Protoplanet Definition
prōtōplanit
protoplanets
noun
In some cosmological theories, any of the hundreds of swirling clouds of dust and gas that form around a star and eventually evolve into individual planets.
Webster's New World
An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets.
Wiktionary
Other Word Forms of Protoplanet
Noun
Singular:
protoplanet
Plural:
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