But the planetesimal hypothesis has no room for this enormous percentage of carbon-dioxide in the primitive atmosphere.

The inner satellite of Mars and the rings of Saturn make no special difficulty under the planetesimal hypothesis.

THE most elaborate structure yet proposed to explain the origin of the solar system is the planetesimal hypothesis by Chamberlin and Moulton.

This familiar view is challenged by the new " planetesimal hypothesis," which has been adopted by many distinguished geologists (Chamberlin, Gregory, Coleman, etc.).

Among the many that have been proposed the most elaborate is the '' Planetesimal Hypothesis'' of Professors Chamberlin and Moulton.

Such, then, is the mechanism of the first phase in the history of a spiral nebula according to the Planetesimal Hypothesis.