protoplanetn.

Brit.

/ˈprəʊtə(ʊ)ˌplanɪt/, U.S.

/ˈproʊdoʊˌplænət/

Origin: Formed within English, by compounding. Etymons: proto- comb. form, planet n.

Etymology: < proto- comb. form + planet n.

Astronomy.

A large diffuse body of matter in the process of accretion in orbit around the sun or a star, postulated as a preliminary stage in the evolution of a planet.

ΘΚΠ

the world > the universe > planet > [noun] > protoplanet

protoplanet1948

1948 Science 23 Apr. 407/2 On their path through the large cloud, these proto-planets will sweep up matter with zero angular momentum and consequently spiral inward.

1971 I. G. Gass et al. Understanding Earth ix. 135/2 This conclusion suggests..that a considerable degree of fractionation had already taken place in the protoplanet before it condensed into a solid body.

2004 B. Bunch & A. Hellemans Hist. Sci. Tech. 674/1 Around the star Beta Pictoris..a disk of protoplanets, objects that will eventually crash into each other and fuse to form planets.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protoplanet
释义	protoplanetn. Brit. /ˈprəʊtə(ʊ)ˌplanɪt/, U.S. /ˈproʊdoʊˌplænət/ Origin: Formed within English, by compounding. Etymons: proto- comb. form, planet n. Etymology: < proto- comb. form + planet n. Astronomy. A large diffuse body of matter in the process of accretion in orbit around the sun or a star, postulated as a preliminary stage in the evolution of a planet. ΘΚΠ the world > the universe > planet > [noun] > protoplanet protoplanet1948 1948 Science 23 Apr. 407/2 On their path through the large cloud, these proto-planets will sweep up matter with zero angular momentum and consequently spiral inward. 1971 I. G. Gass et al. Understanding Earth ix. 135/2 This conclusion suggests..that a considerable degree of fractionation had already taken place in the protoplanet before it condensed into a solid body. 2004 B. Bunch & A. Hellemans Hist. Sci. Tech. 674/1 Around the star Beta Pictoris..a disk of protoplanets, objects that will eventually crash into each other and fuse to form planets. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1948
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