The tenth mission for Challenger, STS-51-L was scheduled to deploy the second in a series of Tracking and Data Relay Satellites, carry out the first flight of the Shuttle-Pointed Tool for Astronomy (SPARTAN-203) / Halley's Comet Experiment Deployable in order to observe Halley's Comet, and carry out several lessons from space as part of the Teacher in Space Project and Shuttle Student Involvement Program (SSIP).
Low Earth OrbitSTS-61-C was the twenty-fourth mission of the shuttle program and the seventh of the Space Shuttle Columbia. The mission included the second African-American shuttle pilot, future NASA Administrator Charles Bolden, the first Costa Rican born astronaut and the second sitting politican to fly in space: Bill Nelson.
Low Earth Orbit