Second test flight of the Space Shuttle to demonstrate safe re-launch and safe return of the orbiter and crew. Verify the combined performance of the entire shuttle vehicle – orbiter, solid rocket boosters and external tank. Payloads included the Orbital Flight Test Pallet consisting of the Measurement of Air Pollution from Satellite (MAPS) experiment, the Shuttle Multispectral Infrared Radiometer (SMIRR) experiment, the Shuttle Imaging Radar (SIR-A) experiment, the Features Identification and Location Experiment (FILE) and the Ocean Color Experiment (OCE). Also included was the 11,048 lb. Development Flight Instrumentation (DFI) pallet, the Aerodynamic Coefficient Identification Package (ACIP), the Induced Environment Contamination Monitor (IECM) and the 5,395 lb. Office of Space and Terrestrial Applications Pallet (OSTA-1).