An exomoon is a moon that orbits around an exoplanet.
Source: tatoeba (3216171)
Exomoon
Synonyms for "exomoon"
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Sample sentences
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Researchers have detected the first "exomoon" candidate—a moon orbiting a planet that lies outside our solar system.
Source: tatoeba (11999358)
Of course we can't detect exomoons now (or for a long while), but could planets like 51 Peg b have any moons? Wouldn't the star strip them off? I don't suppose there can be a moon around a planet that orbits in more time than it takes that planet to orbit its star.
Source: wiktionary
Now we get exoplanets, dwarf planets, rogue planets, and (exo)moons. That's ok, but then comes the utter silliness: none of them are planets. Even those bigger than Jupiter aren't planets.
Source: wiktionary