TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY
Andromeda galaxy, optical image. Andromeda is the nearest large galaxy to our own. It measures around 140,000 light years across and is located 2.5 million light years away in the constellation of the same name. This image was assembled from 19 separate panels and took six months to create.
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