Subsatellite

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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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Science and technology

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What Wikipedia says

A subsatellite, also known as a submoon, moonlet or informally a moonmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet.

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

Image: NASA/JPL/JHUAPL, Public domain, via Wikimedia Commons.