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…
| 单词 | θ723 |
| 释义 | the world > the universe > planet > [noun] > protoplanet (1) protoplanet1948 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… |
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