A critical test-firing of NASA’s Space Launch System moon rocket in Mississippi ended just 67 seconds after it began Saturday, well short of a planned eight-minute burn that was supposed to clear the way for the space agency to finally ship the rocket’s core stage to the Kennedy Space Center in Florida for launch preparations. The SLS core stage, built by Boeing, lit its four Aerojet Rocketdyne RS-25 engines for the first time at 5:27 p.m. EST (4:27 p.m. CST; 2227 GMT) Saturday for a burn that was expected to last more than eight minutes, the culmination of a year-long...