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planetary object. In DICTIOUS you will not only get to know all the dictionary meanings for the word
planetary object, but we will also tell you about its etymology, its characteristics and you will know how to say
planetary object in singular and plural. Everything you need to know about the word
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English
Noun
planetary object (plural planetary objects)
- (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.
- (astronomy) Any substantial body in orbit around the Sun or other star: a planet, minor planet, or comet.
- (astronomy) Any substantial body associated with the development of planets: a protoplanet, planetesimal.
Usage notes
The phrase is often used for an unidentified body known to have complex geology, such as the unknown parent body of a meteorite.
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