M 31 (Andromeda Galaxy)

作者：Jestr

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The Andromeda Galaxy (also known as Messier 31 or NGC 224) is an Sb-type barred spiral galaxy about 2.5 million light-years away in the constellation of the same name. Measuring around 220,000 light-years across, it is the largest galaxy of the Local Group. It is expected to collide with the Milky Way around 4-5 billion years into the future

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