Planetesimal
Solid objects in protoplanetary disks and debris disks
Planetesimal
Planetesimals () 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.
Read on Wikipedia · Image NASA/ESA, R. Soummer, Ann Feild (STScI), Public domain
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