NASA has postponed a planned International Space Station (ISS) spacewalk after a medical concern involving one member of the four-person Crew-11 team emerged Wednesday afternoon aboard the orbital complex. The agency confirmed the unnamed astronaut is stable but said the issue was serious enough to cancel the six-and-a-half-hour spacewalk that NASA astronauts Mike Fincke and Zena Cardman were scheduled to conduct to prepare the station for a future solar array installation. NASA has also acknowledged that ending Crew-11’s mission earlier than planned is now being actively considered. “Safely conducting our missions is our highest priority, and we are actively evaluating all options, including the possibility of an earlier end to Crew-11’s mission,” the agency said, while stressing that medical privacy rules prevent it from sharing further details. Crew-11, which launched to the ISS in August 2025 aboard a SpaceX Crew Dragon, includes NASA astronauts Zena Cardman and Mike Fincke, JAXA astronaut Kimiya Yui, and Russian cosmonaut Oleg Platonov.