They spent nearly eight months in orbit, longer than expected because of all the trouble with Boeing’s Starliner crew capsule and rough weather, including Hurricane Milton.
One of the Americans ended up spending the night there for an undisclosed “medical issue.” NASA declined to say who was hospitalised or why, citing medical privacy.
When asked at Friday’s news conference which one had been sick, the astronauts refused to comment.
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“Spaceflight is still something we don’t fully understand. We’re finding things that we don’t expect sometimes. This was one of those times and we’re still piecing things together on this,” Barratt said.
Barratt, a doctor who specialises in space medicine, was the only member of the crew who had flown in space before.
The two astronauts who served as test pilots for Boeing’s Starliner — Butch Wilmore and Suni Williams — will remain at the space station until February, flying back with SpaceX.
Starliner returned empty in September.