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[b]Tanking underway for Wet Dress Rehearsal[/b] Tanking has begun for the Artemis I Wet Dress Rehearsal with chilling down the liquid oxygen propellant lines for core stage. In sequential fashion, liquid oxygen and liquid hydrogen will flow into the Space Launch System's (SLS) core stage and interim cryogenic propulsion stage tanks and be topped off as some propellant boils off. Launch director Charlie Blackwell-Thompson gave the "go" to start propellant loading, which began at 9:28 a.m. EDT on Monday (June 20) at T-6 hours, 40 minutes. The core stage's liquid oxygen tank holds 196,000 gallons of the propellant, cooled to minus 297 degrees Fahrenheit. Teams will fill the tank slowly at first and then will begin filling it more quickly. The liquid hydrogen tank holds 537,000 gallons. Earlier this morning, the countdown entered an extended hold as an issue with a valve for the redundant gaseous nitrogen (GN2) line was repaired.
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