STS-37, the eighth flight of the Space Shuttle Atlantis, was a six-day mission with the primary objective of launching the Compton Gamma Ray Observatory (GRO), the second of the Great Observatories program which included the visible-spectrum Hubble Space Telescope, the Chandra X-ray Observatory and the infrared Spitzer Space Telescope. The mission also featured two spacewalks, the first since 1985.
Read more about STS-37: Crew, Mission Parameters, Preparations and Launch, Compton Gamma Ray Observatory, Spacewalks, Additional Payloads and Experiments, Landing, Mission Insignia