JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Optical photograph of a field of stars in the constellation of Andromeda, with the M31 spiral galaxy, the Andromeda Galaxy, at centre right. Amateur photograph, taken with a 105mm Nikkor lens at f/2.8 on a 20-minute expos- ure from Lockwood Valley, California.
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