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Definition of Protoplanet
1. Noun. 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 ¹
¹ Source: wiktionary.com
Definition of Protoplanet
1. [n -S]
Lexicographical Neighbors of Protoplanet
Other Resources:
Ido