the INTERNET. Generally these platforms have three characteristics with content user generated, high degree of interaction between creator and viewer, and easily integrated with other sites.Neoplasms: New abnormal growth of tissue. Malignant neoplasms show a greater degree of anaplasia and have the properties of invasion and metastasis, compared to benign neoplasms.Dissent and Disputes: Differences of opinion or disagreements that may arise, for example, between health professionals and patients or their families, or against a political regime.Meteoroids: Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Jupiter: The fifth planet in order from the sun. It is one of the five outer planets of the solar system. Its sixteen natural satellites include Callisto, Europa, Ganymede, and Io.DenmarkEvolution, Planetary: Creation and development of bodies within solar systems, includes study of early planetary geology.Neptune: The eighth planet in order from the sun. It is one of the five outer planets of the solar system. Its two natural satellites are Nereid and Triton.Planets: Celestial bodies orbiting around the sun or other stars.Abbreviations as Topic: Shortened forms of written words or phrases used for brevity.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.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.Spheniscidae: The sole family in the order Sphenisciformes, comprised of 17 species of penguins in six genera. They are flightless seabirds of the Southern Hemisphere, highly adapted for marine life.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)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.Lightning Injuries: Accidental injuries caused by brief high-voltage electrical discharges during thunderstorms. Cardiopulmonary arrest, coma and other neurologic symptoms, myocardial necrosis, and dermal burns are common. Prompt treatment of the acute sequelae, including cardiopulmonary resuscitation, is indicated for survival.Tidal Waves: Water waves caused by the gravitational interactions between the EARTH; MOON; and SUN.Space-Time Clustering: A statistically significant excess of cases of a disease, occurring within a limited space-time continuum.Gravitation: Acceleration produced by the mutual attraction of two masses, and of magnitude inversely proportional to the square of the distance between the two centers of mass. It is also the force imparted by the earth, moon, or a planet to an object near its surface. (From NASA Thesaurus, 1988)Phagocytosis: The engulfing and degradation of microorganisms; other cells that are dead, dying, or pathogenic; and foreign particles by phagocytic cells (PHAGOCYTES).Gravity Sensing: Process whereby a cell, bodily structure, or organism (animal or plant) receives or detects a gravity stimulus. Gravity sensing plays an important role in the directional growth and development of an organism (GRAVITROPISM).Specific Gravity: The ratio of the density of a material to the density of some standard material, such as water or air, at a specified temperature.Gravity, Altered: A change in, or manipulation of, gravitational force. This may be a natural or artificial effect.Solar System: The group of celestial bodies, including the EARTH, orbiting around and gravitationally bound by the sun. It includes eight planets, one minor planet, and 34 natural satellites, more than 1,000 observed comets, and thousands of lesser bodies known as MINOR PLANETS (asteroids) and METEOROIDS. (From Academic American Encyclopedia, 1983)Extraterrestrial Environment: The environment outside the earth or its atmosphere. The environment may refer to a closed cabin (such as a space shuttle or space station) or to space itself, the moon, or other planets.

Human injury from atomic particles and photon exposure: fears, myths, risks, and mortality. (1/3)

Energy absorbtion from particles and photons moving at relativistic speeds has been a fundamental part of life on earth and wherever else life might exist. Heat and visible light have deeply influenced the course of human evolution, affecting habitat and nutrition. The photons of ionizing radiation that over time can possibly affect evolution, contribute to the more immediate problem of morbidity and mortality of cancer This review addresses our radiative energy absorbtion, from both natural and manmade sources, and its relationship with disease and death. Educational Public Health efforts to offset the dangers of solar ultraviolet overexposure are presented, together with data on the significant mortality of metastatic melanoma.  (+info)

Cosmic carbon chemistry: from the interstellar medium to the early Earth. (2/3)

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Astronomical reach of fundamental physics. (3/3)

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The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity. The ladder analogy arises because no single technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung. At ...
The presence of polycyclic aromatic hydrocarbons (PAHs) in the interstellar medium was suggested nearly 30 years ago after the observation of the so-called unidentified infrared bands in the emission spectra of a large variety of astronomical objects. However up to now no clear identification of a specific PAH has been done. My work focuses on simulating the dynamics of PAHs and their spectroscopic signature using classical and quantum simulations.. ...
As I do not need to tell you, an artificial black hole has never been produced. There is, I believe, recent strong evidence for the existence of black holes as astronomical objects, but since the supporting experimental evidence for GR is entirely in cases of a weak gravitational field it is entirely possible that the Schwarzschild solution does not apply to such objects. What is more, the densities of such objects are probably such that one could not ignore quantum effects. As I also do not need to tell you, we do not currently understand gravity at the quantum level. Thus our understanding of black holes from both the theoretical and experimental standpoint is extremely poor. Despite this, using semi-classical arguments Stephen Hawking was able to demonstrate that if such objects exist according to the laws of GR, then they must radiate. However, since we do not really know what is going on here, there could also be a myriad of other effects, one or other of which could making Hawking ...
Minimum orbit intersection distance (MOID) is a measure used in astronomy to assess potential close approaches and collision risks between astronomical objects.[1][2] It is defined as the distance between the closest points of the osculating orbits of two bodies. Of greatest interest is the risk of a collision with Earth. Earth MOID is often listed on comet and asteroid databases such as the JPL Small-Body Database. MOID values are also defined with respect to other bodies as well: Jupiter MOID, Venus MOID and so on. An object is classified as a potentially hazardous object (PHO) - that is, posing a possible risk to Earth - if, among other conditions, its Earth MOID is less than 0.05 AU. For more massive bodies than Earth, there is a potentially notable close approach with a larger MOID; for instance, Jupiter MOIDs less than 1 AU are considered noteworthy since Jupiter is the most massive planet.[1]. A low MOID does not mean that a collision is inevitable as the planets frequently perturb the ...
Minimum orbit intersection distance (MOID) is a measure used in astronomy to assess potential close approaches and collision risks between astronomical objects.[1][2] It is defined as the distance between the closest points of the osculating orbits of two bodies. Of greatest interest is the risk of a collision with Earth. Earth MOID is often listed on comet and asteroid databases such as the JPL Small-Body Database. MOID values are also defined with respect to other bodies as well: Jupiter MOID, Venus MOID and so on. An object is classified as a potentially hazardous object (PHO) - that is, posing a possible risk to Earth - if, among other conditions, its Earth MOID is less than 0.05 AU. For more massive bodies than Earth, there is a potentially notable close approach with a larger MOID; for instance, Jupiter MOIDs less than 1 AU are considered noteworthy since Jupiter is the most massive planet.[1]. A low MOID does not mean that a collision is inevitable as the planets frequently perturb the ...
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state. Gravitational lensing acts as a coordinate transformation that distorts the images of background objects (usually galaxies) near a foreground mass. The transformation can be split into two terms, the convergence and shear. The convergence term magnifies the background objects by ...
The Sun, like most other astronomical objects (planets, asteroids, galaxies, etc.), rotates on its axis. Unlike Earth and other solid objects, the entire Sun doesnt rotate at the same rate. Because the Sun is not solid, but is instead a giant ball of gas and plasma, different parts of the Sun spin at different rates.. We can tell how quickly the surface of the Sun is rotating by observing the motion of structures, such as sunspots, on the Suns visible surface. The regions of the Sun near its equator rotate once every 25 days. The Suns rotation rate decreases with increasing latitude, so that its rotation rate is slowest near its poles. At its poles the Sun rotates once every 36 days!. The interior of the Sun does not spin the same way as does its surface. Scientists believe that the inner regions of the Sun, including the Suns core and radiative zone, do rotate more like a solid body. The outer parts of the Sun, from the convective zone outward, rotate at different rates that vary with ...
To a methodological nominalist, labels, terms, or definitions do not describe a particular, universal essence, but instead serve as instruments to assist one in describing observable reality to others clearly through the medium of language. These labels do not assume an absolute definition, but their utility corresponds to the extent that it can describe reality in a manner consistent with our sensual perceptions and intuitive understanding of language. For instance, consider the definition of a "star"; in vernacular language, a star, in the astronomical context, is a far-away astronomical object that emits light. In its casual usage, one can correctly say that they see "stars" while gazing into a cloudless night sky, as the usage of "star" is appropriate here as "star" accurate describes what the observer sees with his/her sight. Indeed, one does not any scientific understanding on the nature of "stars" in order to fully appreciate this colloquial meaning of the term "star". It is indeed inane ...
xml version=1.0?,,rfc1807,,datestamp,2016-11-16T15:46:20.2192492,/datestamp,,bib-version,v2,/bib-version,,id,31111,/id,,entry,2016-11-16,/entry,,title,Microbial modulation of soil ecosystem processes,/title,,swanseaauthors,,author,,sid,6b2c798924ac19de63e2168d50b99425,/sid,,ORCID,0000-0002-6044-1575,/ORCID,,firstname,Geertje,/firstname,,surname,Van Keulen,/surname,,name,Geertje Van Keulen,/name,,active,true,/active,,ethesisStudent,false,/ethesisStudent,,/author,,/swanseaauthors,,date,2016-11-16,/date,,deptcode,BMS,/deptcode,,abstract,Soils are teeming with micro-organisms. Estimates vary between thousands to millions of microbial ‘species’ per gram of soil, with particle numbers including phages totalling more than astronomical objects in the universe. The application of modern sequencing technologies to biomes means we know a lot more about who is present in soils.,/abstract,,type,Journal Article,/type,,journal,Microbiology ...
The SIMBAD astronomical database provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system.
The SIMBAD astronomical database provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system.
Scientists on the Dark Energy Survey (DES), which includes UCL Astrophysics Group (P&A) researchers, announce their first three years of data including information on about 400 million astronomical objects such as distant galaxies billions of light years away as well as stars in our own galaxy. More... ...
The game is based on the traditional Game of the Goose, which was adapted to a wide range of themed boards, many produced by John Wallis, one of the leading publishers of board games in the early 19th century. Margaret Bryan (fl. 1795-1816) ran a girls school in Blackheath and was author of a number of popular works on science (ZBA4475 is her portrait), and Wallis evidently felt that her association with this game would be a testament to its accuracy, as well as highlighting its suitability for girls education. The board has 35 numbered squares depicting astronomical objects, instruments and principles as well as astronomers (Ptolemy, Tycho Brahe, Nicholas Copernicus, Isaac Newton) and moral lessons (e.g. a studious and idle boy, the county gaol and an army volunteer). One square shows the man in the moon as an example of ignorance in astronomy. By spinning a te-totum, players can travel over the board, the object being to spin numbers up to 35 and reach the final square, depicting ...
1. How is the mind related to the brain?. 2. Water and the physical basis of "holistic" organization of living processes. 3. Control of gene expression and the paradox of "supercomplexity" of living systems. 4. Beyond genetic engineering -- from Darwinian to Vernadskian evolution. 5. What is a chemical bond?. 6. Supramolecular chemistry and the "sociology of matter". 7. The puzzle of high-temperature superconductivity - What is an electric current?. 8. Magnetic isotope effects - a secret of living organisms?. 9. Low energy nuclear processes. 10. Changing the "constants" of radioactive decay.. 11. Where do raw materials come from? Self-organization and the generation of oil, gas and mineral deposits in the Earth. 12. Coupling of Earth, biosphere and solar activity, and electromagetic meteorology. 13. The coherent organization of the solar system, the Crab Nebula, galaxies and other astronomical objects -- can these objects be regarded as living organisms?. 14. Beyond quantum physics -- What is ...
Awesome! I can talk about what I think is one of the coolest inventions of all time: the analog computer.. An analog (more properly, a mechanical) computer was actually the worlds first "computer" - the Antikythera Mechanism. It was an ancient Greek device that predicted the motions of the planets and other astronomical objects. Only parts of it have been found, but we can figure out a few of its basic properties. It made its "computations" using an elaborate system of gears.. Fast forward a couple millennia. Lets go to England, and meet a man by the name of Charles Babbage. Im guessing youve heard of him. He shows up in a lot of books on alternative history, because hes hailed as one of the first computer pioneers. Babbages first "computer" was the Difference Engine, a glorified calculator that could work with polynomials. It used a lot of gears to work with polynomials and do advanced calculations. Babbage got some funding from the government, but not a lot.. Later, he worked on his more ...
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 ...
1904 Gerhard Herzberg was a pioneering physicist and physical chemist, and Nobel Laureate in chemistry. Herzbergs main work concerned atomic and molecular spectroscopy. He is well known for using these techniques that determine the structures of diatomic and polyatomic molecules, including free radicals difficult to investigate in any other way, and for the chemical analysis of astronomical objects ...
The Hubble Space Telescope is a cooperative program of the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA) to operate a long-lived space-based observatory for the benefit of the international astronomical community. To accomplish this goal and protect the spacecraft against instrument and equipment failures, NASA had always planned on regular servicing missions. Hubble has special grapple fixtures, 76 handholds, and stabilized in all three axes. HST is a 2.4-meter reflecting telescope which was deployed in low-Earth orbit (600 kilometers) by the crew of the space shuttle Discovery (STS-31) on 25 April 1990. HSTs current complement of science instruments include three cameras, two spectrographs, and fine guidance sensors (primarily used for astrometric observations). Because of HSTs location above the Earths atmosphere, these science instruments can produce high resolution images of astronomical objects. Ground-based telescopes can seldom provide ...
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Solution for describe how the 21-cm line of hydrogen is formed. Why is this line such animportant tool for understanding the interstellar medium
Impact of space flight on bacterial virulence and antibiotic susceptibility Peter William Taylor School of Pharmacy, University College London, London, UK Abstract: Manned space flight induces a reduction in immune competence among crew and is likely to cause deleterious changes to the composition of the gastrointestinal, nasal, and respiratory bacterial flora, leading to an increased risk of infection. The space flight environment may also affect the susceptibility of microorganisms within the spacecraft to antibiotics, key components of flown medical kits, and may modify the virulence characteristics of bacteria and other microorganisms that contaminate the fabric of the International Space Station and other flight platforms. This review will consider the impact of true and simulated microgravity and other characteristics of the space flight environment on bacterial cell behavior in relation to the potential for serious infections that may appear during missions to astronomical objects beyond low
The relationship between stars and the material around them -- the interstellar medium -- is complicated. Stars are born from this material -- wispy clouds of hydrogen, helium, and other elements, plus solid grains of dust. And when stars die, they expel much of their material back into the interstellar medium, enriching it with elements forged in the hearts of the stars themselves.. And between birth and death, a star can have a powerful influence on the interstellar medium around it.. An example is the star known as Alpha Camelopardalis. Its one of the brightest stars of the faint constellation Camelopardalis, the giraffe, which is high in the north on January evenings.. Alpha Cam is probably 25 to 30 times as massive as the Sun. That great heft makes its surface extremely hot, driving a strong "wind" of gas off the surface and into space, forming a big "bubble" around Alpha Cam.. The star is racing through space at more than a hundred thousand miles an hour. As it plows through the ...
Eck, C.L. van; Haverkorn, M. ; Alves, M.I.R.; Beck, R.; Bruyn, A.G. de; Enßlin, T.; Farnes, J.S.; Ferrière, K.; Heald, G.; Horellou, C.; Horneffer, A.; Iacobelli, M.; Jelić, V.; Martí-Vidal, I.; Mulcahy, D.D.; Reich, W.; Röttgering, H.J.A.; Scaife, A.M.M.; Schnitzeler, D.H.F.M.; Sobey, C; Sridhar, S.S. ...
KIDA is a database of kinetic data of interest for astrochemical (interstellar medium and planetary atmospheres) studies. In addition to the available referenced data, KIDA provides recommendations over a number of important reactions.
Boron is rare in the cosmos because its nucleus is "fragile." So, how does one get from the interstellar medium, where boron was first produced, to Earths upper continental crust where boron is concentrated in deposits containing remarkably diverse suites of boron minerals? Processes that led to the formation of continental crust also concentrated boron, which is preferentially incorporated into melts and aqueous fluids. Deposits with high boron-mineral diversity include granitic pegmatites, peralkaline intrusions, boron-enriched skarns, and evaporite deposits. Despite the loss of boron minerals from the geologic record due to their ready solubility in water and breakdown at low temperatures, the increase in boron-mineral diversity with time is real, and is accelerated during supercontinent assembly.. Read More ...
Interstellar Cycle Ultimately, stars form the interstellar medium. Stars replenish the interstellar medium at the end of their life cycle. There is a balance between the interstellar medium and stars.
Context. Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of small hydrocarbons in the interstellar medium. Information on key gas-phase progenitors of these molecules sheds light on this problem. Aims: We aim to constrain the chemical content of the Horsehead mane with a millimeter unbiased line survey at two positions, namely the photo-dissociation region (PDR) and the nearby shielded core. This project revealed a consistent set of eight unidentified lines toward the PDR position. We associate them to the l-C3H+ hydrocarbon cation, which enables us to constrain the chemistry of small hydrocarbons. We observed the lowest detectable J line in the millimeter domain along a cut toward the illuminating direction to constrain the spatial distribution of the l-C3H+ emission perpendicular to the photo-dissociation front. Methods: We simultaneously fit 1) the rotational and centrifugal distortion constants of a linear rotor; and 2) the Gaussian line shapes located at the
The reaction of ground-state carbon atoms with acetylene was studied under single-collision conditions in crossed beam experiments to investigate the chemical dynamics of forming cyclic and linear C3H isomers (c-C3H and l-C3H, respectively) in interstellar environments via an atom-neutral reaction. Combined state-of-the-art ab initio calculations and experimental identification of the carbon-hydrogen exchange channel to both isomers classify this reaction as an important alternative to ion-molecule encounters to synthesize C3H radicals in the interstellar medium. These findings strongly correlate with astronomical observations and explain a higher [c-C3H]/[l-C3H] ratio in the dark cloud TMC-1 than in the carbon star IRC+10216.. ...
A brief mission study is now presented to show the performance of a hypothetical ramjet. The fusion reaction occurring within the ramjets fusion reactor is assumed to have a mass-to-energy conversion efficiency of 0.71 percent and of the energy generated, 80 percent gets converted into useful propulsive energy while 20 percent is lost as thermal radiation. The ramjet is assumed to have a total mass of 10,000 metric tons and a ramscoop intake diameter of 7,000 kilometres. Finally, the interstellar medium is assumed to have a density of one proton per cubic centimetre. Starting from an initial velocity of 1 percent the speed of light, the time required for the ramjet to accelerate to 80 percent the speed of light is 454 days and the distance covered during this time is 0.632 light years or 5.98 trillion kilometres. Due to the effect of special relativity, the time elapsed for an observer onboard the ramjet is 369 days ...
This is a lithograph that outlines the major mission highlights of the Interstellar Boundary Explorer, or IBEX, mission, a Small Explorer Earth-orbiting spacecraft that is designed to map the distant boundary between the solar wind from our Sun and the interstellar medium, the material between ...
This is a lithograph that outlines the major mission highlights of the Interstellar Boundary Explorer, or IBEX, mission, a Small Explorer Earth-orbiting spacecraft that is designed to map the distant boundary between the solar wind from our Sun and the interstellar medium, the material between ...
Radical systems, or systems with unpaired electrons, play fundamental roles in chemistry, biology, and physics. Relevant examples include photochemical breakdown of air pollution in the lower atmosphere, carbon-carbon bond formation in synthetic and pharmaceutical chemistry, and formation of fundamental organic molecules in the interstellar medium. The work presented in this thesis focuses on the electronic structure and spectroscopy of open-shell species; the organization is as follows. Chapter 1 provides a short background and overview. Chapter 2 presents a study of the excited states of several vinylic hydrocarbon radicals, with a focus on 3p Rydberg states and the effects of increased alkyl length on excitation energies and quantum defects. Chapters 3 and 4 extend some of these conclusions to the diazomethane molecule, work which was done in close collaboration with the Reisler group at USC. Chapter 5 focuses ondiazirine, a three-membered cyclic isomer of diazomethane. The agreement between ...
If you have a question about this talk, please contact Stephen Walley.. Astronomers have long realised that reactions on the surface of dust grains play an important role in the formation of molecules in the interstellar medium (ISM), in particular those found frozen out as interstellar ices. To help understand the gas-grain interaction in the ISM , our group is undertaking a range of experimental and theoretical investigations of the adsorption, desorption and formation of interstellar ices.. This talk is part of the Surfaces, Microstructure and Fracture Group series.. ...
This is the first in a series of three papers describing a project with the Cosmic Origins Spectrograph on the Hubble Space Telescope to measure abundances of the neutral interstellar medium (ISM) in a sample of nine nearby star-forming galaxies. The goal is to assess the (in)homogeneities of the multiphase ISM in galaxies where the bulk of metals can be hidden in the neutral phase, yet the metallicity is inferred from the ionized gas in the H II regions. The sample, spanning a wide range in physical properties, is to date the best suited to investigate the metallicity behavior of the neutral gas at redshift z = 0. ISM absorption lines were detected against the far-ultraviolet spectra of the brightest star-forming region(s) within each galaxy. Here we report on the observations, data reduction, and analysis of these spectra. Column densities were measured by a multicomponent line-profile fitting technique, and neutral-gas abundances were obtained for a wide range of elements. Several caveats ...
Team member Giacomo Briani explains that the meteorite was found to contain several intrusions. These are small assemblages of minerals called xenoliths (literally foreign rock ) that have an origin different from that of the other components of the host meteorite. The Isheyevo xenoliths contain basic organic matter, which includes elements such as hydrogen and nitrogen. The usual interpretation is that the organic matter formed before the solar system, in the interstellar medium, says Briani. The Isheyevo xenoliths have unique variations in their nitrogen isotopic composition in fact, one sample showed the highest values of the 15N/14N ratio ever recorded in a meteorite.2 Solar system origin models we have at present explain this nitrogen isotopic composition as being caused by reactions between ions and molecules in the interstellar medium, explains Briani. And according to those models, the high concentrations of heavy nitrogen should be accompanied by high levels of deuterium (a hydrogen ...
Sulphur-bearing species are often used to probe the physical structure of star forming regions of the interstellar medium, but the chemistry of sulphur in these regions is still poorly understood. In dark clouds, sulphur is supposed to be depleted under a form which is still unknown despite numerous observations and chemical modeling studies that have been performed. In order to improve the modeling of sulphur chemistry, we propose an enhancement of the sulphur chemical network using experimental and theoretical literature. We test the effect of the updated network on the outputs of a three phases gas-grain chemical model for dark cloud conditions using different elemental sulphur abundances. More particularly, we focus our study on the main sulphur reservoirs as well as on the agreement between model predictions and the abundances observed in the dark cloud TMC-1 (CP). Our results show that depending on the age of the observed cloud, the reservoir of sulphur could either be atomic sulphur in the gas
In standard cosmologies, big bang nucleosynthesis is responsible for the production of hydrogen, helium and a trace abundance of lithium. The first stars - and the first galaxies - formed from this near-pristine material, and stellar nucleosynthesis accounts for the production of heavier elements (`metals, in astronomical parlance). As stars evolve and die, they return processed material to the interstellar medium, enriching the metal content and increasing the metallicity of subsequent stellar generations. Thus, within the Milky Way, the stars in the stellar halo (age 11-13 Gyrs) are 10 to 1000 times more metal-poor than the Suns neighbours in the Galactic Disk. However, a small number of dwarf galaxies are known that seem to have lain fallow, avoiding star formation and self-enrichment, for almost a Hubble time. The classic example is the dwarf galaxy I Zwicky 18, with a metallicity of [M/H]~-1.2. Investigations of the abundance in those systems tend to rest on analyses of the emission line ...
Context. It is still debated whether or not the Galactic chemical evolution of sulphur in the halo follows the flat trend with [Fe/H] that is ascribed to the result of explosive nucleosynthesis in type II SNe. It has been suggested that the disagreement between different investigations of sulphur abundances in halo stars might be owing to problems with the diagnostics used, that a new production source of sulphur might be needed in the early Universe, like hypernovae, or that the deposition of supernova ejecta into the interstellar medium is time-delayed. Aims. The aim of this study is to try to clarify this situation by measuring the sulphur abundance in a sample of halo giants using two diagnostics: the S I triplet around 1045 nm and the [S I] line at 1082 nm. The latter of the two is not believed to be sensitive to non-LTE effects. We can thereby minimize the uncertainties in the diagnostic used and estimate the usefulness of the triplet for the sulphur determination in halo K giants. We will ...
The atmospheres of low mass pre-main sequence stars are extremely valuable tools for probing the composition of the star-forming interstellar medium. This thesis investigation uses photospheric abundance analysis techniques to determine metal abundances both for individual weakly active T Tauri stars and the molecular clouds with which these stars are associated. Using the high resolution echelle spectrographs of the Palomar 1.5m and the Las Campanas Observatory 2.5m telescopes, high signal-to-noise ratio spectra have been obtained for 53 low mass pre-main sequence stars in six major northern and southern hemisphere star formation regions. Spectra were also taken of 14 main sequence stars with known effective temperatures and metallicity to serve as spectral standards. Equivalent widths of a large number of Fe I absorption lines have been measured, as well as lines of Ca I, Al I, V I, Ni I, Ti I, K I, and Li I. Temperature-sensitive line ratios of neutral iron and vanadium calibrated against the ...
ADC_Keywords: Surveys ; Photometry, H-alpha Keywords: Galaxy: halo - H II regions - ISM: atoms - ISM: structure Description: The Wisconsin H-Alpha Mapper has been designed to produce a survey of H-Alpha emission from the interstellar medium (ISM) over the entire northern sky. The instrument combines a 0.6 meter telescope and a dual-etalon 15cm Fabry-Perot spectrometer. In the primary spectral mode, an exposure captures a 200km/s spectral region with 8-12km/s velocity resolution from a one-degree beam on the sky. With a large-aperture design and modern CCD technology, WHAM can detect Galactic emission as faint as 0.05 Rayleighs in a 30 second exposure. For gas at 10000K, this observed intensity corresponds to an emission measure of about 0.1cm-6pc, more than 10 million times fainter than the Orion Nebula. File Summary ...
IT pandemic continuity plans typically assume interruptions and disasters will be either local or regional in scope, and can be over come by simplistic approaches, like cross-training for maintenance, adding intranet portals, increasing remote gateways - all things which will allow remote work accommodations and keep the systems up. The internet is in actuality, a global scale system, highly vulnerable for attacks, and with little effective infrastructure monitoring systems for protection against cyber attacks. Most of the entire global DNS system was developed during the 70s and 80s, and it suffers from performance under stress, fundamental weaknesses, and potential breaking points. When it was developed, it focused nearly solely on functionality, and gave no consideration to faults, misconfigurations, or malicious attacks. Overwhelmingly, it suffers from disparate technologies - for example, different sites may use entirely different operating systems and speeds, which in normal times work ...
The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only 10-17 million years old.[4][5]. The first carbon-containing molecule detected in the interstellar medium was the methylidyne radical (CH•) in 1937.[6] From the early 1970s it was becoming evident that interstellar dust consisted of a large component of more complex organic molecules (COMs),[7] probably polymers. Chandra Wickramasinghe proposed the existence of polymeric composition based on the molecule formaldehyde (H2CO).[8] Fred Hoyle and Chandra Wickramasinghe later proposed the identification of bicyclic aromatic compounds from an analysis of the ultraviolet extinction absorption at 2175 Å,[9] thus demonstrating the existence of polycyclic aromatic hydrocarbon molecules in space.. In 2004, scientists reported[10] detecting the spectral signatures of anthracene and pyrene in the ultraviolet light emitted by the Red Rectangle nebula (no other such ...
The uncertainties reported by the DIRBE team were dominated by systematic uncertainties in the foreground determination. This met the mission objective of searching for the CIB to the limits imposed by our astrophysical environment. Major sources of uncertainty were the stellar foreground model (1.2-3.5 µm), the interplanetary dust model (1.25-100 µm), and the interstellar medium model (100-240 µm). Because DIRBE data can yield improved measurements of the CIB as the foregrounds are better determined, it is worth summarizing how the DIRBE team analysis was done. The interplanetary dust contribution presents the most difficult problem except at the longest wavelengths, since it dominates the measured sky brightness from 1-140 µm even at high galactic and ecliptic latitude (see Figure 2, Hauser et al. 1998). The contribution from the IPD was determined by fitting a parameterized model of the spatial distribution and scattering and radiative properties of the dust cloud to the apparent annual ...
The Department of Physics offers research opportunities in astrophysics, biophysics, condensed matter physics, and the physics of materials. Astrophysical research centers on experimental radio astronomy, with particular emphasis on pulsars and the interstellar medium. Observations are carried out using major instruments of the U.S. National Observatories and generally involve computer analysis and interpretation.. Research in biophysical ultrasound is directed toward an understanding of the physical principles involved when ultrasound interacts with living systems. This often involves collaboration with the College of Medicine. Acoustical and optical tweezers permit manipulating single cells without touching them. New forms of ultrasonic transducers and biosensors are being developed in collaboration with Electrical Engineering, as part of the Materials Science Program.. Biophysical research includes studies on the development and employment of novel uses of in situ atomic force microscopy for ...
Main article: Astronomical object. *Astronomical objects *Sun (sunlight, solar radiation) *Corona. *Photosphere ... Cryoluminescence is the emission of light when an object is cooled. Crystalloluminescence[edit]. Main article: ...
I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5 ... "Publications of the Astronomical Society of Japan. 63 (5): 1117-1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. ... According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE ... Monthly Notices of the Royal Astronomical Society. 414 (1): 565-574. arXiv:1109.1109. Bibcode:2011MNRAS.414..565B. doi:10.1111/ ...
Jewitt, David C. (2002). "From Kuiper Belt Object to Cometary Nucleus: The Missing Ultrared Matter". The Astronomical Journal. ... This article is about the astronomical objects. For other uses, see Comet (disambiguation). ... In 1950, Fred Lawrence Whipple proposed that rather than being rocky objects containing some ice, comets were icy objects ... "Near Earth Object Program FAQ. NASA. Retrieved 30 July 2013.. *^ Ishii, H. A.; Bradley, J. P.; Dai, Z. R.; Chi, M.; Kearsley, A ...
Wilkins, Jamie; Dunn, Robert (2006). 300 Astronomical Objects. Firefly Books. ISBN 978-1-55407-175-3. Schlegel, Gustaaf (1967 ... Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies. "Pegasus, ... Pegasus is also noted for its more unusual galaxies and exotic objects. Einstein's Cross is a quasar that has been lensed by a ... Stephan's Quintet is another unique object located in Pegasus. It is a cluster of five galaxies at a distance of 300 million ...
2011). "A Southern Sky and Galactic Plane Survey for Bright Kuiper Belt Objects". Astronomical Journal. 142 (4): 98. arXiv: ... The object must be in orbit around the Sun.. *The object must be massive enough to be rounded by its own gravity. More ... "Plutoid chosen as name for Solar System objects like Pluto". Paris: International Astronomical Union (News Release - IAU0804). ... It is the largest known trans-Neptunian object by volume but is less massive than Eris. Like other Kuiper belt objects, Pluto ...
Lists of astronomical objects. References. *^ a b Merritt, David (2013). Dynamics and Evolution of Galactic Nuclei. Princeton, ... Brightest object in the sky in very high energy gamma rays. PG 1426+015. 7009129800000000000♠(1.298±0.385)×109[4]. ... "The Demography of Massive Dark Objects in Galaxy Centers". The Astronomical Journal. 115 (6): 2285-2305. arXiv:astro-ph/9708072 ... This object grew early in cosmic history (redshift 6.30). SDSS J081855.77+095848.0. 7010120000000000000♠(1.20±0.06)×1010[11]. ...
"NGC 5218 -- Galaxy in Pair of Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. ... SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. Retrieved 2009-01-14. " ... "Searching NED for object "ARP 104*"". NASA/IPAC Extragalactic Database (NED). Jet Propulsion Laboratory, California Institute ...
"SIMBAD Astronomical Object Database". Results for NGC 6171. Retrieved 2006-11-16. distance × sin( diameter_angle / 2 )=39.5 ly ... New General Catalogue Wikipedia Project: Astronomical Objects Shapley, Harlow; Sawyer, Helen B. (August 1927), "A ... It was not until 1947 that Helen Sawyer Hogg added it and three other objects discovered by Méchain to the list of Messier ... Globular Cluster M107 (also known as Messier Object 107 or NGC 6171) is the last globular cluster in the Messier Catalogue. It ...
doi:10.1111/j.1365-2966.2005.08921.x. "del Sct - Variable star of delta Sct type". SIMBAD Astronomical Object Database. Centre ... Colacevich, A. (August 1935). "On the variable radial velocity of δ Scuti". Publications of the Astronomical Society of the ... May 2005). "The chemical composition of δ Scuti". Monthly Notices of the Royal Astronomical Society. 359 (55): 865-873. Bibcode ... University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E. Holmberg, J.; Nordström, B.; Andersen, J ...
"Results for NGC 6139". SIMBAD Astronomical Object Database. Retrieved 2013-09-06. ...
"SIMBAD Astronomical Object Database". Results for NGC 6934. Retrieved 2007-04-21. NGC 6934 on WikiSky: DSS2, SDSS, GALEX, IRAS ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ...
"SIMBAD Astronomical Object Database". Results for NGC 6723. Retrieved 2007-04-21. Robert Burnham, Jr, Burnham's Celestial ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ... Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: ...
"SIMBAD Astronomical Object Database". Results for NGC 6397. Retrieved 2006-11-16. Marks, Michael; Kroupa, Pavel (August 2010 ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ... Monthly Notices of the Royal Astronomical Society, 406 (3): 2000-2012, arXiv:1004.2255 , Bibcode:2010MNRAS.406.2000M, doi: ... Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: ...
55 Cancri b Tau Boötis b "NLTT 5367 -- High proper-motion Star". SIMBAD Astronomical Object Database. Centre de Données ... In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their ... 9 July 2014 NameExoWorlds The Process Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 ... Bulletin of the American Astronomical Society. 39: 971. Bibcode:2007AAS...21113417M. Harrington, J; Hansen BM; Luszcz SH; ...
Eccentric Jupiter "NLTT 5367 -- High proper-motion Star". SIMBAD Astronomical Object Database. Centre de Données astronomiques ... In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their ... 9 July 2014 NameExoWorlds The Process Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 ...
"NLTT 5367 -- High proper-motion Star". SIMBAD Astronomical Object Database. Centre de Données astronomiques de Strasbourg. ... Bulletin of the American Astronomical Society. 38: 185. Bibcode:2007AAS...210.7802B. Announced American Astronomical Society ... Under the rules for naming objects in binary star systems, the two components are designated A and B. Under the same rules, the ... In July 2014 the International Astronomical Union (IAU) launched a process for giving proper names to certain exoplanets and ...
"Naming of Astronomical Objects". IAU - International Astronomical Unition. Retrieved 13 August 2017. Oliver L. White, Jeffrey M ... The International Astronomical Union (IAU) has officially approved the first 14 names on 7 September 2017, but most of the ... November 2015). "New Horizons disk-integrated approach photometry of Pluto and Charon". American Astronomical Society, DPS ...
"SIMBAD Astronomical Object Database". Results for NGC 6093. Retrieved 2006-11-16. Boyles, J.; et al. (November 2011), "Young ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ... Effects of Environment on Globular Cluster Global Mass Functions", The Astronomical Journal, 139 (2): 476-491, Bibcode:2010AJ ... Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: ...
"SIMBAD Astronomical Object Database". Results for NGC 4833. Retrieved 2006-11-17. distance × tan( diameter_angle / 2 ) = 42 ly ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ... Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: ... Astrophysical Journal Basic information and data Photographed by the Antilhue amateur astronomical observatory Photometry ...
SIMBAD Astronomical Object Database. Centre de Données astronomiques de Strasbourg. Retrieved 2007-11-28. Wilson, Ralph Elmer ( ... January 2007), "The M Dwarf GJ 436 and its Neptune-Mass Planet", The Publications of the Astronomical Society of the Pacific, ... Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical ... A Preliminary 20 Parsec Census from the NLTT Catalogue", The Astronomical Journal, 128 (1): 463-483, arXiv:astro-ph/0404061 , ...
"HD 32887 -- Variable Star". SIMBAD Astronomical Object Database. Centre de Données astronomiques de Strasbourg. Retrieved 2006- ...
Eccentric Jupiter Planetary habitability "NLTT 5367 -- High proper-motion Star". SIMBAD Astronomical Object Database. Centre de ... In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their ... Kipping, David (2009). "Transit timing effects due to an exomoon". Monthly Notices of the Royal Astronomical Society. 392: 181- ... Pourbaix, D. & Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and ...
"SIMBAD Astronomical Object Database". Results for NGC 6681. Retrieved 2006-11-17. Boyles, J.; et al. (November 2011), "Young ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ... Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: ...
"SIMBAD Astronomical Object Database". Results for NGC 6637. Retrieved 2006-11-17. distance × sin( diameter_angle / 2 ) = 42 ly ... At the time, he was searching for an object described by Nicolas-Louis de Lacaille in 1751-2 and thought he had rediscovered it ... It is a close neighbor of globular cluster M70, with 1,800 light-years separating the two objects; both of these clusters lie ... X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode: ...
HIP 11915 b - another Jupiter analog discovered in 2015 "NLTT 5367 -- High proper-motion Star". SIMBAD Astronomical Object ...
The Gohonzon is the primary object of veneration in some Nichiren schools and the only one in others, which consider it to be ... been used primarily as a ceremonial basin or ritual altar for gladiatorial sacrifices than as an astrological or astronomical ... Unlike mandalas used in Vajrayana Buddhism, it is not used as an object of meditation or for esoteric ritual. Instead, it ... Also in Jodo Shinshu Buddhism, Shinran and his descendant, Rennyo, sought a way to create easily accessible objects of ...
An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in ... International Astronomical Naming Commission List of light sources List of Solar System objects Lists of astronomical objects ... "Naming Astronomical Objects". International Astronomical Union (IAU). Archived from the original on 2 August 2010. Retrieved 4 ... that may consist of multiple bodies or even other objects with substructures. Examples for astronomical objects include ...
A hypothetical astronomical object is an astronomical object (such as a star, planet or moon) that is believed or speculated to ... and other astronomical objects. For hypothetical astronomical objects in the Solar System, see List of hypothetical Solar ... Hypothetical astronomical objects have been speculated to exist both inside and outside of the Solar System, and speculation ... For example, in the 5th century BCE, the philosopher Philolaus "defined a hypothetical astronomical object which he called the ...
List of Messier objects List of NGC objects List of NGC objects (1-999) List of NGC objects (1000-1999) List of NGC objects ( ... List of NGC objects (4000-4999) List of NGC objects (5000-5999) List of NGC objects (6000-6999) List of NGC objects (7000-7840 ... This is a list of lists, grouped by type of astronomical object. List of Solar System objects - (list of articles) List of ... List of galaxy superclusters List of voids List of most distant astronomical object record holders Astronomical objects named ...
Distances to astronomical objects may be determined through parallax measurements, use of standard references such as cepheid ... This article documents the most distant astronomical objects so far discovered, and the time periods in which they were so ... However, object must have been named or described. An object like OJ 287 is ignored even though it was detected as early as ... Objects in this list were found to be the most distant object at the time of determination of their distance. This is ...
There are probably a few thousand astronomical objects named after people. These include the names of a few thousand asteroids ... The IAU does not recognize those claims.) The list does not include astronomical objects named after mythological or fictional ... Several stars named after people List of astronomical topics List of stars named after people List of craters on Mercury List ...
Étienne Léopold Trouvelots Stunning 19th-Century Astronomical Drawings of Celestial Objects and Phenomena. The splendor of the ... The Astronomical Art of Maria Clara Eimmart: Stunning 17th-Century Drawings of Comets, Planets, and Moon Phases by a Self- ... Unlike the rest of his illustrations, which depict objects and phenomena as they appear in a single moment in time, Trouvelots ... On account of their vagueness and ill-defined contours, I have proposed for these objects the term, "Veiled Spots." ...
Cataclysmic Variables and Related Objects. Proceedings of the 158th Colloquium of the International Astronomical Union, Held at ... Cataclysmic Variables and Related Objects. Book Subtitle. Proceedings of the 158th Colloquium of the International Astronomical ... We felt therefore that the time was ripe to have an IAU meeting de- voted to an overview of CVs and related objects and the SOC ... Investigation of the Optical Variability of Relativistic Objects with High Time Resolution ...
Near Earth Object impact simulation tool for supporting the NEO mitigation decision making process - Volume 2 Issue S236 - Nick ... Proceedings of the International Astronomical Union. *ISSN: 1743-9213* *EISSN: 1743-9221* *URL: /core/journals/proceedings-of- ... Near Earth Object impact simulation tool for supporting the NEO mitigation decision making process ... Near Earth Object impact simulation tool for supporting the NEO mitigation decision making process ...
... astronomical object with long tail, celestial body with a luminous tail in English->English dictionary. Search nearly 14 ... astronomical object with long tail, celestial body with a luminous tail paper-maker novercal pressure water soiree smísit ... Results for: astronomical object with long tail, celestial body with a luminous tail. English. English. ... astronomical object with long tail, celestial body with a luminous tail. comet. ...
Influence of misalignment on output of astronomical large-core fibers of multi-object fiber spectroscopic telescopes Author(s ... Large-core fibers are wildly used in astronomical applications. For multi-object fiber spectroscopic telescopes, for example ... We chose a single-mode fiber for 650nm, which core diameter is 4 μm, to scan a large-core astronomical fiber FBP320385415, ... This experimental result is important for designing and optimizing the fiber-end adjusting devices of multi-object fiber ...
Recovery of Diffraction-Limited Object Autocorrelations from Astronomical Speckle Interferograms using the CLEAN Algorithm ... Recovery of Diffraction-Limited Object Autocorrelations from Astronomical Speckle Interferograms using the CLEAN Algorithm. ... Copyright 1990, American Astronomical Society. Received 10 April 1989; revised 26 March 1990. We thank the W. M. Keck ... Astronomical Journal, 100 (1). pp. 294-306. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20140509-091947899 ...
Data on 400 million astronomical objects released Scientists on the Dark Energy Survey (DES), which includes UCL Astrophysics ... announce their first three years of data including information on about 400 million astronomical objects such as distant ... Two UCL astrophysicists win Royal Astronomical Society awards. *Hidden in the archives: Finding the first-ever evidence of ... have been recognised in this years Royal Astronomical Society awards. The announcements were made at the Ordinary Meeting of ...
Data on 400 million astronomical objects released Scientists on the Dark Energy Survey (DES), which includes UCL Astrophysics ... announce their first three years of data including information on about 400 million astronomical objects such as distant ... Two UCL astrophysicists win Royal Astronomical Society awards. *Hidden in the archives: Finding the first-ever evidence of ...
Data on 400 million astronomical objects released Scientists on the Dark Energy Survey (DES), which includes UCL Astrophysics ... announce their first three years of data including information on about 400 million astronomical objects such as distant ...
Astronomical Telescopes: Their Object Glasses and Reflectors. By G. D. Hiscox. How to make Colorless Specimens of Plants to be ...
Astronomical Telescopes: Their Object Glasses and Reflectors. By G. D. Hiscox. Popular Errors in Meteorology. ...
Sequence of Astronomical Objects in Infrared Light. This figure shows an artists rendition comparing brown dwarfs to stars and ... These four panels show the location of the newly discovered planet-like object, dubbed "Sedna," which lies in the far... view ... This artist concept illustrates how a massive collision of objects, perhaps as large as the planet Pluto, smashed tog... view ... The artists rendition shows the newly discovered planet-like object, dubbed "Sedna," in relation to other bodies in ... view ...
Sequence of Astronomical Objects in Infrared Light. This figure shows an artists rendition comparing brown dwarfs to stars and ...
Astronomical objects, 74[edit]. Basics, 13. *Astronomical object. *Centaurus A. *Cygnus X-1 ...
THE OBJECT OF ASTRONOMICAL AND MATHEMATICAL RESEARCH. By Frank Schlesinger. Science. 22 Jan 1915. : 109-117 Full Access ...
Main article: Astronomical object. *Astronomical objects *Sun (sunlight, solar radiation) *Corona. *Photosphere ... Cryoluminescence is the emission of light when an object is cooled. Crystalloluminescence[edit]. Main article: ...
Growing Astronomical Community, Telescopes, Astrophotography, Space Objects » * General Astronomy » * Light Pollution Topics » ...
10 Hypothetical Astronomical Objects That Could Actually Exist. July 24, 2017. Space 10 Fascinating Facts About Living In Space ... Other explanations include an unidentified space object or the more fun explanation, aliens. ... scientists found that they can possibly deduce information about the interior of the object, including whether liquid water is ...
Scientists see unexplained circular astronomical objects through telescopes. The Independent. *. GE2020: Voting hours ...
Scientists see unexplained circular astronomical objects through telescopes. The Independent. *. GE2020: Voting hours ...
  • Astronomical Objects for Southern Telescopes. (wikipedia.org)
  • For multi-object fiber spectroscopic telescopes, for example the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), the aiming accuracy is important. (spie.org)
  • This experimental result is important for designing and optimizing the fiber-end adjusting devices of multi-object fiber spectroscopic telescopes. (spie.org)
  • The study of primitive bodies is also aided by ground-based telescopes and radar, which are highly useful in this field because the number of objects is so great that only a tiny fraction can be visited by spacecraft, and space missions are aided substantially by prior observation. (nap.edu)
  • Indeed, ground-based telescopes continue to discover unusual and puzzling objects in the Kuiper belt and elsewhere, and those objects might serve as the targets for future missions. (nap.edu)
  • Using Astronomical Telescopes: finding objects, tracking, choice of magnification [outdoor]. (hawaii.edu)
  • Most observers estimates the possibilities of observing a celestial object in a subjective way, depending on experience in handling their telescopes and knowledge on deep‑sky objects. (uv.es)
  • Points as the convenience of using telescopes with short focal ratios and very low magnifications, able to concentrate light of diffuse objects, and questions as the binocular giving the best performance, or the faintest star visible at a given telescope. (uv.es)
  • Telescopes also revealed the existence of objects not known to the ancients, because they are too far away and small to be spotted with the naked eye. (space.com)
  • Hartung's Astronomical Objects For Southern Telescopes. (wikipedia.org)
  • Houston's columns, and later book compilations of those columns, helped popularize the term, each month giving the reader a guided tour of a small part of the sky highlighting well known and lesser known objects for binoculars and small telescopes. (wikipedia.org)
  • Some of these objects are bright enough to find and see in binoculars and small telescopes. (wikipedia.org)
  • But the faintest objects need the light-gathering power of telescopes with large objectives, and since they are invisible to the naked eye, can be hard to find. (wikipedia.org)
  • Observing faint objects needs dark skies, so these relatively portable types of telescopes also lend themselves to the majority of amateurs who need to travel outside light polluted urban locations. (wikipedia.org)
  • Since the Messier catalog objects were discovered with relatively small 18th century telescopes it is a popular list with observers, being well within the grasp of most modern amateur telescopes. (wikipedia.org)
  • Fred Watson is the Astronomer-in-Charge and Head of Lighting and Environment at the Australian Astronomical Observatory, a division of the Commonwealth Department of Industry and Science which operates the Anglo-Australian and UK Schmidt telescopes on behalf of the astronomical community of Australia. (wikipedia.org)
  • International Astronomical Union (IAU). (wikipedia.org)
  • Star clusters: basic galactic building blocks throughout time and space, Proceedings of the International Astronomical Union, IAU Symposium. (wikipedia.org)
  • This led the International Astronomical Union (IAU) to define the term "planet" formally in 2006, during their 26th General Assembly. (wikipedia.org)
  • The International Astronomical Union (IAU) has officially approved the first 14 names on 7 September 2017, but most of the names listed on this page are still informal. (wikipedia.org)
  • The International Astronomical Union (IAU) is the officially recognized authority in astronomy for assigning designations to celestial bodies such as stars, planets, and minor planets, including any surface features on them. (wikipedia.org)
  • In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. (wikipedia.org)
  • Designations of stars (and other celestial bodies) and their naming is currently primarily mediated in the scientific community by the International Astronomical Union (IAU), a de facto authority. (wikipedia.org)
  • However, Brown suspects the Spanish team of fraud, by using Caltech observations to make their discovery, while the Ortiz team accuses the American team of political interference with the International Astronomical Union (IAU). (wikipedia.org)
  • On September 17, 2008, it was recognized as a dwarf planet by the International Astronomical Union (IAU) and named after Haumea, the Hawaiian goddess of childbirth. (wikipedia.org)
  • University of Toronto: International Astronomical Union. (wikipedia.org)
  • In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. (wikipedia.org)
  • The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, University of Toronto: International Astronomical Union, 30: 57, Bibcode:1967IAUS. (wikipedia.org)
  • Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role While parts of the constellation technically rise above the horizon to observers between 50°N and 65°N, stars within a few degrees of the horizon are to all intents and purposes unobservable. (wikipedia.org)
  • One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. (wikipedia.org)
  • Since the time of Ptolemy, Andromeda has remained a constellation and is officially recognized by the International Astronomical Union, although like all modern constellations, it is now defined as a specific region of the sky that includes both Ptolemy's pattern and the surrounding stars. (wikipedia.org)
  • The naming of astronomical objects and surface features in those objects is handled by two bodies of the International Astronomical Union (IAU). (wikipedia.org)
  • In modern astronomy, the designation of stars is done by the International Astronomical Union (IAU). (wikipedia.org)
  • These names are not recognized by the International Astronomical Union (IAU). (wikipedia.org)
  • X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830-1837, arXiv:1008.2755 , Bibcode:2010AJ. (wikipedia.org)
  • Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society, 404 (3): 1203-1214, arXiv:1001.4289 , Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x. (wikipedia.org)
  • Fraquelli, Dorothy (February 1974), "MK Spectral Types for Some Bright F Stars", Publications of the Astronomical Society of the Pacific, 86 (509): 7, Bibcode:1974PASP. (wikipedia.org)
  • Kroupa, Pavel (August 2010), "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, 406 (3): 2000-2012, arXiv:1004.2255 , Bibcode:2010MNRAS.406.2000M, doi:10.1111/j.1365-2966.2010.16813.x. (wikipedia.org)
  • Effects of Environment on Globular Cluster Global Mass Functions", The Astronomical Journal, 139 (2): 476-491, Bibcode:2010AJ. (wikipedia.org)
  • July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161-170, arXiv:astro-ph/0603770 , Bibcode:2006AJ. (wikipedia.org)
  • Graham, Alister W. (November 2008), "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values", Publications of the Astronomical Society of Australia, 25 (4): 167-175, arXiv:0807.2549 , Bibcode:2008PASA. (wikipedia.org)
  • February 2010), "A Wide-Field Photometric Survey for Extratidal Tails Around Five Metal-Poor Globular Clusters in the Galactic Halo", The Astronomical Journal, 139 (2): 606−625, Bibcode:2010AJ. (wikipedia.org)
  • February 2012), "The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53)", Monthly Notices of the Royal Astronomical Society, 420 (2): 1333−1346, arXiv:1111.0216 , Bibcode:2012MNRAS.420.1333A, doi:10.1111/j.1365-2966.2011.20119.x. (wikipedia.org)
  • August 2012), "Investigation of variable star candidates in the globular cluster NGC 5024 (M53)", Monthly Notices of the Royal Astronomical Society, 424 (4): 2722−2732, arXiv:1205.5112 , Bibcode:2012MNRAS.424.2722B, doi:10.1111/j.1365-2966.2012.21360.x. (wikipedia.org)
  • While discovering icy objects that far away was not unexpected - the supposed Oort Cloud , the birthplace of comets, should have trillions of these things - it was the size that made other astronomers pay attention. (space.com)
  • Astronomers harvest information across the electromagnetic spectrum, using spectra to measure the composition of distant objects and diagnose extreme physical conditions. (coursera.org)
  • Astronomers need to be able to assign systematic designations to unambiguously identify all of these objects, and at the same time give names to the most interesting objects and, where relevant, features of those objects. (wikipedia.org)
  • The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. (wikipedia.org)
  • Astronomers have surmised that the speed of the gas clouds orbiting the core (approximately 7005400000000000000♠400 km/s) indicates the presence of an object with a mass 300 million times that of the sun, which is most likely a black hole. (wikipedia.org)
  • Innumerable astronomical objects were discovered by astronomers studying the NGS-POSS photographs. (wikipedia.org)
  • Some astronomers speculated that they had detected a star, but others argued that the object must be a moon, citing not only the two different directions from which the radiation had emanated, but also the belief that such high-energy radiation could not penetrate very far through the interstellar medium. (wikipedia.org)
  • Studies of primitive bodies encompass asteroids, comets, Kuiper belt objects (KBOs), the moons of Mars, and samples-meteorites and interplanetary dust particles-derived from them. (nap.edu)
  • Haumea's elongated shape together with its rapid rotation, high density, and high albedo (from a surface of crystalline water ice), are thought to be the consequences of a giant collision, which left Haumea the largest member of a collisional family that includes several large trans-Neptunian objects (TNOs) and Haumea's two known moons, Hiʻiaka and Namaka. (wikipedia.org)
  • Hypothetical astronomical object Claimed moons of Earth Mercury's Moon. (wikipedia.org)
  • A planetary system and various minor objects such as asteroids, comets and debris, can form in a hierarchical process of accretion from the protoplanetary disks that surrounds newly formed stars. (wikipedia.org)
  • Herschel identified 79 objects as planetary nebulae, but only 20 of them truly were, while 13 others that he had classified as other objects turned out to be these gaseous shells. (space.com)
  • The IAU also created a newer classification, "dwarf planet," which is an object that meets planetary criteria except that it has not cleared debris from its orbital neighborhood. (space.com)
  • The Blue Snowball Nebula, a planetary nebula, is visible in a telescope as a blue circular object. (wikipedia.org)
  • The Dumbbell Nebula (M27), is a large, bright planetary nebula which was discovered by the French astronomer Charles Messier in 1764 as the very first object of its kind. (wikipedia.org)
  • Abell Catalog of Planetary Nebulae), which was used for decades for purposes of cataloging and categorizing celestial objects, especially in studies of galaxy morphology. (wikipedia.org)
  • Hypothetical astronomical objects have been speculated to exist both inside and outside of the Solar System, and speculation has included different kinds of stars, planets, and other astronomical objects. (wikipedia.org)
  • They tested the astronomical knowledge of Norwegian middle school pupils (grades 8-10) through questionnaires asking them to rank the sizes of the Galaxy, the Solar System, stars, planets, and the Universe, and requesting simple explanations of each. (aps.org)
  • At any given time only some planets and other objects are visible. (hawaii.edu)
  • This is a list of astronomical objects formerly widely considered planets. (wikipedia.org)
  • In standard astronomical notation, an apparent magnitude in the V ("visual") filter band would be denoted either as m V or often simply as V , as in " m V = 15" or " V = 15" to describe a 15th-magnitude object. (wikipedia.org)
  • The coma may be up to 15 times the Earth's diameter, while the tail may stretch one astronomical unit . (wikipedia.org)
  • These distortions can occur when light from an astronomical object passes through the Earth's atmosphere, for example. (nature.com)
  • These proportionalities may be expressed by the formula: g = m r 2 {\displaystyle g={\frac {m}{r^{2}}}} where g is the surface gravity of an object, expressed as a multiple of the Earth's, m is its mass, expressed as a multiple of the Earth's mass (5.976·1024 kg) and r its radius, expressed as a multiple of the Earth's (mean) radius (6,371 km). (wikipedia.org)
  • It was originally classified as a planet, but it was later realized that Ceres was the first of a class of objects eventually called asteroids. (space.com)
  • After the solid hydrogen that kept WISE's detectors cool was exhausted, WISE was still able to use the 3.4- and 4.6-micron detectors to survey the main asteroid belt and search for near-Earth objects (NEOs), asteroids whose orbits cross that of Earth. (britannica.com)
  • The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. (wikipedia.org)
  • Discovery-class missions are ideally suited to research on primitive bodies, although larger missions also play a vital role, particularly for objects in the outer solar system that cannot be reached without radioisotope power systems. (nap.edu)
  • He chose seven colors out of a belief, derived from the ancient Greek sophists , of there being a connection between the colors, the musical notes, the known objects in the solar system , and the days of the week. (wikipedia.org)
  • Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System . (wikipedia.org)
  • That changed in the 2000s, when Mike Brown - a young astronomer at the California Institute of Technology - was in search of a defining research project and decided upon searches for objects in the outer solar system. (space.com)
  • "The only astronomical objects specifically excluded from SIMBAD are the Sun and Solar System bodies. (wikiversity.org)
  • Deep-sky object (abbreviated as DSO) is a term designating any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc. (wikipedia.org)
  • An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe. (wikipedia.org)
  • Terrestrial objects tend toward a different part of the universe according to their composition of the four elements. (absoluteastronomy.com)
  • Objects didn't really exert gravitational forces on one another, which in turn caused accelerations/changes in momentum, but rather the entire Universe existed in a framework known as spacetime, and the presence of matter-and-energy curved the fabric of that spacetime, causing objects to move as they do. (scienceblogs.com)
  • Certainly, even if you knew it was an astronomical object, you'd be excused if you missed the idea that it's actually one of the most catastrophic events in the Universe: a supernova. (syfy.com)
  • The Universe, Yours to Discover: Celebrating Highlights from the First Five Years of Astronomical Imagery Presented at Astrofest, 2009 - 2014. (wikipedia.org)
  • 300 Astronomical Objects: A Visual Reference to the Universe. (wikipedia.org)
  • Its jets, caused by the supermassive black hole at its center, extend several million light-years in both directions, making them some of the largest objects in the universe. (wikipedia.org)
  • Such objects represent some of the most extreme and energetic physical processes in the universe. (wikipedia.org)
  • We will help you get up to date on the most recent astronomical discoveries while also providing support at an introductory level for those who have no background in science. (coursera.org)
  • This has been assisted by advances in cataloging in the late 1990s that have increased substantially the sample sizes involved in astronomical measurements. (wikipedia.org)
  • calibration measurements of Saturn are performed at the start of the mission, followed by a programme including galactic and extra-galactic objects. (dlr.de)
  • The estimate could also be effected by gravitational lensing, although it is too far away from the nearest visible object that could produce that effect: a foreground spiral galaxy located 7″.3 distant. (wikipedia.org)
  • The astronomical issues were soon resolved in favor of Curtis' position when Edwin Hubble discovered Cepheid variable stars in the Andromeda Galaxy. (wikipedia.org)
  • Auxiliary units simulate a rotating galaxy, and provide pictures of astronomical objects. (wikipedia.org)
  • There will be an optional daytime meeting to view the Sun, and one or more nighttime trips to a dark site to view the Milky Way and faint objects. (hawaii.edu)
  • By applying some basic physical principles to a variety of situations, students will learn how to relate everyday physics to the astronomical world. (google.com)
  • In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. (wikipedia.org)
  • These objects provide unique information on the solar system's origin and early history and help researchers to interpret observations of debris disks around other stars. (nap.edu)
  • reflected from material and material objects, like stars. (coursera.org)
  • Objects at this stage are known as Class I protostars, which are also called young T Tauri stars , evolved protostars, or young stellar objects. (wikipedia.org)
  • The amount of shift is quite small, measuring 1 arcsecond for an object at the 1 parsec (3.26 light-years) distance of the nearest stars, and thereafter decreasing in angular amount as the distance increases. (wikipedia.org)
  • The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888 as a new version of John Herschel's General Catalogue of Nebulae and Clusters of Stars. (wikipedia.org)
  • The first major update to the NGC is the Index Catalogue of Nebulae and Clusters of Stars (abbreviated as IC), published in two parts by Dreyer in 1895 (IC I, containing 1,520 objects) and 1908 (IC II, containing 3,866 objects). (wikipedia.org)
  • The spectrum of this object indicates that most of its energy is being emitted by stars with three solar masses or less. (wikipedia.org)
  • Metallicity within stars and other astronomical objects is an approximate estimation of their chemical abundances that change over time by the mechanisms of stellar evolution, and therefore provide an indication of their age. (wikipedia.org)
  • X + Y + Z = 1.00 {\displaystyle X+Y+Z=1.00} In most stars, nebulae and other astronomical sources, hydrogen and helium are the two dominant elements. (wikipedia.org)
  • Several objects formerly considered exoplanets have been found to actually be stars or brown dwarfs. (wikipedia.org)
  • One way is to compare the physical size of an object to its angular size, but a physical size must be assumed to do this. (wikipedia.org)
  • As the infall of material from the disk continues, the envelope eventually becomes thin and transparent and the young stellar object (YSO) becomes observable, initially in far-infrared light and later in the visible. (wikipedia.org)
  • Classifying non-stellar astronomical objects began soon after the invention of the telescope. (wikipedia.org)
  • A comet may be identified as both body and object: It is a body when referring to the frozen nucleus of ice and dust, and an object when describing the entire comet with its diffuse coma and tail. (wikipedia.org)
  • The table below lists the general categories of bodies and objects by their location or structure. (wikipedia.org)
  • In quick succession, Brown and his team discovered several large "trans-Neptunian objects," or icy bodies beyond Neptune's orbit. (space.com)
  • Because these bodies do not travel in a perfect circle, they are not always the same distance from the center of their orbit or the object that they orbit. (reference.com)
  • It was the first and the largest Kuiper belt object to be discovered. (wikipedia.org)
  • Pluto was discovered by Clyde Tombaugh in 1930 and declared to be the ninth planet from the Sun. After 1992, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt. (wikipedia.org)
  • Like other Kuiper belt objects, Pluto is primarily made of ice and rock and is relatively small-one-sixth the mass of the Moon and one-third its volume. (wikipedia.org)
  • The same day as the MPC publication, Brown's group announced the discovery of another Kuiper belt object, Eris, more distant and brighter (and apparently larger) than Pluto, as the tenth planet. (wikipedia.org)
  • When electronic imaging came about, Trans-Neptunian Objects of the Kuiper Belt were found, and then Eris, widely hailed as the "new planet", was discovered, which prompted the 2006 round of recategorization of what is a planet. (wikipedia.org)
  • Discovery-class missions have already produced and will continue to produce important science on these objects. (nap.edu)
  • The objects now called "brown dwarfs" were theorized to exist in the 1960s by Shiv S. Kumar and were originally called black dwarfs , a classification for dark substellar objects floating freely in space that were not massive enough to sustain hydrogen fusion. (wikipedia.org)
  • The first self-consistent calculation of the hydrogen-burning minimum mass confirmed a value between 0.08 and 0.07 solar masses for population I objects. (wikipedia.org)
  • Monthly Notices of the Royal Astronomical Society. (springer.com)
  • In 1886, he suggested building a second supplement to the General Catalogue, but the Royal Astronomical Society asked Dreyer to compile a new version instead. (wikipedia.org)
  • This led to the publication of the New General Catalogue in the Memoirs of the Royal Astronomical Society in 1888. (wikipedia.org)
  • She was the first woman to be awarded a Gold Medal of the Royal Astronomical Society (1828), and to be named an Honorary Member of the Royal Astronomical Society (1835, with Mary Somerville). (wikipedia.org)
  • Since then, an exoplanet about eight times the mass of Jupiter has been discovered orbiting approximately 8 astronomical units (AU) away from the star-a similar distance as that between our Sun and Saturn. (wikipedia.org)
  • The smaller object is Gliese 229B, about 20 to 50 times the mass of Jupiter, orbiting the star Gliese 229 . (wikipedia.org)
  • Which of the following are the differences between a star and an astronomical yellow source? (wikiversity.org)
  • Some older references use the confusing and now discontinued designation of A×B. Because the distance between the Sun and Alpha Centauri AB does not differ significantly from either star, gravitationally this binary system is considered as if it were one object. (wikipedia.org)
  • Under the rules for naming objects in binary star systems, the two components are designated A and B. Under the same rules, the first planet discovered orbiting υ Andromedae A should be designated υ Andromedae Ab. (wikipedia.org)
  • The exoplanet was found by using the radial velocity method, where periodic Doppler shifts of spectral lines of the host star suggest an orbiting object. (wikipedia.org)
  • In 1983, based on radiation in the infrared portion of the electromagnetic spectrum, the InfraRed Astronomical Satellite was used to identify dust orbiting this star. (wikipedia.org)
  • A large object, such as a planet or star, will usually be approximately round, approaching hydrostatic equilibrium (where all points on the surface have the same amount of gravitational potential energy). (wikipedia.org)
  • For most celestial objects, the result is that the planet or star in question can be treated as a near-perfect sphere when the rotation rate is low. (wikipedia.org)
  • For the astronomical object, see Variable star. (wikipedia.org)
  • From time to time, additional viewing sessions may be scheduled to take advantage of unique astronomical events such as eclipses, meteor showers, occultations, etc. (hawaii.edu)