NASA is already walking back its Friday announcement that it will try to launch to the moon in March, after discovering a new problem with the Artemis II rocket. Officials said they're eyeing Tuesday, Feb. 24, to haul the rocket off the launchpad. During a routine step to restore pressure in the Space Launch System , the team couldn't get helium to flow properly through the rocket. Helium, though not a fuel, is important because it helps protect the engines and keeps the fuel tanks at the right pressure. Though the helium system worked fine during a launch rehearsal that ended Thursday night, engineers are especially troubled knowing a similar pattern cropped up before the Artemis I launch in 2022, which didn't carry astronauts. The affected part is the rocket's upper stage, which uses super-cold fuels — liquid hydrogen and liquid oxygen — to power the mission once it’s in space . Engineers are looking at several possible causes, including a connection point...
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