By Jackie Wattles, CNN
Photo: Supplied / NASA via Paihau-Robinson Space Team
NASA said it was postponing a spacewalk that was scheduled, citing a "medical concern" with one of the crew members.
The space agency did not provide additional information about the issue or name the astronaut involved.
"Due to medical privacy, it is not appropriate for NASA to share more details about the crew member," the space agency said in a statement. "The situation is stable.
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