If the Russians know why their space ship Luna 7 cracked up in its effort to make a soft landing on the moon last month, they are not telling. But Dr.
Anthony Barringer, a Canadian geophysicist, is unbothered by Soviet se crecy. At a symposium on remote sensing in Huntsville, Ala., last week, he theorized that Luna 7's radar may have failed to "see" a top porous layer of the moon's crust. As a result, the space ship crashed on its way to a landing on the hard lunar rock below.
When he...
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