星系
仙女座星系 (M31)
Andromeda Galaxy (M31)
The most distant object visible to the naked eye
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简介
Andromeda is the nearest large spiral galaxy, about 2.5 million light-years away. The light we see tonight left it when the first humans of the genus Homo were appearing on Earth.
你知道吗？
It is approaching the Milky Way: in a few billion years the two galaxies will interact.