Crew-10, a joint Nasa-SpaceX mission, was due to be launched on Wednesday 12 February on a Falcon 9 rocket from the Kennedy Space Centre in the US state of Florida.

The rocket will fly four new crew members to the ISS – and then make it possible for Williams and Wilmore to return back to Earth in the next few days.

However, the launch of the spacecraft was cancelled less than an hour before lift off due to a problem with one of the clamp arms that holds the rocket in place.

There were worries that it would not have been able to open fully during take off.

Nasa say that engineers were trying to fix the problem and that they hope to try to launch the rocket again on Thursday.