sentences:  On March 12, 1987, the mission was rescheduled for launch in 1992, in lieu of other backlogged missions (Galileo, Magellan, Ulysses) after the Space Shuttle "Challenger" disaster.Along with a launch delay, budget overruns necessitated the elimination of two instruments to meet the 1992 planned launch.As the development matured, the primary science objectives were finalized as