As a leading authority on the Arizona meteorite crater, Dr. Harvey H. Nininger is naturally interested in the moon, whose face has apparently been pocked by thousands of flying meteorites. In the current Sky and Telescope, Nininger speculates that one large meteorite may have blasted a tunnel through one of the moon's ridges.
Most experts believe, says Nininger, that the moon is covered with a thick blanket of meteoritic material, chips knocked off lunar rocks and other loose stuff. There is no water to help cement the fragments together, and the moon's gravitation is feeble. Pulverized lunar rock, he says, would weigh...
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