NASA’s Artemis II rocket is returning to the Vehicle Assembly Building at Kennedy Space Center this week for repairs to its helium system, the space agency announced Sunday, delaying the first crewed moon mission in more than half a century to April at the earliest. The 6.4-kilometer move from the launch pad to the hangar was scheduled for Tuesday, weather permitting. The helium system failure emerged after NASA had successfully sealed dangerous hydrogen leaks following a fueling test Thursday.
The repeated setbacks underscore the complexity of preparing the rocket for its crewed lunar mission, which will carry three American astronauts and one Canadian to orbit the moon and back—the first humans to make the journey since NASA’s Apollo program ended in 1972.
The Challenge of Rocket Repair
The helium system issue marked the latest complication in an increasingly delayed launch timeline. The helium supplies the pressurization needed for the upper stage engines and to purge the fuel systems before flight.
NASA said in a statement that the rocket must return to the Vehicle Assembly Building “to determine the cause of the problem and fix it.” The agency had originally targeted March 6, 2026, for the launch. A quick return to the hangar would help preserve an April launch attempt, though the timeline depends on how repairs progress. The space agency has only a few days each month available for launching the four-person crew around the moon and back.
The Crew Awaits
The four crew members assigned to the Artemis II mission—three Americans and one Canadian—remain in Houston awaiting flight. When launched, they will become the first humans to travel to the moon since Apollo astronauts last journeyed there in December 1972, more than half a century ago.