Butterfly Cluster

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

The Butterfly Cluster (cataloged as Messier 6 or M6, and as NGC 6405) is an open cluster of stars in the southern constellation of Scorpius. Its name derives from the resemblance of its shape to a butterfly.

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

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