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NASA began the two-day launch countdown for the Artemis 1 lunar test flight at 10:23 a.m. EDT (1423 GMT) Saturday. Liftoff of the Space Launch System moon rocket remains set for Monday during a two-hour window opening at 8:33 a.m. EDT (1233 GMT).

NASA’s first Space Launch System moon rocket arrived on pad 39B early Aug. 17 after an overnight rollout from the Vehicle Assembly Building at the Kennedy Space Center in Florida.

Three instrumented mannequins strapped into seats on NASA’s Orion spacecraft awaiting liftoff on the first flight of the huge Space Launch System rocket will help engineers evaluate the human experience for future astronauts trips to the moon.

NASA’s towering 322-foot-tall Space Launch System moon rocket and Orion spacecraft arrived at their seaside launch complex early Wednesday after an overnight rollout from an assembly building at the Kennedy Space Center, moving a step closer to liftoff no earlier than Aug. 29 on an unpiloted test flight around the moon.