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A 0.1–100 km body of rock and/or ice that is presumed to have formed in the early history of the Solar System. The planets are thought to have grown from the accumulation of planetesimals. Most planetesimals left over from planetary accretion were ejected by perturbations of the planets into the Kuiper Belt and Oort Cloud beyond Neptune.

Subjects: Astronomy and Astrophysics.

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