A few months after the USSR launched Sputnik, the US's first satellite, Explorer 1, was launched into space #OTD in 1958. Explorer 1 measured the radiation environment in Earth orbit, leading to the discovery of the Van Allen Belts.
Watch the news reel: archive.org/details/1958-02-03…
#NASAhistory
First U.S. Satellite Launched! 1958/02/03 : Free Download, Borrow, and Streaming : Internet Archive
(1) Cape Canaveral launch of 30-pound Explorer satellite by 3-stage Redstone missile, press conference with von Braun and Van Allen with model, night time...Internet Archive
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