(science fiction, rare) Membership of a particular planet or moon, by origin, birth, naturalization, ownership, allegiance or otherwise.

Someone who helps protect the environment.

one of the bodies that orbit the sun

a planet with a moon large enough to be considered a planet, were the planet not there, having a substantial portion of the system's overall mass.

A carbon planet.

(astronomy) Any of the 8 celestial bodies which orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune (a celestial body that fits the 2006 IAU definition of planet).

(astronomy) A theoretical type of terrestrial planet that could form, if protoplanetary discs are carbon-rich and oxygen-poor.

plural of extrasolar planet

plural of minor planet

plural of major planet