NASA April 7, 1991, Deployment of Breakthrough Gamma-ray Observatory

Twenty-five years ago, NASA launched the Compton Gamma Ray Observatory, an astronomical satellite that transformed our knowledge of the high-energy sky. In this view, taken on April 7, 1991, from the aft flight deck window of space shuttle Atlantis, the Compton Gamma Ray Observatory is released by the shuttle's remote manipulator system. via NASA http://www.nasa.gov/image-feature/april-7-1991-deployment-of-breakthrough-gamma-ray-observatory