The US space agency's big new rocket and capsule system can proceed with Monday's planned lift-off.
The launch will be a key moment for Nasa, which, in December, will celebrate the 50th anniversary of the very last human landing on the Moon - Apollo 17.
"You know, right now more than half the world's population has never seen anybody walk on another world, so in many ways it is going to be their first moon walk," said Keith Cowing, the editor of the Nasa Watch website which covers Nasa news. Orion has actually flown before, once, on a near-Earth test outing in 2014. But that used an existing commercial rocket to get into space. This upcoming flight is therefore the first full end-to-end examination of the Artemis exploration hardware.SLS and Orion were rolled out to the launch pad last week. Engineering and technical staff have spent the intervening days attaching fuel, electrical and communication lines in readiness for the big countdown.
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