NASA rolls Artemis II off the pad after new engine problem

Rocket heads back for repairs

NASA started rolling the Artemis II rocket off Launch Pad 39B at Kennedy Space Center around 9 a.m. EST on Wednesday.

The massive rocket and its Orion spacecraft are heading back to the Vehicle Assembly Building about four miles away, a slow trip that takes up to 12 hours.

The rollback was supposed to happen on Tuesday, but got pushed a day because of cold temperatures and high winds along Florida’s Space Coast.

Once inside the building, teams plan to set up platforms right away to reach the problem area.

Helium flow stopped in the upper stage

Overnight on Feb. 21, engineers noticed that helium flow to the rocket’s upper stage had cut out.

That upper stage, called the interim cryogenic propulsion stage, needs helium to pressurize its fuel tanks and keep the engine running the way it should.

The tricky part is that everything worked fine during both practice countdowns, including the successful one on Feb. 19. The problem only showed up during routine work after that rehearsal ended.

Any break in helium flow is a serious safety issue that NASA has to fix before astronauts can fly.

Engineers narrowed it to three suspects

NASA has not pinpointed the exact cause yet, but engineers are looking at three possibilities. The first is the connection point where ground equipment hooks into the rocket’s helium lines.

The second is a valve inside the upper stage itself. The third is a filter that sits between the ground equipment and the rocket.

None of these areas can be properly reached or fixed while the rocket sits on the launch pad, which is why NASA had to bring it back inside.

March launch dates are off the table

NASA Administrator Jared Isaacman confirmed the rollback kills any chance of launching in March. The agency had five dates lined up: March 6, 7, 8, 9, and 11.

Those windows depend on where the Earth and Moon are positioned relative to each other, since the mission’s flight path needs a precise alignment.

With the rocket now heading back to the building for repairs, none of those dates are possible anymore.

April could still work if repairs go quickly

NASA says moving fast on the rollback could keep the April launch window alive. Six dates are open in April: the 1st, 3rd, 4th, 5th, 6th, and 30th.

Whether the agency can hit any of them depends on how repairs go, what the data shows, and how the rest of the schedule falls into place.

NASA has not set an official launch date and has stressed it will only pick one after every issue is fully resolved.

This is the third delay in under a month

Artemis II has been a long time coming. NASA originally aimed for late 2024, but heat shield inspections and hardware reviews after the Artemis I flight pushed the timeline back.

The mission slipped through 2025 and into early 2026, with a February launch window. Then a liquid hydrogen leak during a practice countdown on Feb. 2 bumped the launch to March.

Now the helium problem, a completely separate issue, has pushed things back again. That makes three delays in less than a month.

Artemis I hit similar helium snags

NASA is looking back at data from the uncrewed Artemis I mission, which launched in November 2022. Before that flight, engineers also had to work through helium pressurization problems with the same upper stage system.

Artemis I dealt with hydrogen leaks during pre-launch testing, too, a problem that has now shown up again with Artemis II. The pattern gives engineers useful data, but it also shows that these issues keep coming back.

The crew left quarantine and waits in Houston

The four-person crew entered quarantine on Feb. 20, just one day before engineers found the helium problem. NASA released them the evening of Feb. 21, and they remain in Houston.

They will go back into quarantine about two weeks before whatever launch date NASA eventually sets. Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch are all NASA astronauts.

Mission Specialist Jeremy Hansen flies for the Canadian Space Agency.

The crew will make history on multiple fronts

This crew carries a lot of firsts. Victor Glover will become the first person of color to travel to the moon.

Christina Koch will become the first woman to make the trip. Jeremy Hansen will become the first Canadian.

Koch already set the record for the longest single spaceflight by a woman at 328 days on the International Space Station.

Hansen, a former fighter pilot in the Canadian Armed Forces, will be making his first trip to space.

The mission loops around the far side of the moon

The roughly 10-day mission will send the four astronauts on a path that swings around the far side of the moon and back to Earth. At their farthest point, the crew will travel about 6,400 miles beyond the moon.

The flight uses what is called a free-return trajectory, meaning Earth’s gravity naturally pulls the spacecraft home after it passes the moon.

The crew will test Orion’s systems in the deep space environment. Splashdown is planned in the Pacific Ocean off San Diego.

No one has gone this far since 1972

Artemis II will be the first crewed mission beyond low Earth orbit since Apollo 17 in December 1972, more than 53 years ago.

It is also the first crewed flight of both the Space Launch System rocket and the Orion spacecraft. A successful mission clears the way for Artemis III, which aims to land astronauts near the moon’s south pole.

NASA has targeted Artemis III for 2027.

NASA plans a briefing in the coming days

NASA said it will hold a media briefing soon to discuss the rollback and next steps. Once the rocket is inside the Vehicle Assembly Building, teams will start inspections and repairs right away.

Nobody knows yet how long the work will take. After repairs, the rocket would need another rollout to the launch pad, a trip that itself takes about 12 hours.

NASA has made clear that crew safety comes first and it will not rush toward a launch date.

This article was created with AI assistance and human editing.

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