After Monday's scrubbed lift-off bid, the Space Launch System rocket is about to give it another go.
The 100m-tall vehicle's objective will be to hurl a human-rated capsule in the direction of the Moon, something that hasn't happened since Project Apollo ended in 1972.
The shuttle-era power units are chilled during countdown to -240C to prevent them being shocked by the sudden injection of cryogenic propellants at the moment of launch. But a sensor was indicating that Engine No 3 might be 15-30 degrees short of where its temperature needed to be. The former astronaut now works for Northrop Grumman who make the big white solid boosters on the sides of the SLS.
So, the upper-stage will have to raise and circularise the orbit before then boosting Orion in the direction of the Moon.
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