JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Optical photograph of M45, the Pleiades open star cluster. The brighter stars of the cluster are embedded in a distinctive blue halo, caused by their starlight reflecting off dust particles in the cold gas around them. Only 400 light years from Earth, the Pleiades consists of some 300-500 stars, six or seven of which ("the seven sisters") are visible to the naked eye.
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