This week in 2017, astronauts Peggy Whitson and Jack Fisher completed the 200th spacewalk on the International Space Station. During the four-hour spacewalk, the astronauts replaced a large avionics box that supplies electricity and data connections to science experiments. They also completed additional tasks to install a connector that would route data to the Alpha Magnetic Spectrometer, repaired insulation at the connecting point of the Japanese robotic arm and installed a protective shield on the Pressurized Mating Adapter-3, which hosted a new international docking port for the arrival of commercial crew. The first space station walk was conducted by astronauts Jerry Ross and Jim Newman during space shuttle Endeavour’s STS-88 mission on Dec. 7, 1998. Today, the Payload Operations Integration Center at NASA’s Marshall Space Flight Center serves as “science central” for the space station, working 24/7, 365 days a year in support of the orbiting laboratory’s science experiments. After 20 years of continuous human presence, the space station remains the sole space-based proving ground and stepping stone toward achieving the goals of the Artemis program. 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)