This week in 1984, space shuttle Challenger completed STS-41B, a seven-day mission that concluded with the first shuttle landing at NASA’s Kennedy Space Center. The mission launched the Westar-VI and Palapa-B2 communications satellites and featured the first untethered spacewalks, performed by astronauts Bruce McCandless and Robert Stewart using the Manned Maneuvering Unit. The NASA History Program is responsible for generating, disseminating, and preserving NASA’s remarkable history and providing a comprehensive understanding of the institutional, cultural, social, political, economic, technological, and scientific aspects of NASA’s activities in aeronautics and space. For more pictures like this one and to connect to NASA’s history, visit the Marshall History Program’s webpage. (NASA)