NASA has pushed back the launch of its Artemis 1 mission to the moon due to an issue with one of the engines of the giant SLS rocket.

With 40 minutes left on the countdown clock at the Kennedy Space Center in Florida, Mission Control announced an unplanned hold as technicians investigated a problem that had arisen while loading the SLS rocket’s core stage with more than 700,000 gallons of liquid hydrogen and liquid oxygen, supercooled to a frigid –423 and –297 degrees Fahrenheit. The problem was with the third RS-25 engine, one of the engines next to the right solid rocket booster. The flow of liquid hydrogen into the engine’s compartment wasn’t working as it should, and the propellant wasn’t at the proper temperature range.

Engineers had included the issue on their checklist during the most re
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