The two American astronauts who have been stranded in space for nine months will experience “physical adaptation” when they return to Earth, former NASA astronaut and retired U.S. Navy Capt. Winston Scott told Newsmax on Thursday.

SpaceX on Wednesday scrubbed the expected launch of a replacement crew of four astronauts to the International Space Station that would have set in motion the long-awaited homecoming of U.S. astronauts Butch Wilmore and Suni Williams, who have been stuck in space after a trip on Boeing’s faulty Starliner.

NASA said it’s now targeting a launch no earlier than Friday night.

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