Abstract

“It has been my belief that the moon is an ancient object, probably captured by Earth at the beginning of terrestrial history. If this is the case, it must have been made somewhere, independent of the Earth, and would therefore be an independent planet and an exceedingly interesting object.”This article is based on the revision by Professor G. J. F. MacDonald and Professor Urey of “The Origin and History of the Moon,” the chapter by Dr. Urey in “The Physics and Astronomy of the Moon,” edited by Zdenek Kopal. Dr. Urey is Professor-at-large of Chemistry at the University of California, San Diego, Revelle College, La Jolla, California.

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