Although public interest in space has waned sharply since the moon landings, the U.S. is now engaged in perhaps the most ambitious exploration of the solar system since the start of the space age. At Cape Canaveral, NASA last week was preparing for the launch of the Skylab 3 mission, which may become the longest manned space flight. An unmanned U.S. craft, Pioneer 10, is closing in on Jupiter after a voyage of 20 months across more than half a billion miles of the solar system. Still another unmanned spacecraft, Mariner 10, is speeding...
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