Messier 21

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What Wikipedia says

Messier 21 or M21, also designated NGC 6531 or Webb's Cross, is an open cluster of stars located to the north-east of Sagittarius in the night sky, close to the Messier objects M20 to M25 (except M24). It was discovered and catalogued by Charles Messier on June 5, 1764.

Excerpt from the Wikipedia article “Messier 21”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ole Nielsen, CC BY-SA 2.5, via Wikimedia Commons.