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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
Literary usage of Protoplanet
Below you will find example usage of this term as found in modern and/or classical literature:
1. A Briefer History of Time: From the Big Bang to the Big Mac by Eric Schulman (1999)
""In order to get such a large moon we would have to smash a protoplanet a few
times more massive than Mars into the Earth. But I think the extra cost would ..."
Other Resources:
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