Word: geiger
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Dates: during 1970-1979
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Launched on Jan. 31, 1958, more than three months after the Soviet Union's 184-lb. Sputnik I, the 30.8-lb. Explorer had at first seemed a puny competitor for the huge Soviet satellites. But, equipped with a Geiger counter and two radio transmitters, it sent back evidence that had escaped the Russians -the data that enabled State University of Iowa Physicist James Van Allen to discover the radiation belts that bear his name...