(astronomy, planetology) a planetary-mass object which has either been ejected from its system or was never gravitationally bound to any star or other such object, and that therefore orbits the galaxy directly.

A gear wheel that revolves around the wheel with which it meshes, in an epicyclic train.

plural of interstellar planet

plural of planet wheel

Earth; the third planet in the Solar System

plural of exo-planet

plural of planet gear

(engineering) An epicyclic gear; the middle gears in a planetary gear system, spun by the central sun gear

plural of Goldilocks planet

Synonym of exoplanet