Examples from the Web for planetesimal
The Planetesimal Theory suggests that these thickened knots are embryo planets and the central portion of the nebul an embryo sun.The Meaning of Evolution|Samuel Christian Schmucker
Such, then, is the mechanism of the first phase in the history of a spiral nebula according to the Planetesimal Hypothesis.Curiosities of the Sky|Garrett Serviss
But the planetesimal hypothesis has no room for this enormous percentage of carbon-dioxide in the primitive atmosphere.
In deference to the opinion of a number of geologists we must glance once more at the alternative view of the planetesimal school.
Let us now inquire briefly into the bearing of this planetesimal hypothesis upon the early geological history of the earth.Geology|William J. Miller