Exoom

Exoom is a neologism that has appeared in speculative writing and discussions but is not officially defined in astronomy. The term is formed from the exo- prefix, indicating relation to exoplanets or planetary systems outside the Solar System, and a moon-like suffix, implying a satellite or moon-analogue. Because there is no standardized definition, the meaning of exoom varies by author and context.

In fiction and conceptual discussions, exoom is sometimes used to describe a hypothetical small satellite associated with an exoplanet, such as a moon-like body orbiting an alien planet, or a compact interstellar object thought to originate from an exoplanetary system. In some worldbuilding contexts, exooms may be imagined as distant, secluded satellites with unusual properties or orbits.

In formal science, exoom has little or no standing as a category; researchers typically refer to exomoons, exoplanets, or interstellar visitors rather than using exoom. The term thus remains primarily a speculative or literary construct rather than a defined scientific class.

See also: Exoplanet, Exomoon, Interstellar object, Oumuamua.