Space Shuttle Challenger lifts off on a satellite delivery mission, but the launches of both satellites go awry when their boosters (the Payload Assist Modules designed to launch satellites from the shuttle) put them in the wrong orbits. A German satellite is retrieved, repaired, and placed back into its orbit. A few days after launch, a member of Challenger’s crew will become the first free-floating human satellite. On this flight, Challenger’s crew consists of Commander Vance Brand, Pilot Robert Gibson, mission specialists Bruce McCandless, Ronald McNair and Robert Stewart. This is the first shuttle flight to end on the runway at Kennedy Space Center, eliminating the need for a costly, time-consuming 747 ferry flight to retrieve the shuttle from Edwards Air Force Base.