NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY
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Star cluster M23. Optical image of the open star cluster M23 (NGC 6494). The cluster of about 100 stars lies 2200 light years away in the constellation Sagittarius. It is over 200 million years old and is around 20 light years in diameter.
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