The spacewalk was postponed due to a "spacesuit discomfort issue," the International Space Station said in a post on X. A rescheduled time or date for the spacewalk has not yet been announced.

The 90th spacewalk for the U.S. is planned to have astronauts Tracy C. Dyson and Matt Dominick exit the ISS' Quest airlock to perform a number of tasks, including removing a faulty electronics box from a communications antenna on the starboard side of the station. According to NASA, the astronauts had also planned to collect samples for "analysis to understand the ability of microorganisms to survive and reproduce on the exterior of the orbiting laboratory."

After the spacewalk is rescheduled and completed, NASA will announce the astronauts who will participate in the 91st and 92nd U.S. spacewalks, scheduled for June 24 and July 2.

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How to watch the NASA spacewalk outside the ISS

NASA will stream the spacewalk once an updated date and time are announced. You can watch it on NASA+, NASA Television, the NASA app, YouTube, and the agency’s website. 

Who are the NASA astronauts on the spacewalk?

NASA astronauts Dyson and Dominick will complete U.S. Spacewalk 90. The spacewalk was postponed Thursday morning due to a "spacesuit discomfort issue," and a rescheduled time and date have not yet been announced.

This will be the fourth spacewalk for Dyson, who will wear a suit with red stripes, and the first for Dominick, who will wear an unmarked suit.

Dyson has been on the ISS since March 2024, her third trip to space. Dominick has also been at the ISS since March, and is the commander of the SpaceX Crew-8 mission on the ISS.

Boeing Starliner astronauts staying at ISS to help spacewalk

The two astronauts from Boeing's Starliner spacecraft, which successfully launched and docked at the International Space Station last week, extended their stay at the space station to assist with the spacewalk, NASA said.

Suni Williams and Butch Wilmore planned to stay at the ISS for a just a week but are now scheduled to return to Earth no earlier than Tuesday, June 18.