Pakistan, March 20 -- NASA has begun rolling its massive Space Launch System (SLS) rocket and Orion spacecraft back to the launch pad in Florida, marking a key step toward its planned crewed mission around the Moon.

The operation started Thursday evening at the Kennedy Space Center, where engineers initiated the slow transfer of the fully assembled rocket from the Vehicle Assembly Building to Launch Pad 39B. The journey, covering about four miles, can take up to 12 hours due to the size and complexity of the system.

The rollout comes after NASA completed repairs related to technical issues, including a problem with helium flow that forced the agency to delay an earlier launch attempt. Engineers had also previously encountered a liquid h...