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 Space Launch System (SLS), the world's most powerful rocket, has officially rolled out to the launch pad for the Artemis II mission.

The mission will have four astronauts, three Americans and one Canadian on a approximate 10-day orbit around the Moon before returning to Earth.