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Globular star cluster M15, optical image. This is a ball of hundreds of thousands of stars, which lies around 33,000 light years from Earth in the constellation Pegasus. Most of the stars are hot, small blue-white stars, although numerous red giants and older stars nearing the ends of their lives are also seen. M15 is one of the largest and brightest globular star clusters. Globular clusters are found in a halo around the Milky Way galaxy.
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