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

A carbon planet.

Beside an airplane; particularly used of baggage check or security searches

A position beside an airplane.

plural of planetary nebula

plural of planetary nebula

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 planetary system

(obsolete) astrologer / An inhabitant of a planet / An operator of a planetarium