Selenology: A Primordial Moon

No one was more disappointed than Nobel Laureate Harold Urey, 76, when the 55 Ibs. of lunar samples brought back by the Apollo 11 astronauts turned out to be igneous or heat-formed rock, possibly of volcanic origin. Long a champion of a "cold" moon—the theory that it has never had a molten core like the earth's—the University of California chemist sadly admitted that he could have been wrong. The moon, he conceded in the face of the rocks, might be hot, or geologically active, after all. "Poor old fellow," said one of NASA's younger geologists several weeks ago, "his...

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