Ninety days after Sputnik humiliated American pride, a Jupiter-C rocket redesigned as Juno I hurled the 30-pound Explorer 1 into orbit. Built in a frantic 84 days by Jet Propulsion Laboratory and Army engineers under Wernher von Braun and William Pickering, the satellite carried a cosmic ray detector that led to the discovery of the Van Allen radiation belts, America's first true scientific triumph in space.
The launch came after a mortifying December failure, when the Navy's Vanguard rocket rose four feet, toppled, and exploded on live television while newspapers mocked it as 'Kaputnik' and 'Flopnik.' Pressure fell on the Army team led by Wernher von Braun, the former Nazi rocket engineer, who had been requesting permission to launch a satellite for over a year and was finally given the green light after Sputnik's twin shocks in October and November 1957.
At Cape Canaveral, the Juno I rocket ignited at 10:48 PM and streaked into the Florida night. Anxious minutes passed before ground stations in California confirmed the signal: Explorer 1 was in orbit, elliptical and tumbling, but alive. James Van Allen's cosmic ray instrument aboard the satellite soon revealed the belts of charged particles trapped by Earth's magnetic field that now bear his name, giving the mission genuine scientific weight beyond the political victory.
At a jubilant press conference, von Braun, Pickering, and Van Allen hoisted a model of the satellite over their heads for photographers. The image, printed in newspapers worldwide, became one of the enduring pictures of the Space Race's early, anxious years, and helped spur the creation of NASA later that same year.