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M81
M81 or M-81 may refer to: * M-81 (Michigan highway), a state highway in Michigan * McDonnell-Douglas MD81 * Messier 81, a spiral galaxy in the constellation Ursa Major, also known as NGC 3031 or Bode's Galaxy * U.S. Woodland, a camouflage pattern colloquially known as "M81" {{Letter-NumberCombDisambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Messier 81
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 1 E22 m, 12 million light-years away in the constellation Ursa Major. It has a Galaxy#Isophotal diameter, D25 isophotal diameter of . Because of its relative proximity to the Milky Way galaxy, large size, and active galactic nucleus (which harbors a 70 million supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy's large size and relatively high brightness also makes it a popular target for Amateur astronomy, amateur astronomers. In late February 2022, astronomers reported that M81 may be the source of Fast radio burst#FRB_20200120E, FRB 20200120E, a repeating fast radio burst. Discovery Messier 81 was first discovered by Johann Elert Bode on 31 December 1774. Thus, it is sometimes referred to as "Bode's Galaxy". In 1779, Pierre Méchain and Charles Messier reidentified Bode's object, hence listed it in the Messier object, Messie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
