The Moon is one of the more obvious of our neighbors in space and is certainly the most accessible. In spite of intensive analysis and probing by virtually every conceivable chemical and physical technique, the maneuvering room for speculation on lunar origin has scarcely diminished as a result of the Apollo program. This is not primarily due to lack of information but to the unexpected and confusing nature of the newly acquired data, most of which is open to multiple interpretations.

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