protoplanet ( synonym found)
Definition of protoplanet:

°astronomical objects, 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.
Definition of protoplanet:

°astronomical objects, 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.
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