Messier 4

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Messier 4”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, STScI, WikiSky, Public domain, via Wikimedia Commons.