NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY
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M37 open star cluster (NGC 2099), optical image. Open star clusters are small groups of stars that mostly formed recently from the same cloud of gas and dust. These young bright, blue stars are only loosely bound by gravity, and will eventually drift apart. M37 contains some 200 stars, is about 27 light years across and 4600 light years distant in the constellation Auriga. Photographed by the KPNO 0.9-metre telescope, Arizona, USA.
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