Thirteenth Discovery flight. The Upper Atmosphere Research Satellite (UARS) will study physical processes acting within and upon the atmosphere, mesosphere, and lower thermosphere. Landed at Edwards Air Force Base, CA. on September 18, 1991. Mission Duration: 128 hours 27 minutes 51 seconds.
Launch Date: September 12, 1991 Launch Vehicle: Discovery Crew: Commander: James O. Creighton, Pilot:Kenneth S. Reightler, Mission Specialists: Mark F. Brown, James F. Buchli, Charles D. Gemar,