NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Artwork of the Compton Observatory satellite (CO) formerly called Gamma Ray Observatory (GRO). CO is one of NASA's four Great Observatories, the others are the Hubble Telescope, the AXAF X-ray observatory and the SIRTF infra-red observatory. CO carries four experiments: the Oriented Scintillation Spectrometer Experiment (OSSE) looking at low- energy gamma rays; the Imaging Compton Telescope (Comptel) for medium energy gamma rays; the Energetic Gamma Ray Experiment Telescope (Egret) for highest energies; and the Burst and Transient Source Experiment (BATSE), designed for the shortest- lived events. CO was launched by Shuttle Atlantis on April 9th 1991.
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