Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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M81 Bode´s Galaxy, Luís Ramalho
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M81 Bode´s Galaxy, Luís Ramalho
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Description

The M81 (NGC 3031) is one of the largest and most beautiful spiral galaxies in our sky. The image shows a bright, almost stellar core, and large spiral arms (Type Sb). It is 11.8 million light years away and is part of the Ursa Major galaxy cluster. M81 was originally discovered by Johann Elert Bode on December 31, 1774 who described it as a "cloudiness" (Bode's nebula), along with the irregular galaxy M82. The actual diameter of the M81 is 36000 light years, has a luminosity equivalent to twenty billion suns and a total mass that approaches the 250 billion solar masses.

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M81 Bode´s Galaxy, Luís Ramalho

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