Nasa is in the process of rolling out the Artemis II rocket from its warehouse to the launchpad at the Kennedy Space Centre.
It is aiming for an early April launch for the first crewed mission around the Moon in more than 50 years.
The journey, which will last about 10 days, could take its astronauts further into space than anyone has been before.
The crew of four is made up of Nasa commander Reid Wiseman, pilot Victor Glover and mission specialist Christina Koch.
A second mission specialist, Jeremy Hansen of the Canadian Space Agency, will also be on board.
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