Boeing and SpaceX were both awarded billion-dollar contracts by Nasa to provide commercial space flights for its astronauts. Boeing’s was worth $4.2bn (£3.18bn) while SpaceX got $2.6bn.
While SpaceX has already flown several crewed missions to the ISS, this was the first test flight for Boeing’s Starliner with astronauts on board.
Since encountering the spacecraft’s issues, engineers at Boeing and Nasa have spent months trying to understand these technical issues.
They have been carrying out tests and gathering data, both in space and back on the Earth. Their hope was to pin down the root of the problems and find a way to return the astronauts home safely on Starliner.
The decision has been made to extend their stay on the ISS until February 2025 so they can return on a SpaceX Crew Dragon spacecraft.
The extra time allows SpaceX to launch its next vehicle, with lift off scheduled for the end of September.
It was supposed to have four astronauts on board, but will instead travel to the space station with two. This leaves room for Butch and Suni to join them in the vehicle to return to Earth at the end of its planned mission next February.
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