Galaxy group

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

A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters.

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

Image: Judy Schmidt, CC BY 2.0, via Wikimedia Commons.