NASA has announced the two astronauts stranded on the International Space Station (ISS) will return to Earth on SpaceX in February 2025.
Pilot Sunita “Suni” Williams and Commander Barry “Butch” Wilmore blasted off in Boeing’s new spacecraft on 5 June, and were meant to stay in orbit for eight days after docking on the ISS.
However, problems with the Starliner’s propulsion system mean the NASA astronauts’ return to Earth has been repeatedly delayed. They’ve now been there for more than two months.
NASA administrator Bill Nelson said at a press conference on Saturday a manned flight would be too dangerous.
“Spaceflight is risky,” he said. “Even at its safest, and even at its most routine. A test flight by nature is neither safe nor routine.”
Associate administrator Jim Free then added: “The uncertainty in our [technological] margins is what drove our decision.”
Starliner will now return to Earth unmanned, while the two astronauts are set to return in February on a
SpaceX Crew Dragon spacecraft which is due to launch next month as part of a routine astronaut rotation mission.
Ms Williams and Mr Wilmore both support the plan “fully,” and the SpaceX crew will make the necessary adjustments.
Many of Starliner’s thrusters in the propulsion system overheated when fired and leaks of helium, used to pressurise the thrusters, appear to be connected to how frequently they are used, NASA’s commercial crew manager Steve Stich previously explained.
Speaking at the press conference on Saturday, Mr Stitch explained: “The bottom line relative to bringing Starliner back is there was just too much uncertainty in the prediction of the thrusters.
“If we had a model – if we had a way to accurately predict what the thrusters would do for the undock and all the way through the deorbit burn and through the separation sequence, I think we would have taken a different course of action.
“But when we looked at the data and looked at the potential for thruster failures with a crew on board, and then getting into this very tight sequence of finishing the deorbit burn, which puts the vehicle on an entry, and then immediately manoeuvring from that into a step sequence to separate the service module and crew module, it was just too much risk for the crew.“
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