Hypothetical moons

thumb|right|Artist's impression of candidate exomoon Kepler-1625b I orbiting its planet.

thumb|Artist's concept of exomoon Kepler-1625b I orbiting exoplanet [[Kepler-1625b. Kepler-1625b I could theoretically have a subsatellite itself.|alt=]] A subsatellite, also known as a submoon or informally a moonmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet.

hypothetical natural satellite of Venus

claims that Earth may have other natural satellites

hypothetical moon of Saturn

supposed natural satellite orbiting Mercury

hypothetical natural satellite of Saturn

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