Explorer 5 was a US satellite designed to study the van allen radiation belts, however, the launch failed after the first stage collided with the second stage. August 24, 1958 at 06:17 UTC · Launch Failure Juno-I — Army Ballistic Missile Agency, to Medium Earth Orbit Launch Complex 5, Cape Canaveral SFS, FL, USA The world's 19th orbital launch attempt, and 16th of 1958. Data: Launch Library 2, The Space Devs. Image by NASA (NASA Image and Media Guidelines) via The Space Devs.