The history-making STS-7 mission of the space shuttle Challenger, the seventh space shuttle mission, is the subject of this single stamp design. Challenger lifted off on June 18, 1983, with a payload of two commercial communications satellites. Mission specialist Dr. Sally K. Ride became the first American woman in space aboard STS-7, which ended its six-day mission by becoming the first shuttle vehicle to land on the three-mile-long runway at NASA's Kennedy Space Center in Florida.