22 relations: Anemic galaxy, Celestial coordinate system, Elliptical galaxy, Epoch (astronomy), Gérard de Vaucouleurs, Guillaume Bigourdan, Hydra (constellation), Hydra Cluster, Interstellar medium, Intracluster medium, John Herschel, Light-year, List of NGC objects (3001–4000), Low-ionization nuclear emission-line region, Messier 90, New General Catalogue, NGC 3309, NGC 3311, NGC 4921, Pan-STARRS, Ram pressure, Spiral galaxy.
Anemic galaxy
An anemic galaxy is a type of spiral galaxy characterized by a low contrast between its spiral arms and its disk.
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Celestial coordinate system
In astronomy, a celestial coordinate system is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on.
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Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Gérard de Vaucouleurs
Gérard Henri de Vaucouleurs (25 April 1918 – 7 October 1995) was a French astronomer.
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Guillaume Bigourdan
Camille Guillaume Bigourdan (6 April 1851 – 28 February 1932) was a French astronomer.
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Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.
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Hydra Cluster
The Hydra Cluster (or Abell 1060) is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra.
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Interstellar medium
In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy.
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Intracluster medium
In astronomy, the intracluster medium (ICM) is the superheated plasma that permeates a galaxy cluster.
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John Herschel
Sir John Frederick William Herschel, 1st Baronet (7 March 1792 – 11 May 1871) was an English polymath, mathematician, astronomer, chemist, inventor, experimental photographer who invented the blueprint, and did botanical work.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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List of NGC objects (3001–4000)
This is a list of NGC objects 3001–4000 from the New General Catalogue (NGC).
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Low-ionization nuclear emission-line region
A low-ionization nuclear emission-line region (LINER) is a type of galactic nucleus that is defined by its spectral line emission.
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Messier 90
Messier 90 (also known as M90 and NGC 4569) is an intermediate spiral galaxy exhibiting a weak inner ring structure about 60 million light-years away in the constellation Virgo.
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New General Catalogue
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.
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NGC 3309
NGC 3309 is a giant elliptical galaxy located about 200 million light-years away in the constellation Hydra.
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NGC 3311
NGC 3311 is a supergiant elliptical galaxy (a type-cD galaxy) located about 190 million light-years away in the constellation Hydra.
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NGC 4921
NGC 4921 is a barred spiral galaxy in the Coma Cluster, located in the constellation Coma Berenices.
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Pan-STARRS
The Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1; obs. code: F51 and Pan-STARRS 2 obs. code: F52) located at Haleakala Observatory, Hawaii, USA, consists of astronomical cameras, telescopes and a computing facility that is surveying the sky for moving or variable objects on a continual basis, and also producing accurate astrometry and photometry of already detected objects.
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Ram pressure
In physics, ram pressure is a pressure exerted on a body moving through a fluid medium, caused by relative bulk motion of the fluid rather than random thermal motion.
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Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
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References
[1] https://en.wikipedia.org/wiki/NGC_3312