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For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31. Further inclusions followed; the first addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding Messier's side note in his 1781 edition exemplar of the catalogue.
Messier 105 is known to have a supermassive black hole at its core whose mass is estimated to be between 1.4 × 10 8 and 2 × 10 8 M ☉. [11] The galaxy has a weak active galactic nucleus of the LINER type with a spectral class of L2/T2, meaning no broad Hα line and intermediate emission line ratios between a LINER and a H II region. [12]
MAXI — Monitor of All-sky X-ray Image; Mayall — Nicholas Mayall (for example: globular star cluster Mayall II orbiting Messier 31, the Andromeda galaxy) Mayer (open star clusters) McC — McCormick Observatory Catalog; MCG — Morphological Catalogue of Galaxies; MCW — Morgan, Code, and Whitford [26] Me — Merrill (planetary nebulae)
Messier 81 is the largest galaxy in the M81 Group, a group of 34 in the constellation Ursa Major. [28] At approximately 11.7 Mly (3.6 Mpc ) from the Earth, it makes this group and the Local Group , containing the Milky Way , [ 28 ] relative neighbors in the Virgo Supercluster .
Messier 102 (also known as M102) is a galaxy listed in the Messier Catalogue that cannot be unambiguously identified. Its original discoverer Pierre Méchain retracted his discovery two years after publication and said that it was a duplicate observation of Messier 101 . [ 1 ]
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Evil Eye Galaxy, M64, NGC 4826, PGC 44182, UGC 8062 [11] The Black Eye Galaxy (also called Sleeping Beauty Galaxy or Evil Eye Galaxy and designated Messier 64 , M64 , or NGC 4826 ) is a relatively isolated [ 7 ] spiral galaxy 17 million light-years away in the mildly northern constellation of Coma Berenices .
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