M31 Andomeda Galaxy

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The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years away in the Andromeda constellation. Also known as Messier 31, M31, or NGC224, it is often referred to as the Great Andromeda Nebula. The Andromeda Galaxy is the nearest spiral galaxy to our Milky Way galaxy, but not the closest galaxy overall. The Andromeda Galaxy is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 30 other smaller galaxies. Although the largest, the Andromeda Galaxy may not be the most massive, as recent findings suggest that the Milky Way contains more dark matter and could be the most massive in the grouping. The 2006 observations by the Spitzer Space Telescope revealed that M31 contains one trillion stars at least.

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