(astronomy) An astronomical object in direct orbit around the Sun that is not a planet or a comet.

Anyone who wishes to save the environment with an ambitious plan.

Alternative form of exoplanet

Any planet of the solar system or any exoplanet which is "Earth-like" in the sense that it is composed primarily of metals and rock, in contrast to a planet which is a gas giant.

(astronomy) A nebulosity surrounding a dying red giant, consisting of material expelled by the star.

plural of planetary ring

Someone interested in planespotting.

Alternative spelling of extraplanetary

plural of planespotter

superlative form of plane: most plane