(science fiction) homeworld

plural of planetary gear train

(astronomy) Synonym of carbon planet

(astrology, astronomy) The seven non-fixed astronomical objects in the sky visible to the naked eye that where known in Ancient history

(astrology) A planet thought to bring bad luck to those born within its radius

Used other than figuratively or idiomatically: see tertiary, planet. (the third planet; usually counting outwards from the central sun)

plural of planetary nebula nucleus

(astronomy) The remnant hot luminous core of the stellar progenitor of the planetary nebula, which ionizes the surrounding planetary nebula.

plural of planetable

Alternative form of plane table