America launched its first satellite, Explorer 1, #OTD in 1958, a mere four months after the Soviets launched Sputnik. But what if the Navy's December 1957 launch of Vanguard had been successful? Would NASA have been created? Travel back to the 1950s with this Explorer 1 documentary on NASA ▶️ https://go.nasa.gov/4hcf5Kk | NASA History

EarthSky | 1st US satellite – Explorer 1 – launched 64 years ago this week