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The Pleiades

Perhaps the most famous star cluster on the sky, the Pleiades ("flock of doves") can be seen without binoculars from even the depths of a light-polluted city. Also known as the Seven Sisters and M45, the Pleiades is the brightest and closest open cluster. The Pleiades contains over 3000 stars, is 440 light years away, and only 13 light years across. Quite evident in the above photograph are the blue reflection nebulae that surround the brighter cluster stars. Low mass, faint, brown dwarfs have also been found in the Pleiades.

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The names of the stars are shown below. Atlas and Pleione are the parents of the Seven Sisters, who are to the right.