plural of minor planet

plural of major planet

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.

plural of extrasolar planet

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

A carbon planet.

A planet that orbits the Sun within the orbit of the Earth, and thus does not show retrograde motion when viewed from Earth

A planet that orbits the Sun beyond the orbit of the Earth and thus shows retrograde motion when viewed from the Earth

plural of exosolar planet

(astrophysics) a planet that occupies a Trojan point of a star system