Exomoon

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A moon that is outside the Solar System (our solar system).

    "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."

Synonyms

All synonyms
exosolarexosolar moonextrasolarextrasolar moon

Example

More examples

"An exomoon is a moon that orbits around an exoplanet."

Etymology

From exo- + moon.

Related phrases

solar system

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.