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NGC 1073 is a barred spiral galaxy in the constellation Cetus.The galaxy is estimated to be about 55 million light years from Earth, possess a disk spanning an estimated 80,000 light years in diameter, and likely contains a type of active core, called an HII nucleus.
M22 is one of only four globulars of our galaxy [c] known to contain a planetary nebula (an expanding, glowing gas swell from a massive star, often a red giant). It was an object first noted of interest using the IRAS satellite by Fred Gillett and his associates in 1986, as a pointlike light source [ d ] [ 16 ] and its nature was found in 1989 ...
List of galaxies with richest globular cluster systems; List of nearest galaxies; List of galaxies named after people; List of spiral galaxies; List of polar-ring galaxies; List of ring galaxies; List of quasars; Satellite galaxies. List of satellite galaxies of the Milky Way; List of Andromeda's satellite galaxies; List of Triangulum's ...
Galactic astronomy – deals with the structure and components of our Galaxy and of other galaxies. High energy astrophysics – studies phenomena occurring at high energies including active galactic nuclei, supernovae, gamma-ray bursts, quasars, and shocks. Interstellar astrophysics – study of the interstellar medium, intergalactic medium ...
Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. [5] It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years [ 3 ] from our galaxy , about 166,000 light-years in diameter.
Our own galaxy, the Milky Way, is a large disk-shaped barred-spiral galaxy [92] about 30 kiloparsecs in diameter and a kiloparsec thick. It contains about two hundred billion (2×10 11 ) [ 93 ] stars and has a total mass of about six hundred billion (6×10 11 ) times the mass of the Sun. [ 94 ]
The Local Sheet in astronomy is a nearby extragalactic region of space where the Milky Way, the members of the Local Group and other galaxies share a similar peculiar velocity. [2] This region lies within a radius of about 7 Mpc (23 Mly), [3] 0.46 Mpc (1.5 Mly) thick, [1] and galaxies beyond that distance show markedly different velocities. [3]
Group of at least 80 galaxies of which the Milky Way is a part. Dominated by Andromeda (the largest), the Milky Way and Triangulum; the remainder are dwarf galaxies. [39] Local Sheet: 7 Mpc 2.16×10 20: Group of galaxies including the Local Group moving at the same relative velocity towards the Virgo Cluster and away from the Local Void. [40] [41]
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