NASA Completes Second Fueling Test for Artemis II Moon Mission

Persistent Hydrogen Leaks Remain a Challenge as Agency Prepares for Crewed Lunar Flyby

Published on Feb. 27, 2026

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NASA has successfully completed a second fueling test of its massive Space Launch System (SLS) rocket as it pushes forward with preparations for the Artemis II mission, the first crewed flight to orbit the Moon in over 50 years. However, the test highlighted ongoing issues with hydrogen fuel leaks, a recurring problem that has plagued the program. The mission, targeted for launch no earlier than March 6, 2026, will send four astronauts on a 10-day journey around the lunar surface.

Why it matters

The Artemis II mission represents a critical step in NASA's long-term plans for lunar exploration, paving the way for future surface landings. Overcoming the technical challenges with the SLS rocket, particularly the hydrogen fuel leaks, is essential for the program's success and the agency's ability to safely send astronauts back to the Moon.

The details

During the latest fueling demonstration, NASA successfully pumped over 700,000 gallons of supercold liquid hydrogen and liquid oxygen into the SLS rocket. The test reached the half-minute mark without significant leaks, a positive sign. However, NASA has struggled with hydrogen fuel leaks since the Space Shuttle program, and previous Artemis tests, including the uncrewed Artemis I flight in 2022, have been delayed due to similar issues. Engineers have recently replaced seals and a filter in an attempt to resolve the problem, but the nature of the extremely cold hydrogen fuel makes it prone to escaping through even the smallest gaps.

  • The latest fueling test was completed late Thursday night.
  • The Artemis II mission is currently targeted for launch no earlier than March 6, 2026.

The players

Jared Isaacman

NASA's new administrator, who is taking a proactive approach to addressing the challenges facing the Artemis program, including plans to redesign the fuel connections between the rocket and pad before the Artemis III launch.

Reid Wiseman

The mission commander for the Artemis II crew, which also includes Victor Glover, Christina Koch, and Jeremy Hansen.

Space Launch System (SLS)

NASA's new heavy-lift launch vehicle that will carry the Orion spacecraft, developed to carry astronauts to the Moon and beyond.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident (San Francisco Chronicle)

What’s next

The judge in the case will decide on Tuesday whether or not to allow Walker Reed Quinn out on bail.

The takeaway

This case highlights growing concerns in the community about repeat offenders released on bail, raising questions about bail reform, public safety on SF streets, and if any special laws to govern autonomous vehicles in residential and commercial areas.