NASA has rolled back the Artemis II SLS rocket and Orion spacecraft after engineers detected a helium flow issue in the upper stage during fueling tests. The problem affects fuel tank pressurization and engine performance, delaying the planned March launch as teams inspect and repair the rocket.​NASA has rolled back the Artemis II SLS rocket and Orion spacecraft after engineers detected a helium flow issue in the upper stage during fueling tests. The problem affects fuel tank pressurization and engine performance, delaying the planned March launch as teams inspect and repair the rocket.  ​ science