MPIA-HD, BIRKLE, SLAWIK / SCIENCE PHOTO LIBRARY MPIA-HD, BIRKLE, SLAWIK / SCIENCE PHOTO LIBRARY
Pleiades. Optical image of part of the Pleiades star cluster (M45) in the constellation Taurus, the bull. North is at top. This is a cluster of young stars thought to be around 50 million years old. It lies some 400 light years from Earth. Blue reflection nebulae surround some of the stars, which are thought to be the remnants of the gas cloud from which the stars formed.
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