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Center of M15

Center of M15

Messier 15 is one of the most highly compressed globulars in the sky. Astronomers using the Hubble Space Telescope found evidence that it has a black hole in the center. An unusual feature of M15 is Pease 1, the remains of an exploded star called a ''planetary nebula''. Only thee other globular clusters are known to contain a nebula like this one.

Credit: The Hubble Heritage Team (AURA/STScI/NASA)
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