SpaceX and NASA have come together to launch astronauts into space tonight - which will be the first time from US soil in nine years.
But it will be their second attempt of the manned mission, named Demo-2, after Wednesday's launch was aborted due to stormy weather conditions.
Rocket Falcon 9 which is carrying the Crew Dragon capsule with experienced NASA astronauts Robert Behnken, 48, and Douglas Hurley, 53, is to blast off from launchpad 39A at the Kennedy Space Centre in Florida - subject to weather conditions.
And you can join in with the excitement by watching the build-up to the launch and the lift-off live on Nasa's live stream above.
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