Planetesimal

Planetesimals are small, solid objects thought to exist in protoplanetary disks around a young or forming star. Planetesimals are created when dust particles collide.

Planetesimal Media

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Debris disks detected in HST archival images of young stars, HD 141943 and HD 191089, using improved imaging processes (24 April 2014).
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486958 Arrokoth, the first pristine planetesimal visited by a spacecraft.

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