Workers prepare to tow Space Shuttle orbiter Atlantis from the OPF to the VAB. The move will allow work to be performed in the OPF that can only be accomplished while the bay is empty. Atlantis will remain in the VAB for about 10 days, then return to the OPF as work resumes to prepare it for launch in Sept 2004 on the first return-to-flight mission, STS-114. 12/05/2003. Credit: NASA

Almost 50 years later, NASA is ready to return humans to the lunar surface -- and it begins with the Artemis I mission. Here are the big numbers that make the mission a monumental feat.

Aeronautical Engineering

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