Andromeda galaxy is also commonly referred to by other names Messier 31, M31, or NGC 224 is one of the galaxies outside the Milky Way galaxy that is visible to the naked eye, provided that seen on a clear night, no moon and no light pollution. The structure is similar to the Milky Way galaxy is a spiral-shaped. The distance is about 2.5 million light-years away. Is located in the northern hemisphere skies, about 41 degrees to the north of the equator, both observed around September, October, November.
With the naked eye, This galaxy looks like a small thin haze in the northern sky, but when observed through binoculars that can reveal dim stars at the edge of the Andromeda galaxy, Andromeda was the size can be more than 7 times the diameter point of the month. This galaxy contains about one trillion stars, and moved closer to The Milky Way with speeds around 300 km / sec.
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