n
(astronomy) That which accretes, but especially any massive star etc.
n
(astronomy) A compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum.
n
(astronomy) A galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy.
n
(astronomy) One of the brightest stars in the sky, now recognised to be a binary star in the constellation Taurus (alpha (α) Tauri); an orange giant, 68 light years from Earth.
n
(astronomy) A spiral galaxy in the Local Group and closest to the Milky Way, visible to the naked eye in the constellation of Andromeda, the brightest of the Messier objects and often referred to by its designation M31.
n
(astronomy) A small arc of a galaxy
n
(astronomy) Any of a class of giant stars whose spectra show the presence of s-process elements (such as barium)
n
(astronomy) A spiral galaxy with a central bar-shaped structure composed of stars.
n
(astronomy) a hypothetical class of star developing from a red dwarf.
n
(astronomy) a very hot and very luminous star that emits visible light in the blue portion of the spectrum
n
(astronomy) a type of helium-burning blue giant star that is hotter than the average star in this stage of their life, due to having a more massive helium core
n
(astronomy) An unusually hot and blue star in globular clusters.
n
(astronomy) a very large, hot and luminous star; a large blue giant
n
A dark cloud of dense cosmic dust and gas in which star formation sometimes takes place.
n
(astronomy) A star that straddles the boundary between being a giant star and a supergiant.
n
(astronomy) A starlike object that contracts to about the volume of the planet Jupiter after its formation phase; its mass may range from several times that of Jupiter, such that it fuses deuterium, up to just below the threshold of sustained hydrogen fusion.
n
(astronomy) any of a class of red giant stars having a high proportion of carbon because of helium burning
n
(astronomy) a type of giant elliptical galaxy
n
(countable, astronomy) Initialism of circumgalactic medium. [(astronomy, plasma physics) The gas and plasma in the region surrounding a galaxy, beyond the galactic disc or ovoid, or interstellar medium (ISM), but within the galaxy's virial radius.]
n
(astronomy, plasma physics) The gas and plasma in the region surrounding a galaxy, beyond the galactic disc or ovoid, or interstellar medium (ISM), but within the galaxy's virial radius.
adj
(astronomy) Surrounding a pulsar
n
(astronomy) A group of galaxies or stars that appear near each other.
n
(astronomy) an RR Lyrae variable; a type of variable star commonly (but not exclusively) found in globular clusters
adj
(astronomy) centred on a galactic cluster
n
(astronomy, meteorology, geology) The portion of the flight of a meteor, after its incandescent fireball phase, when the space rock has cooled down and slowed down, so that it is no longer glowing, but still in flight, and yet to crash onto the ground.
n
(astronomy) the intergalactic void that exists between galaxies
n
(astronomy) Two quasars that form a system, such that they gravitationally interact, or are part of the same cluster of galaxies; a binary quasar.
n
(astronomy) Abbreviation of dwarf spheroidal galaxy. [(astronomy) A faint galaxy, devoid of gas, having a higher than normal proportion of dark matter; especially those that orbit the Milky Way and Andromeda]
n
(astronomy) Any galaxy, considerably smaller than the Milky Way, that has only several billions of stars.
n
(astronomy) A faint galaxy, devoid of gas, having a higher than normal proportion of dark matter; especially those that orbit the Milky Way and Andromeda
n
(astronomy) A star that is located in the main sequence in the Hertzsprung-Russell diagram; fuses hydrogen into helium in its core.
n
(astronomy) An extended pillar-like mass of interstellar gas and dust found near a massive star.
n
(astronomy) An elliptical galaxy.
n
A galaxy having a smooth, featureless light-profile. It is one of the three main classes of galaxies originally described by Edwin Hubble in his 1936 work “The Realm of the Nebulae”.
n
(astronomy) A large gas cloud (nebula) larger than galaxies, found in intergalactic space, which radiates with an emission spectrum containing 2.47 THz lines (Lyman-alpha lines).
n
(astronomy) A hypothetical type of star composed of exotic matter.
n
(astronomy) Abbreviation of fast blue optical transient. [(astronomy) a very short duration bright flash in the visible spectrum; thought to be caused by a type of supernova]
n
(astronomy) a spiral galaxy with discontinuous spiral arms
n
(astronomy) A free-floating evaporating gaseous globule; a relatively concentrated mass of gas in a star-forming region
n
(astronomy) A stellar population within the Milky Way Galaxy that forms a sausage-shaped plot in velocity-space, which is thought to originate from a galaxy merger 10 billion years ago, with the Gaia-Enceladus galaxy, composing mostly Milky Way halo stars.
n
(astronomy, galactic archaeology) A former galaxy, which merged into the Milky Way Galaxy around 10 billion years ago, the remnants of which now form the Gaia Sausage population within the Milky Way Galaxy.
n
The process by which a large galaxy, through tidal gravitational interactions with a companion, merges with that companion, resulting in a larger, often irregular galaxy.
n
(astronomy) An aggregation of individual stars, dust, and gas (and possibly dark matter) that surrounds a galaxy
n
(fashion, design) Any print or pattern reminiscent of a galaxy, generally consisting of blending, semiopaque patches of vibrant color on a dark background.
n
(astronomy, galaxies) A cluster of hundreds of galaxies.
n
(cosmology) A massive, thread-like formation of gravitationally bound galaxies forming the boundaries between large voids in the universe.
n
(astronomy) A group of galaxies that hold together gravitationally.
n
(physics, astronomy) A hydrodynamic model of galaxy formation.
n
(astronomy) A star that is considerably more luminous than a main sequence star of the same temperature (e.g. red giant, blue giant).
n
(astronomy) A star that has stopped fusing hydrogen in its core and as a result has grown much larger and brighter.
n
(astronomy) a densely-packed spherical star cluster containing thousands to millions of stars
n
(astronomy) A tiny region of space where a planet's gravity would alter the orbit of a passing asteroid such that the asteroid would collide with that planet on a given future orbital pass.
n
(astronomy, obsolete) The Andromeda Galaxy, a term that was used before it was known to be a spiral galaxy.
n
(astronomy) Either of two identified areas containing hundreds of galaxies.
n
(astronomy) A type of galaxy, found in the local universe, that are active, undergoing high rates of star formation, which provides a green tinge, and are compact, visually appearing akin to peas. These active galaxies have strong oxygen emission lines and no active galactic nucleus (“AGN”), similar to small galaxies in the distant early universe, but unlike those in the nearby contemporary universe.
n
(astronomy) A small number (up to about fifty) of galaxies that are near each other.
n
(astronomy) A cloud of gas and other matter surrounding and captured by the gravitational field of a large diffuse astronomical object, such as a galaxy or cluster of galaxies.
n
(astronomy) The sudden beginning of the burning of helium in the core of stars of intermediate mass or on the surface of an accreting white dwarf.
n
(astronomy) A star which has lost most or all of its hydrogen, leaving just a core of helium.
n
(astronomy) A star in which the strength of the helium absorption lines vary periodically; at times appearing to be a helium star.
n
(astronomy) a small, bright knot of nebular emission in a dark, interstellar cloud of gas and dust; thought to be mass ejected from a young star
n
(astronomy) A collection of galaxies designated as published by Paul Hickson in 1982.
n
(astronomy) The warm, dense inner region of the envelope of young stellar objects where complex organic molecules are located.
n
A very large cluster (typically of galaxies or proteins)
n
(astronomy, rare) A system that consists of an enormous galaxy accompanied by multiple, smaller satellite galaxies, often elliptical, such as the Milky Way and Andromeda galaxy.
n
(astronomy) A star that is extremely massive and even more luminous than a supergiant.
n
(astronomy) irregular galaxy with no coherent structure
adj
(astronomy) Between arms of a spiral galaxy.
n
A diffuse plasma that exists between galaxies.
n
(astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays.
n
(astronomy) Abbreviation of irregular galaxy. [(astronomy) A galaxy which is has no spirals and is not elliptical.]
n
(astronomy) A galaxy which is has no spirals and is not elliptical.
n
(informal, astronomy, archaic) A galaxy
n
(galaxies) a type of galaxy created by ram pressure stripping the interstellar gas from a galaxy by the high temperature higher pressure intracluster medium, forming long tendrils of concentrated gas trailing behind the galaxy, which form nebulae and new stars, giving the appearance of celestial jellyfish
n
(astronomy) The effect of differential rotation speeds in the rings of Saturn
n
(astronomy) A supercluster of galaxies that includes the Milky Way
n
(astronomy) A particular dwarf irregular galaxy, the largest satellite of Milky Way.
n
(astronomy) An implied cosmological scale alignment of matter. An assemblage of quasars that appear to form a structure, having them closely grouped in the sky in terms of redshift and lateral placement, implying an outline of a dimmer more massive structure in which the quasars are embedded.
n
(astronomy) a star of spectral type K or M
n
(astronomy) A galaxy that, like spiral galaxies, has a flat disk, but unlike them has lost most of its interstellar matter and therefore has no spirals; considered a transitional form between spirals and elliptical galaxies.
n
(stars) A neutron star in Milky Way Galaxy, Virgo constellation; The first star, a pulsar, at which exoplanets were discovered.
n
(astronomy) A region of interstellar space containing about one tenth the average density of matter of our galaxy.
n
(astronomy) A relatively dense region of interstellar space (containing our Solar System) that formed where the Local Bubble met another bubble, the Loop I Bubble
n
(astronomy) The small cluster of galaxies that contains the Milky Way Galaxy; includes Andromeda, Triangulum, the Large Magellanic Cloud, Small Magellanic Cloud and others.
n
(astronomy) The supercluster that includes the Milky Way galaxy.
n
(astronomy) Local Supercluster
n
(astronomy) Either of two irregular galaxies that are close companions of our Milky Way galaxy.
n
(astronomy) A major grouping of stars represented on a Hertzsprung-Russell diagram by a nearly uniform band of increasing luminosity with increasing surface temperature.
n
(astronomy) Any of a class of galaxies that have nuclei with excessive amounts of ultraviolet emissions.
n
(astronomy) A group of superclusters
n
(astronomy) Any celestial object exhibiting enormous maser activity
n
The central galaxy of the Virgo Cluster of galaxies, which in turn is the central cluster of the Virgo Supercluster (Local Supercluster) of galaxies, which in turn is the local lobe of the Laniakea Supercluster. (The Earth, its Solar System, and our Milky Way Galaxy are contained within the Local Supercluster.)
n
The central supermassive black hole of galaxy Messier 87, the first directly imaged supermassive blackhole
n
(astronomy) Any very large-scale organized collection of galaxies.
n
(astronomy) The galaxy that would result from the predicted Andromeda–Milky Way collision.
n
(astronomy) The Milky Way Galaxy, the galaxy in which Earth is located; extension of the night sky phenomenon.
n
(astronomy) The galaxy in which Earth and the rest of the Solar System is located.
adj
Referring to the Milky-Way Galaxy or its components.
n
Alternative form of Milky Way Galaxy [(astronomy) The galaxy in which Earth and the rest of the Solar System is located.]
n
(astronomy) A small region of very low density within a galaxy.
n
(astronomy) A large and relatively dense cloud of cold gas and dust in interstellar space from which new stars are formed
n
a dense core found in molecular clouds which lead to the formation of stars
n
massive star forming region
n
(astronomy) A catalogue of deep sky objects compiled in the 1880s by J. L. E. Dreyer using observations mostly from William Herschel. It contains nearly 8,000 objects, known as the NGC objects. Objects in the catalogue are numbered, and the letters NGC are prepended to these numbers, as in NGC 224 (the Andromeda Galaxy) or NGC 6205 (the globular cluster in Hercules).
n
(astronomy) The Solar System's Oort cloud, extending from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets around the Solar System.
n
(astronomy) Ellipsis of green pea galaxy. [(astronomy) A type of galaxy, found in the local universe, that are active, undergoing high rates of star formation, which provides a green tinge, and are compact, visually appearing akin to peas. These active galaxies have strong oxygen emission lines and no active galactic nucleus (“AGN”), similar to small galaxies in the distant early universe, but unlike those in the nearby contemporary universe.]
n
(astronomy) The remnant hot luminous core of the stellar progenitor of the planetary nebula, which ionizes the surrounding planetary nebula.
n
(astronomy) A nebula powered by the pulsar wind of a pulsar.
n
(astrophysics, usually attributively) A hypothetical population or group of stars which may have existed in the early history of the Universe, characterized by being extremely massive and hot and having an extremely low metallicity.
n
(astronomy) A group of galaxies that are beginning to form a cluster
n
A cloud of gas which is starting to form a galaxy.
n
(astronomy) A number of galaxies that become a galaxy group over time
n
(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
n
(astronomy) Any pulsating astronomical object
n
(astronomy) An extragalactic object, starlike in appearance, that is among the most luminous and (putatively) the most distant objects in the universe.
n
(astronomy) A group of red giants that cluster together on a Hertzsprung-Russell diagram, usually in reference to those around 5000 Kelvin and absolute magnitude +0.5.
n
(astronomy) A small, relatively cool star of the main sequence; most stars in the Milky Way are red dwarfs.
n
(astronomy) A large red coloured star with a lower surface temperature than many stars, being at the final stage of moderately massive main-sequence stars.
n
Ellipsis of red nugget galaxy. [(galaxies) A type of passive, massive and compact elliptical galaxy, that has been little changed over many billions of years, having little internal activity, little to no interaction with other galaxies, little to no new star formation in billions of years. The galaxies typically are many times more massive, and many times smaller, than our Milky Way Galaxy. The redness grows as stars age, which as a population, become redder with time.]
n
(astronomy) A star that has a relatively high velocity relative to its surroundings; typically the result of a supernova in a binary star system
n
(astronomy) supercluster (of galaxies), galaxy superclsuter
n
(astronomy) The apparent radius of a star etc, when viewed from Earth.
n
(astronomy) A rapidly-rotating star that has an equatorial circumstellar disc of gas
n
(astronautics, space science) A hypothetical megastructure consisting of a gargantuan statite used to redirect the radiation pressure of a star, generating a net thrust which slowly accelerates the whole system in the direction of the statite.
n
(astronomy) irregular galaxy with spiral characteristics
n
(astronomy, galaxies) Abbreviation of Southern MAssive Cluster Survey. A survey and catalogue of galaxy clusters (“clusters of galaxies”)
n
(astronomy) A particular dwarf irregular galaxy, a satellite of Milky Way.
n
(astronomy) supernova remnant
n
(astronomy) A classification of stars depending on their spectra and luminosity; usually one of O, B, A, F, G, K, M.
n
(astronomy) A section of a spiral galaxy that coils out from the centre.
n
(astronomy) A galaxy having a number of arms of younger stars that spiral out from the centre containing older ones
n
(astronomy) a spiral-shaped nebula
n
(astronomy) A period in time during which a region of space experiences an unusually high rate of star formation.
n
(astronomy) A galaxy that is undergoing a high rate of star formation
n
the flat part of a spiral galaxy around the central bulge
n
(astronomy) An area of outer space within a dense nebula in which gas and dust are contracting, resulting in the formation of new stars.
n
(astronomy) The equivalent of solar wind associated with a star not restricted to being the Sun.
n
A planetary mass object, less massive than a brown dwarf star, and not in orbit around a star.
n
(astronomy) A star that has left the main sequence but has not yet become a true giant star.
adj
(astronomy, of an object) Having a mass less than the minimum necessary mass for hydrogen fusion
n
(astronomy) Alternative form of supercluster [(astronomy) An extended group of clusters of galaxies]
n
(astronomy) Ellipsis of superluminous spiral galaxy. [(astronomy) a type of supergiant spiral galaxy of the local universe that is much larger than most giant spiral galaxies, and whose stellar creation rate is much higher than typical spiral galaxies because it is more luminous]
n
(astronomy) An extended group of clusters of galaxies
n
(astronomy) A very large-scale magnetic eruption in the atmosphere of a star, possibly qualitatively different from more common, lesser solar flares.
n
A very large, extended cluster of galaxies.
n
(astronomy) A very large star having a mass between 10 and 70 solar masses.
n
(astronomy) A visible brightening observed during a superoutburst
n
(astronomy) a type of supergiant spiral galaxy of the local universe that is much larger than most giant spiral galaxies, and whose stellar creation rate is much higher than typical spiral galaxies because it is more luminous
n
(astronomy) A nebula that is formed from supernova explosion debris.
n
(astronomy) A large region carved out of the interstellar medium by the combination of several supernova shells, leading to a lower density of gas and plasma within that without, larger than any single supernova could create.
n
(astronomy) A very large void, especially one devoid of superclusters.
n
(astronomy) An outflow of highly energetic radiation and material from a starburst galaxy.
n
(astronomy, informal) A brown dwarf in Milky Way Galaxy, Local Group, Laniakea, Universe; A brown dwarf in interstellar space, thought to be the oldest brown dwarf yet discovered, and having the fastest brown dwarf galactic orbital velocity yet discovered, at the time of its discovery in 2021.
n
(astronomy) A relatively nearby spiral galaxy in the Local Group, together with the Milky Way galaxy. It is at a distance of approximately 2.6 million light years from Earth, in the direction of the constellation Triangulum.
n
(astronomy) Abbreviation of Virgo Supercluster. [(astronomy) The supercluster that includes the Milky Way galaxy.]
n
(astronomy) The supercluster that includes the Milky Way galaxy.
n
(astronomy) very low mass star
n
(astronomy) A cloud of ionized gas surrounding a galaxy
n
(astronomy) A sparse, warm-to-hot (105 to 107 K) plasma that cosmologists believe to exist in the spaces between galaxies and to contain 40–50% of the baryons in the universe at the current epoch.
n
Synonym of spiral galaxy
n
(astronomy) A dying star of low or medium mass, more solid and dense but less bright than the sun.
n
(astronomy, obsolete) a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century
n
(astronomy) Any of a class of young, very hot stars that have a very strong stellar wind and consequent broad, strong emission lines.
n
(astronomy) A supergiant star, of spectral type F or G, that is smaller than a red supergiant
n
(astronomy) The region of the Universe in alignment with the galactic plane of the Milky Way where few galaxies were initially seen due to dust interfering with the view of ground-based telescopes.
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