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.
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Moon moon? “Undiscovered”?
Terms used in scientific literature for subsatellites include “submoons” and “moon-moons”. Colloquial terms that have been suggested include moonitos, moonettes, and moooons.[6]
I’m partial to moooons.
