NASA's SLS Rocket Returns to Launch Pad for Artemis II Mission in April

NASA's Space Launch System (SLS) rocket, dubbed the 'Moon rocket,' successfully completed its rollout and returned to Launch Pad 39B at the Kennedy Space Center on March 20. The 322-foot-tall rocket, positioned atop the 400-foot Mobile Launcher 1 (ML-1), commenced its deliberate journey from the Vehicle Assembly Building (VAB) on Thursday evening, following repairs.

This critical move to Pad 39B paves the way for the Artemis II mission's launch attempt, projected for early April. The crawler-transporter, carrying the immense launch platform, began its slow journey around 12:20 a.m. EDT (0420 UTC), later than the anticipated 8:00 p.m. EDT (0000 UTC) start, due to strong winds at the Kennedy Space Center.

The approximately 12-hour journey culminated in the rocket and ML-1 being secured onto the pad pedestals at 11:21 a.m. EDT (1521 UTC) on Friday, a process NASA refers to as 'hard down.'

The SLS rocket and its Orion spacecraft had previously been rolled back into the VAB following the discovery of a helium flow issue in the rocket's upper stage on February 21. This issue, identified after a successful fueling test at Pad 39B, prompted NASA to reschedule the launch from March to April.

During its time in the VAB, alongside resolving the helium problem, technicians performed other essential pre-launch tasks. These included replacing batteries for the flight termination systems across the solid rocket boosters, core stage, and upper stage.

The Artemis II mission is poised to send four astronauts – NASA's Reid Wiseman, Victor Glover, and Christina Koch, joined by Canadian Space Agency (CSA) astronaut Jeremy Hansen – on a roughly 10-day journey around the Moon, culminating in a splashdown in the Pacific Ocean.

This mission marks the inaugural occasion for a crew to live and operate onboard the Orion spacecraft. Serving as a crucial test flight, it precedes future crewed missions within the Artemis program, aiming to return astronauts to the lunar surface, beginning with Artemis IV in 2028.

Recent announcements from NASA Administrator Jared Isaacman indicate shifts in the Artemis program's timeline. Notably, the first crewed lunar landing has been deferred from Artemis III to Artemis IV. The Artemis III mission is now planned to demonstrate Orion's docking capabilities in Earth orbit with either SpaceX's Starship lunar lander or Blue Origin's Blue Moon Mk.2, or potentially both.

In a March 12 interview, Isaacman stated that more specifics regarding the Artemis III mission would be revealed to the public within the next 60 to 90 days.

Isaacman also hinted at an upcoming gathering in Washington D.C. to discuss these program adjustments with industry and international partners. European Space Agency (ESA) Director General Josef Aschbacher commented on this anticipated event during a press briefing, expressing his eagerness to learn more about the changes.

Aschbacher remarked, "We look forward to the meeting next week. We will learn from NASA what the administration is planning for the Artemis architecture, including the Gateway and various other aspects." He added, "While I cannot preempt the discussion, it is crucial that we have had intense and productive discussions among ESA member states, who have given their full support for me to coordinate activities. NASA will encounter a very united Europe in Washington."