n
(astronomy) A structure formed by matter falling into a gravitational source such as a galaxy, black hole, or protostar.
n
(astronomy) A spherical shock wave that arises when material spirals inward to a gravitational source such as a star or black hole.
n
Any molecule that has been detected in interstellar or circumstellar space
n
(astronomy) The region of the Hertzsprung-Russell diagram populated by evolving low to medium-mass stars.
n
(astronomy) A lens-like component of a barred spiral galaxy whose extent along the bar major axis is shorter than the bar
n
(astrophysics) An explosion giving rise to a universe.
n
(astronomy) A pair of quasars which gravitationally interact with each other, unlike a standard double quasar, which does not interact.
n
(astronomy, cosmology) A theoretical early universe object, with the outer layers of a star and a black hole for a stellar core. Theorized to be born of an ultramassive pre-stellar nebula collapse to an ultramassive protostar, and later birthing an intermediate mass black hole when the star's life ends.
n
(astronomy) A very compact quasar, associated with a supermassive black hole at the center of an active galaxy.
n
(astronomy) The maximum theoretical mass of a white dwarf, approximately 1.4 solar masses.
n
(astronomy) A cloud of dust surrounding the nucleus of a comet.
n
(astronomy) A type of celestial body that collectively refers to white dwarfs, neutron stars, black holes and exotic stars.
n
(astrobiology, astronomy) the restricted zone around a sun where the ever shifting habitable zone is always present throughout the main sequence lifetime of that star.
n
(science fiction) A solid shell of matter enclosing a star.
n
(astronomy) A quadruply replicated image of a quasar, in the configuration of a cross, surrounding a central foreground galaxy which caused the replication through gravitational lensing.
n
(astronomy) An event that ends the fusion lifetime of a large and massive star. It is a partial type-II supernova, where the collapse process occurs, but no significant rebound occurs, and the nascent black hole swallows the incoming implosion resulting in no outbound explosion or subsequent light burst.
n
(astronomy) A region of the galaxy, rich in gamma rays, thought to be caused by the central supermassive black hole
n
(physics, astronomy) A massive, thread-like structure, such as those gaseous ones which extend outward from the surface of the sun, or such as those (much larger) ones which form the boundaries between large voids in the universe.
n
The formation of a galaxy.
n
(physics, astronomy) The phenomenon of a star rotating so rapidly that it is oblate, with a larger radius and thus lower surface gravity at the equator (which is thus cooler and darker: gravity-darkened), and higher surface gravity at the poles (which are hotter and brighter: gravity brightened).
n
(astronomy) An apparent gravitational anomaly in intergalactic space at the center of the local Laniakea Supercluster, in which the Milky Way is located. It suggests a localized concentration of mass thousands of times more massive than the Milky Way.
n
(astronomy) Much greater than normal accretion, typically around a stellar black hole.
adj
(astronomy) Describing a dense cluster of stars around a supermassive black hole
n
(astronomy, very rare) An extraordinarily powerful, massive flare, usually produced by a magnetar.
n
(astronomy, rare) The property or state of being hypermassive.
n
(astronomy) Isolated neutron star.
n
(astronomy) A type of supernova that is underluminous, caused by the merger of two neutron stars
n
(astronomy) A neutron star or pulsar with an extremely powerful magnetic field, especially those on which starquakes occur, thought to be the source of some gamma-ray bursts.
n
Alternative spelling of magnetodisc [(astronomy) A disc-shaped magnetosphere]
n
(astrophysics) a supermassive rotating highly magnetized star at the center of a compact galactic nucleus.
n
(astronomy) mass concentration
n
(astronomy) A stellar outburst about one millionth the strength of a classical nova.
n
(astronomy) A degenerate star that has been so collapsed by gravity that its electrons and protons have been merged into neutrons by the intense pressure. The solid mass of neutrons is sometimes called neutronium.
n
(astronomy) A radio signal which appears to come from outside the galaxy but is actually produced by terrestrial sources.
n
(stars) The degenerate core of a massive star, prior to its emergence after a supernova as a neutron star.
n
(astronomy) A morphological feature of some spiral galaxies that appears similar to a conventional galaxy bulge, but with internal dynamics that are dominated by rotation rather than random motions.
n
(astronomy) A rotating neutron star that emits radio pulses periodically.
n
M87* (“Messier 87*”), the central supermassive blackhole of the galaxy Messier 87.
n
Alternative form of quasi-stellar radio-source [(astronomy) a quasar]
n
(astronomy) A diffuse region of material, surrounding a galaxy or a pulsar, that emits radio waves
n
Alternative spelling of radio nebula [(astronomy) Any nebula that emits radio waves]
n
(astronomy) A type of nova in which the sudden brightening and gradual diminishing is repeated (for any of several reasons)
n
(astronomy) The black hole located at the center of the Milky-Way Galaxy.
n
The central supermassive black hole of the Milky Way Galaxy.
n
(astrophysics) Ellipsis of SANE disc. A type of black hole accretion disc.
n
(astronomy) A unit, equal to the mass of the sun, used to express the mass of other stars etc. 1 M_☉ = 2 × 10³⁰ kg.
n
(astronomy) A rapidly-rotating supermassive star, once hypothesized as the identity of quasars
n
(astronomy) A clump of dark matter in a subhalo.
n
(astronomy) A very large collapsar
n
(astronomy) The explosion of a star, which increases its absolute magnitude to typically a billion times that of our sun. Some leave only debris, while others fade to invisibility as neutron stars or black holes.
n
(astronomy) a star that is fainter than 7th magnitude in apparent magnitude, and therefore in most cases is not visible to the naked eye.
n
(astronomy) A star that contains a core made from another star. It is formed when a neutron star collides with a star, typically a red giant or supergiant, and the neutron star is swallowed by the red giant star.
n
Alternative form of Thorne-Zytkow object [(astronomy) A star that contains a core made from another star. It is formed when a neutron star collides with a star, typically a red giant or supergiant, and the neutron star is swallowed by the red giant star.]
n
(astronomy) a pair of quasar images formed by gravitational lensing of a single physical quasar
n
(astronomy) The collapse, as opposed to a supernova explosion, of a star hypothetically forming a black hole.
n
(astronomy) a protium-fusing star with minimal mass, which is fully convective, able to process its entire hydrogen supply
n
(astronomy) An ionization or light echo, especially the quasar ionization echo known as Hanny's Voorwerp.
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