Light from Andromeda to Earth

The nearest large galaxy to the Milky Way is the Andromeda Galaxy. Sometimes astronomers call it M31, by its number in the famous Messier catalog of fuzzy celestial objects. The Andromeda … Galaxy lies about 2 1/2 million light years from Earth. The light we see from it tonight left it more than 2 million years ago, when our species was just beginning to establish its fragile foothold on planet Earth.

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