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Messier 4
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Globular cluster in the constellation Scorpius. Closest globular cluster.
Messier 4 is a globular cluster—a spherical collection of thousands of stars bound together by gravity—located in the constellation Scorpius. It's notable for being the closest globular cluster to Earth, making it an accessible target for astronomers studying these ancient stellar systems.
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Encyclopedic overview
Messier 4 or M4 (also known as NGC 6121 or the Spider Globular Cluster) is a globular cluster in the constellation of Scorpius. It was discovered by Philippe Loys de Chéseaux in 1745 and catalogued by Charles Messier in 1764. It was the first globular cluster in which individual stars were resolved.
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Excerpted from Wikipedia’s “Messier 4” article, available under the CC BY-SA 4.0 licence.
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