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12.26.2008 | | Posted at 12:00 AM
By David Luhrssen
On Oct. 4, 1957 the world was startled when a new moon entered the Earth�s orbit. It was an artificial satellite, the first space probe, and its name was Sputnik. The US was frightened because its Cold War enemy, the Soviet Union, developed Sputnik in secret. If a Russian missile could send a satellite into space, could Soviet technology also rain nuclear warheads on American cities? Sp...