NASA moved a 322-foot-tall rocket out to the launchpad on Saturday, a key step as the agency prepares for a long-awaited mission to send four astronauts around the moon.

NASA’s Artemis II mission is one step closer to the Moon as the SLS rocket and Orion spacecraft roll out to Launch Pad 39B at Kennedy Space Center.

Wiseman, pilot Victor Glover and Christina Koch — longtime NASA astronauts with spaceflight experience — will be joined on the 10-day mission by Canadian astronaut Jeremy Hansen, a former fighter pilo...