Artemis II Moon Mission Launch Delayed to March After SLS Rocket Leak

• February 3, 2026

NASA has announced a delay to the Artemis II mission, originally planned for February, due to technical issues encountered during a critical countdown rehearsal. The Space Launch System (SLS) rocket, which is slated to carry astronauts back to the Moon, experienced a leak that halted the test just minutes before ignition.

Leak Discovery Forces Mission Postponement

The countdown dress rehearsal, intended as a final practice before the crewed Artemis II launch, was stopped approximately five minutes before the scheduled liftoff. A combination of problems with the rocket and associated ground support facilities led NASA to pause the test and address all identified faults. The discovery of the leak specifically involving the SLS rocket prompted concerns about proceeding without thorough evaluations and repairs.

As a result, the anticipated launch window in February is no longer feasible. NASA now targets a new timeframe in March to attempt the mission after resolving the technical setbacks. The adjustment underscores the complexities inherent in preparing for human spaceflight to the lunar surface and highlights the cautious approach taken to ensure crew safety and mission success.

The Artemis II mission represents a crucial step in NASA’s efforts to reestablish human presence on the Moon and advance exploration capabilities beyond Earth’s orbit. The mission aims to send astronauts around the Moon, validating systems and procedures in preparation for subsequent lunar landings.

While NASA has yet to release detailed information regarding the nature of the leak or the specific infrastructure challenges encountered, the postponement is indicative of the rigorous testing and validation processes required before crewed launches. Ensuring the integrity of both the rocket and ground support remains a top priority.

Delays in complex spaceflight programs are not uncommon given the high standards and technical demands. NASA’s decision to defer the Artemis II launch reflects an ongoing commitment to risk mitigation and thorough readiness verification that is essential for the long-term Artemis lunar exploration program.

The next updates on the Artemis II schedule and progress toward resolving the leak issue are anticipated in the coming weeks as work continues on the SLS vehicle and related systems.

NASA postpones Artemis II crewed lunar mission to March following a leak detected during final SLS rocket countdown test.