protoplanet.
/proh-toh-plan-it/US // ˈproʊ toʊˌplæn ɪt //UK // (ˌprəʊtəʊˈplænɪt) //
原行星,原地行星,原生质体,原初行星
Definitions
n.noun · 名词
- 1.
Astronomy.
- ›the collection of matter, in the process of condensation, from which a planet is formed.
Examples
Then there are protoplanets, a planet that’s almost done forming.
During the chaos of the Bombardment Epoch, water from asteroids and volatile elements from the protoplanet fall to the gravitational attraction of a young planet Earth.
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