OSO (Orbital Solar Observatory) satellite. Its purpose was to return data on the ultraviolet, X-ray and gamma ray emissions of the sun and galaxy. August 25, 1965 at 15:17 UTC · Launch Failure Thor Delta C — United States Air Force, to Low Earth Orbit Space Launch Complex 17B, Cape Canaveral SFS, FL, USA The world's 471st orbital launch attempt, and 78th of 1965. Data: Launch Library 2, The Space Devs. Image by NASA (NASA Image and Media Guidelines) via The Space Devs.