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Andromeda Galaxy
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M31 M110, Elliptical Galaxy, satellite of Andromeda Galaxy.
Hear about the prediction of the Milky Way colliding with the Andromeda galaxy, which might happen in about four billion years
Andromeda Galaxy The Andromeda Galaxy, a bright spiral galaxy with a glowing core and swirling arms, appears against a dense field of stars in deep space. Star cluster G1 (Mayall II) in the Andromeda Galaxy, as observed by the Hubble Space Telescope.
Learn about galaxy clusters, superclusters, and the Local Group
How the big-bang theory was developed
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M31
M31 M31, Andromeda Galaxy

Andromeda Galaxy

astronomy
Also known as: Andromeda Nebula, M31, NGC 224
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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•History

Andromeda Galaxy, (catalog numbers NGC 224 and M31), great spiral galaxy in the constellation Andromeda, the nearest large galaxy. The Andromeda Galaxy is one of the few visible to the unaided eye, appearing as a milky blur. It is located about 2,480,000 light-years from Earth; its diameter is approximately 200,000 light-years; and it shares various characteristics with the Milky Way system. It was mentioned as early as 965 ce, in the Book of the Fixed...

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