NASA plans to roll its huge moon rocket back to the launchpad at Florida’s Kennedy Space Center on Thursday evening, setting the stage for four astronauts’ much-anticipated journey around the moon. The 322-foot-tall Space Launch System rocket, topped with the Orion capsule, will launch the crew on a 10-day trip as early as April 1 . But first, the rocket and spacecraft must make a painstakingly slow, 4-mile trek from the hangar to the launchpad. The journey is set to begin at 8 p.m. ET and will