what is planetesimal mean?
noun 1. one of the small celestial bodies that, according to one theory (planetesimal hypothesis) were fused together to form the planets of the solar system . adjective 2. of ... - read more
Planetesimals / p l æ n ɨ ˈ t ɛ s ɨ m əl z / are solid objects thought to exist in protoplanetary disks and in debris disks. A widely accepted theory of planet formation, the so-called planetesimal hypothesis of Viktor Safronov, states that planets form out of cosmic dust grains that ... - read more
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