The four astronauts who are due to fly around the moon in NASA's historic Artemis 2 lunar mission are back in isolation ahead of a potential April launch.

Nasa's giant Moon rocket has returned to its launch pad for a second time, ahead of a mission to send astronauts around the Moon – something not attempted in more than 50 years.

Teams worked for hours beginning early morning Friday, March 20, to slowly roll the towering Space Launch System rocket across a 4-mile span of the Kennedy Space Center.