NASA explains the reason for canceling its first spacewalk in eight months.

      It's the first of two scheduled spacewalks for this month.

      NASA astronaut Zena Cardman, donned in her pressurized spacesuit, is verifying its communication and power systems in preparation for her initial spacewalk.

      NASA has been preparing for two spacewalks at the International Space Station (ISS) over the past few weeks, marking its first such activity in eight months.

      However, just hours before astronauts Mike Fincke and Zena Cardman were slated to start their first walk on Thursday, NASA announced the postponement of the event due to a “medical concern with a crew member that arose Wednesday afternoon aboard the orbital complex.”

      The U.S. space agency did not disclose further details regarding the postponement, including which astronaut was involved.

      “Due to medical privacy, it is not proper for NASA to share more information about the crew member,” the agency stated, adding that “the situation is stable,” and that further updates, including a new date for the spacewalk, would be shared later.

      Fincke and Cardman were set to initiate their spacewalk at 8 a.m. ET on Thursday. When it eventually occurs, it will mark Fincke's 10th spacewalk throughout his extensive career and Cardman’s first, having arrived in orbit for the first time in August 2025.

      During their upcoming spacewalk, their primary task will be to install a modification kit and route cables for a future solar array. Additional tasks will include installing jumper cables, photographing hardware, and collecting microorganism samples.

      It is unclear whether the postponement will impact the schedule for the second spacewalk, currently planned for January 15. NASA has not yet confirmed the names of the two astronauts participating in the second spacewalk.

      Whenever the spacewalks are held, NASA will livestream both events on NASA+, Amazon Prime, and the agency’s YouTube channel. The live streams will closely follow the astronauts as they work outside the space station approximately 250 miles above Earth. Viewers can also listen to the astronauts’ communications with Mission Control at NASA’s Johnson Space Center in Houston, Texas, while a NASA official will provide live commentary to explain ongoing activities.

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