n
(astronomy) Initialism of asymptotic giant branch. [(astronomy) The region of the Hertzsprung-Russell diagram populated by evolving low to medium-mass stars.]
n
(astronomy) Abbreviation of Atacama Large Millimeter Array (a telescope in Chile)
n
(astronomy) Abbreviation of broad emission-line quasar.
n
(uncountable, astronomy, cosmology, astrophysics) Abbreviation of cosmic gravitational-wave background. [The stochastic background of gravitational waves produced during the creation of the universe.]
n
Alternative form of cosmic gravitational-wave background [The stochastic background of gravitational waves produced during the creation of the universe.]
n
(astronomy) Acronym of double radio-source associated with a galactic nucleus.
n
(uncountable, astronomy) Abbreviation of extragalactic background light. [All the accumulated radiation in the universe due to star formation processes, plus a contribution from active galactic nuclei (AGNs).]
n
(astronomy) Abbreviation of extragalactic medium.
n
(astronomy) Acronym of fast-evolving luminous transient. (a type of supernova) [(astronomy) A type of weak supernova whose luminous shell cools quickly and within days goes dark]
n
(astronomy) A flash of gamma rays that seem to originate from a random point in the sky; their most likely sources are believed to be supernova explosions of a very massive stars and mergers of neutron stars.
n
(astronomy) GJ the prefix of catalog entries in the Gliese star catalog, for the Gliese-Jahreiss expansion
n
(astronomy) the prefix of catalog entries in the Gliese star catalog, for initial catalog
n
(astronomy) Initialism of gamma-ray burst. [(astronomy) A flash of gamma rays that seem to originate from a random point in the sky; their most likely sources are believed to be supernova explosions of a very massive stars and mergers of neutron stars.]
n
Initialism of giant radio galaxy. [(astronomy) a very large radio galaxy; a double radio source having an overall projected linear length exceeding 2 megaparsecs (or more specifically, 2×h₅₀⁻¹ Mpc)]
n
(uncountable, astronomy, cosmology, astrophysics) Abbreviation of gravitational wave background.
n
(astronomy) Abbreviation of hyperluminous infrared galaxy.
n
(astronomy) Abbreviation of Hertzsprung-Russell diagram. [(astronomy) A graphic representation of the absolute magnitude of stars against their color (or surface temperature), which shows the main sequence of stars plus the white dwarfs and red giants.]
n
(astronomy) Abbreviation of interstellar medium. [(astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays.]
n
(astronomy) Abbreviation of accretion luminosity.
n
(astronomy) A pulsar designation.
n
Abbreviation of Local Interstellar Cloud. [An interstellar cloud in Orion Spur, Perseus Arm, Milky Way Galaxy, where the Solar System is currently located, and is passing through.]
n
(astronomy) Acronym of luminous infra-red galaxy.
n
Initialism of luminous red galaxy.
adj
(chemistry, physics, astronomy) Alternative form of Lα (Lyman-alpha, Lyman alpha) [(chemistry, physics, astronomy) Lyman alpha or Lyman-alpha]
n
(countable) Alternative spelling of LyC (Lyman continuum photon)
n
(astronomy) A series of absorption lines in the spectra of distant galaxies and quasars, arising from the Lyman-alpha electron transition of the neutral hydrogen atom.
adj
(chemistry, physics, astronomy) Lyman alpha or Lyman-alpha
n
(astronomy) Lyman-alpha emitter
n
(astronomy) Abbreviation of MAssive Cluster Survey. A survey for a statistically complete sample of distant (0.7>z>0.3) very X-ray luminous massive clusters of galaxies (“galaxy clusters”), culled from the ROSAT Bright Source Catalogue of X-ray sources
n
(astronomy) Abbreviation of number of ultra-luminous X-ray sources. a count of ULX sources within a galaxy
n
(astronomy, telescope) Acronym of Panoramic Survey Telescope & Rapid Response System (an automatic telescope to discover and characterize Earth-approaching objects that might pose a danger)
n
(astronomy) Abbreviation of pulsar. [(astronomy) A rotating neutron star that emits radio pulses periodically.]
n
(dated) A radio-quiet quasar.
n
Alternative form of quasi-satellites.
n
(astronomy) Initialism of radio galaxy. [(astronomy) Type of galaxy that is very luminous at radio wavelengths.]
n
(astronomy) Initialism of Tip of the Red Giant Branch.; A classification of stars on the Hertzsprung-Russell diagram for all stellar populations or of a given sample set, the end of the plot for stars existing on the red giant branch as it branches off from the main sequence.
n
(astronomy) Acronym of ultra-luminous infra-red galaxy.
n
(astronomy) Abbreviation of ultra-luminous pulsar.
adj
(astronomy) Abbreviation of ultra-luminous X-ray. (the individual X-rays are not ultraluminous)
n
(initialism) Weak emission-line radio-galaxy.
n
(astronomy) Initialism of Wolf-Rayet star. [(astronomy) Any of a class of young, very hot stars that have a very strong stellar wind and consequent broad, strong emission lines.]
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