The Space Launch System vehicle rolls out for a practice countdown ahead of a flight this summer.
The SLS came out of the VAB just before 18:00 local Florida time.
The Crawler Transporter goes very slowly, with a cruising speed of just over 1km/h , so it will take many hours to reach the pad, especially as engineers plan to stop and start the tractor to check everything is as it should be. This will see the rocket loaded with propellants and taken through a practice countdown all the way to a mere 9.4 seconds before the moment of lift-off. The "scrub" point is just before they would normally light the four big shuttle-era engines under the rocket.
While Nasa is developing the SLS, the American rocket entrepreneur Elon Musk is preparing an even larger vehicle at his R&D facility in Texas.
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