The four astronauts preparing to end a five-decade gap in crewed lunar flights will have to wait until at least April before they can begin the Artemis II mission. During the SLS rocket’s second wet dress rehearsal last weekend, NASA discovered an issue with the flow of helium to the rocket’s upper stage. Engineers decided […] The post NASA’s moon rocket is about to leave the launchpad, but it ain’t going skyward appeared first on Digital Trends .