WE leave as we came and, God willing, we shall return with peace and hope for all mankind." As he uttered those hopeful and heartfelt words, Apollo 17's commander, Gene Cernan, stepped from the surface of the moon and clambered up the ladder of lunar module Challenger. Cernan's departure may not be remembered as long as Neil Armstrong's historic arrival three years ago. Nonetheless it was a profound and moving moment that was put in perspective by a presidential pronouncement: "This may be the last time in this century," said Richard Nixon, "that...
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