In science fiction, this term is generalised to every celestial body matching the definition and orbiting around any star (whereas the correct word should be “exoplanet”).
Science's success did not need a God to explain it; the world was enough.Gregory Benford
A.I. Anticipation Astronomy Award Chess Cyberpunk Dystopia Elévation Extraterrestrial Fantastic Fantasy FTL Hard Science Heroic Fantasy Horror Hugo I.A. Light Fantasy Locus Marvel Murder Mutant Nebula Planet opera Post-apo Prison Robot S.F. Science Science fiction Seiun Space Fantasy Space opera Space structure Star Trek Star Wars Steampunk Superhero Superpower Sword and Sorcery Technology Techobabble Three Laws Time travel War