The trip began hours earlier when NASA's crawler-transporter 2 set off on a 4-mile journey carrying the fully stacked SLS rocket and Orion spacecraft. Traveling at a top speed of just 0.82 mph, the crawler moved the massive Moon rocket steadily toward the launch pad.

After exiting the VAB's high-bay doors, the rollout briefly paused so teams could adjust the crew access arm, a structure that allows astronauts and closeout crews to enter Orion on launch day.

Preparing for Critical Prelaunch Testing

Over the next several days, engineers and technicians will focus on readying Artemis II for a wet dress rehearsal. This test simulates key launch-day activities, including fueling the rocket and running through countdown procedures. The rehearsal is currently targeted for no later than Feb. 2.

During the test, teams will load the rocket with cryogenic, or super-cold, propellants, carry out a full countdown sequence, and then safely drain the propellants. These steps are essential preparations ahead of NASA's first crewed Artemis mission.

Possible Additional Testing Before Launch

NASA may conduct more than one wet dress rehearsal to ensure the rocket and spacecraft are fully prepared for flight. If additional work is needed, the agency could roll SLS and Orion back to the Vehicle Assembly Building after the rehearsal for further inspections or adjustments.

Astronaut Crew and Mission Goals

The Artemis II test flight will carry NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with CSA (Canadian Space Agency) astronaut Jeremy Hansen. The crew will spend about 10 days traveling around the Moon before returning to Earth.

This mission marks another major step toward future U.S.-crewed landings on the Moon's surface. Those efforts aim to establish a long-term human presence on the Moon and help NASA prepare to send the first astronauts -- Americans -- to Mars.