Explorer 4 - Space launch mission detailed information
Explorer 4 4
26 JUL 1958
Army Ballistic Missile Agency
Launch Complex 5
An American satellite in order to study the Van Allen radiation belts and the effects of nuclear explosions upon these belts.
The Juno I was a four-stage American booster rocket which launched America's first satellite, Explorer 1 in 1958. A member of thr redstone family, it was derived from the Jupiter-C sounding rocket.