1970: The USAF launched two Vela nuclear-detection satellites from the Eastern Test Range on a Titan III-C booster. Each 700-pound satellite carried optical sensors to detect electromagnetic impulses, or brief radio signals generated by atomic explosions anywhere in the atmosphere. Sensors could also detect atomic weapons tests up to 100 million miles in space and distinguish between weapons tests and exploding stars. They were the last two Vela satellites launched in the program. IMAGE: The fifth pair of Vela satellites ready for launch on a Titan III C, 1969. (Sandia Labs photo)
