"A wet dress rehearsal is a designated time before launch when engineers and crew conduct testing of the spacecraft. During this final test, the Orion spacecraft that will house the astronauts and the Space Launch System (SLS) rocket will be checked over the course of a detailed countdown schedule. A countdown clock began at 8:13 p.m. ET on Saturday, counting down to the simulated liftoff on Monday evening."
"On Monday, more than 700,000 gallons of fuel containing liquid oxygen and liquid hydrogen is scheduled to be loaded into the rocket. Launch teams will also practice removing the fuel from the rocket and will conduct a launch countdown. A simulated launch window will start at 9 p.m. ET and is expected to last until 1 a.m. The Orion spacecraft has been powered up for several days because of the cold weather and engineers are preparing to charge its flight batteries, NASA said on Sunday."
Preparations are underway to begin critical testing of the Artemis II spacecraft and SLS rocket with fuel testing set to begin Monday. Freezing temperatures at Kennedy Space Center delayed the wet dress rehearsal. The wet dress rehearsal will load more than 700,000 gallons of liquid oxygen and liquid hydrogen and include practicing fuel removal and a full launch countdown. A simulated launch window will run from 9 p.m. ET to 1 a.m. Orion has been powered up and engineers will charge flight batteries. Artemis II will send four astronauts on a 10-day trip around Earth and the moon.
Read at www.npr.org
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