NASA targets April 1 launch for Artemis II Moon mission

NASA is preparing to launch Artemis II on April 1, bringing the United States closer to sending astronauts back to lunar orbit for the first time since 1972.

The mission will mark the first crewed flight of NASA’s Space Launch System (SLS) rocket and Orion spacecraft, carrying four astronauts on a journey around the Moon before returning to Earth. The flight will serve as a crucial test of systems designed to support future human landings on the lunar surface under the Artemis program.

“This mission will prove Orion’s life-support systems are ready to sustain crew on future missions and allow the crew to practice operations essential to the success of Artemis III and beyond,” NASA said.

Preparations are underway at Kennedy Space Center, where engineers are completing final integration work inside the Vehicle Assembly Building. NASA said the rocket is expected to roll out to the launch pad on March 19 ahead of the April launch window.

Once at the pad, teams will conduct additional testing, including another wet dress rehearsal — a full launch countdown simulation during which the rocket is fuelled with cryogenic propellants to ensure all systems function as expected before liftoff.

Technical issues during earlier tests

The mission timeline has faced delays after engineers detected technical issues during earlier drills. During one test, teams identified a helium flow problem in the rocket’s upper stage, which helps pressurize propellant tanks and maintain engine conditions.

NASA later traced the issue to a faulty seal in the quick-disconnect system linking ground helium supply lines to the rocket. Engineers repaired the seal and confirmed the fix through validation tests.

Earlier rehearsals had also detected a liquid hydrogen leak, forcing NASA to halt the countdown and carry out additional troubleshooting before continuing launch preparations.

Despite the setbacks, NASA officials said such tests are designed to detect problems before launch. Artemis II will be the first crewed mission of the Artemis program since the end of the Apollo program in 1972 and will help pave the way for Artemis III, which aims to land astronauts on the Moon later this decade.