The 322-foot (98-meter) rocket began the slow 4-mile (6.4-kilometer) trek in the middle of the night, transported atop a massive crawler used since the 1960s Apollo era. The trip was held up for several hours by high wind but completed by midday, 11 hours after it began.
The three Americans and one Canadian will zip around the moon in their capsule and then come straight home without stopping. Their mission should have been completed by now, but hydrogen fuel leaks and clogged helium lines forced two months of delay.
While technicians plugged the leaks at the pad, the helium issue could only be fixed in the Vehicle Assembly Building, forcing NASA to roll the rocket back at the end of February.
The last time NASA sent astronauts to the moon was during Apollo 17 in 1972. The new Artemis program aims for a two-person landing in 2028.
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