NASA will return four astronauts to Earth early from the International Space Station due to a medical concern with one of the Crew-11 astronauts.

NASA has postponed a planned International Space Station spacewalk after a medical issue affected one astronaut, raising fresh questions about upcoming station operations and the Crew 11 mission timel...

Returning the four-person crew early could delay some experiments and maintenance tasks until the new crew arrive next month, according to Dr Simeon Barber, a space scientist at the Open University.