Wiktionary
planetesimals
n. (plural of planetesimal English)
Usage examples of "planetesimals".
Solar System was very young, and the crusts of Earth and other inner planets were still subject to bombardment from stray planetesimals - a ship came here.
In consequence of the inevitable intersection of the orbits of the planetesimals, nodes are formed where the flying particles meet, and at these nodes large masses are gradually accumulated.