Galileo spots some of Jupiter's moons, the Harlem Globetrotters play their first game, Truman announces the development of the H-bomb, and President Clinton's impeachment trial begins, all on this day.
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U.S. Air Force
1960: At the Cape Canaveral, Fla., missile test base, the Polaris missile is launched for the first time. The two-stage solid-fuel nuclear-armed submarine-launched ballistic missile would remain in service by the U.S. Navy and the British Royal Navy from 1961 through 1996.