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Daniel Pasternak Aug 13 2015 7

The Andromeda Galaxy is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. Also known as Messier 31, M31, or NGC 224, it is often referred to as the Great Andromeda Nebula in older texts. The Andromeda Galaxy is the nearest major galaxy to the Milky Way. It gets its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. The Andromeda Galaxy is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 44 other smaller galaxies.

 

 

The Andromeda Galaxy is the most massive galaxy in the Local Group as well. Despite earlier findings that suggested 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 Andromeda contains one trillion stars: at least twice the number of stars in the Milky Way, which is estimated to be 200–400 billion.

 

C-11 CGEM-DX un-guided, Hyperstar F/2 lps2 filter – Canon 450d full spec

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Uploaded on August 14, 2015