CAPE CANAVERAL, USA: NASA’s giant new moon rocket headed to the launch pad Saturday in preparation for astronauts’ first lunar fly-around in more than half a century.

The out-and-back trip could blast off as early as February.

The 322-foot (98-meter) rocket began its 1 mph (1.6 kph) creep from Kennedy Space Center’s Vehicle Assembly Building at daybreak. The four-mile (six-kilometer) trek could take until nightfall.

Thousands of space center workers and their families gathered in the predawn chill to witness the long-awaited event, delayed for years. They huddled together ahead of the Space Launch System rocket’s exit from the building, built in the 1960s to accommodate the Saturn V rockets that sent 24 astronauts to the moon during the Apollo program. The cheering crowd was led by NASA’s new administrator Jared Isaacman and all four astronauts assigned to the mission.

Weighing in at 11 million pounds (5 million kilograms), the Space Launch System rocket and Orion crew capsule on top made the move aboard a massive transporter that was used during the Apollo and shuttle eras. It was upgraded for the SLS rocket’s extra heft.