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Planetesimal
Solid objects in protoplanetary disks and debris disks / From Wikipedia, the free encyclopedia
Planetesimals (/ˌplænɪˈtɛsɪməlz/) are solid objects thought to exist in protoplanetary disks and debris disks. Believed to have formed in the Solar System about 4.6 billion years ago, they aid study of its formation.
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