M13 The Hercules Cluster

Messier 13, or M13 is a globular cluster of several hundred thousand stars in the constellation of Hercules. It  was discovered by Edmond Halley in 1714 and cataloged by Charles Messier on June 1, 1764. Messier 13 is often described by astronomers as the most magnificent globular cluster visible to northern observers. About 145 light-years in diameter, M13 is composed of several hundred thousand stars, with estimates varying from around 300,000 to over half a million. The brightest star in the cluster is a red giant also known as V1554 Herculis. Messier 13 may be visible to the naked eye with averted vision on dark nights. 

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