Selenology: Water on the Moon?

SELENOLOGY Water on the Moon? For a decade, McDonnell Douglas Geologist Jack Green has stoutly argued that there is water on the moon. Not free-flowing, gurgling water, to be sure, but water that is chemically locked within rock. Now, with the aid of a half-century-old observation, he reported to an American Institute of Aeronautics and Astronautics meeting in Los Angeles last week, he has found additional evidence of lunar water.

Green has long believed that most of the major lunar features are volcanic in origin. Since volcanic formations on earth contain hydrous rocks, Green reasons, they may well exist on the...