protoplanet

protoplanet

[proh-toh-plan-it]
noun Astronomy.
the collection of matter, in the process of condensation, from which a planet is formed.

Origin:
1945–50; proto- + planet

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Collins
World English Dictionary
protoplanet (ˌprəʊtəʊˈplænɪt)
 
n
a planet in its early stages of evolution by the process of accretion

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

protoplanet

in astronomical theory, a hypothetical eddy in a whirling cloud of gas or dust that becomes a planet by condensation during formation of a solar system. As the central body, or protostar, of the system contracts and heats up, the increasing pressure of its radiation is believed to drive off much of the thinner material of the protoplanets, particularly those closer to the nascent star

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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