NASA Delays Artemis II Moon Mission After New Rocket Issue

The highly anticipated flight is pushed back to at least April due to a problem with the rocket's helium system.

Feb. 21, 2026 at 10:48pm

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NASA has delayed the Artemis II lunar mission, the first crewed flight to the moon in over 50 years, after a new issue arose with the rocket's helium system during pre-launch testing. The space agency said it will need to roll the massive Space Launch System rocket back to the Vehicle Assembly Building to address the problem, ruling out a previously targeted March launch date. Artemis II is now targeting a liftoff in April at the earliest.

Why it matters

The Artemis program is NASA's ambitious effort to return astronauts to the lunar surface, with the ultimate goal of establishing a sustainable human presence on the moon. This latest delay is a setback in that process, as the agency works to overcome technical challenges and get the new moon rocket system operational.

The details

During routine pre-launch testing on Saturday, NASA discovered an issue with the flow of helium to the rocket's upper stage, which is essential for purging the engines and pressurizing the fuel tanks. The space agency said the only way to access and fix the problem is to roll the 322-foot-tall rocket back to the hangar, ruling out a March liftoff. This helium issue is separate from the hydrogen fuel leaks that had previously delayed the mission by a month.

  • On February 21, 2026, NASA revealed the latest problem with the rocket's helium system.
  • The Artemis II mission was previously targeting a March 6, 2026 launch date.

The players

Jared Isaacman

NASA Administrator.

Cheryl Warner

NASA spokesperson.

Space Launch System (SLS) rocket

The massive rocket that will launch the Artemis II mission to the moon.

Orion crew capsule

The spacecraft that will carry the astronauts to the moon.

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What they’re saying

“We will begin preparations for rollback, and this will take the March launch window out of consideration.”

— Jared Isaacman, NASA Administrator

“I understand people are disappointed by this development. That disappointment is felt most by the team at NASA, who have been working tirelessly to prepare for this great endeavor.”

— Jared Isaacman, NASA Administrator

What’s next

NASA's next opportunities for the Artemis II launch would be at the beginning or end of April 2026.

The takeaway

This latest delay in the Artemis II mission highlights the technical challenges NASA continues to face in getting its new moon rocket system operational. While disappointing, the agency is working to resolve the issues and maintain progress towards the goal of returning astronauts to the lunar surface in the coming years.