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Messier 15 is a dense, spherical collection of hundreds of thousands of old stars held together by gravity, located about 35,000 light-years away in the constellation Pegasus. Astronomers study it to better understand how stars form and evolve in these ancient stellar systems, and it's notable for containing a planetary nebula—a rare feature for a globular cluster.
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Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764. At an estimated 12.5±1.3 billion years old, it is one of the oldest known globular clusters.
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