The Space Launch System rocket is fueled, the crew is named, and the countdown is almost real. NASA completed a full wet dress rehearsal for the Artemis II mission today, February 19, loading more than 750,000 gallons of supercold propellant into the 322-foot rocket at Kennedy Space Center — the final major milestone before the first crewed lunar mission in more than half a century.
With the dress rehearsal wrapping, NASA has identified a launch window spanning March 6 through 9, with an additional opportunity on March 11. The agency will not formally set a launch date until engineers complete post-rehearsal data reviews, but if those reviews clear, the four-person crew is expected to enter medical quarantine in Houston as early as Friday.
That crew — Commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen — will ride the Orion capsule on a free-return trajectory around the far side of the Moon, the deepest any humans will have traveled into space since the final Apollo landing in December 1972.
Engineering Safety, Made Visible
Today's rehearsal was itself a vindication of methodical engineering. An earlier wet dress rehearsal on February 2 had to be cut short after hydrogen leaks were detected — a reminder that rocket science tolerates no shortcuts. Teams traced the problem to two failing seals on fueling lines and a clogged filter in the ground support equipment that was restricting liquid hydrogen flow into the booster. Both were replaced before the second attempt.
The fix worked. NBC News confirmed that fueling proceeded nominally Thursday morning, with 196,000 gallons of liquid oxygen and 537,000 gallons of liquid hydrogen flowing into the first stage, plus an additional 22,500 gallons into the upper stage. Loading began at 9:35 a.m. EST after Launch Director authorized the propellant operations.
