S73-7 may have disappeared into a radar blind spot
(Newser) -
A small, experimental satellite launched in failure in 1974 and lost to ground-based sensors for a quarter century has suddenly reappeared. On April 10, 1974, the large reconnaissance satellite KH-9 Hexagon ejected a much smaller, 26-inch-wide satellite, the Infra-Red Calibration Balloon or S73-7, which was supposed to inflate a balloon...