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The astronauts had been travelling on a test flight that was meant to last eight days.

They were taking part in the first crewed test flight of the Starliner spacecraft, which was developed by aerospace company Boeing.

Shortly before dusk on Tuesday, the world's most powerful rocket blasted off on a test flight from its launch site in Texas.

"We've essentially lost our attitude control with Starship," a SpaceX commentator said over a live broadcast of the test flight.

Ultimately, though, Starship's ninth test flight became its third in a row to end in fiery failure.