最終更新日：2024/07/29

(astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.

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planetesimal

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planetesimal

noun

(astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.

Planetesimals are small celestial bodies that formed during the early stages of the solar system.

意味（1）

(astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.