This week in 1974, after a successful 84-day mission, the third crewed Skylab mission crew returned to Earth. In this image, a crew member performs extravehicular activity outside the orbiting lab. NASA’s Marshall Space Flight Center provided the Saturn launch vehicles for the four Skylab missions and directed many of the space station’s experiments. Today Marshall’s Payload Operations Integration Center serves as “science central” for the International Space Station, working 24/7, 365 days a year in support of the orbiting laboratory’s scientific experiments. 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)