A contracting mass of gas representing an early stage in the formation of a star, before the star is dense enough to sustain nuclear reactions.
单词 | θ853 |
释义 | the world > the universe > star > kind of star > protostar > [noun] (1) protostar1948 A contracting mass of gas representing an early stage in the formation of a star, before the star is dense enough to sustain nuclear reactions. |
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