JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Perseus double star cluster. Optical image of the double star cluster (centre left) located in the constellation of Perseus, around 7100 light years from Earth. Visible to the naked eye, the two clusters Chi Persei (NGC 884, centre left) and h Persei (NGC 869, lower left) lie only 50 light years apart and are believed to have formed from the same gas cloud around 15 million years ago.
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