Definitions from Wiktionary (planetary object)

▸ noun:  (astronomy) Any secondary body in the Solar system that is geologically differentiated or in hydrostatic equilibrium and thus has a planet-like geology: a planet, dwarf planet, or the larger moons and asteroids.
▸ noun:  (astronomy) Any substantial body in orbit around the Sun or other star: a planet, minor planet, or comet.
▸ noun:  (astronomy) Any substantial body associated with the development of planets: a protoplanet, planetesimal.


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