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NASA’s Artemis II Flight Readiness Review concluded on March 12, 2026, with a “go” to continue preparations toward an April launch—but not a guarantee of liftoff. The rocket still needed final work, including troubleshooting helium flow to its upper stage. Artemis II ultimately launched on April 1, flew around the Moon, and returned safely to Earth on April 10.
What NASA decided on March 12
NASA’s March 12 update reported the result of the Artemis II Flight Readiness Review, a formal assessment of whether the mission’s vehicle, systems, personnel, operations, and support infrastructure were ready to proceed. The agency polled “go” toward an April launch, with remaining open work still to be closed. That was permission to continue preparations, not unconditional launch authorization: weather, technical issues, ground systems, and countdown results could still delay an attempt. NASA’s review announcement set March 19 as the rollout target and April 1 as the planned launch attempt.
Why the rocket had returned to the assembly building
The review came amid troubleshooting of helium flow to the Interim Cryogenic Propulsion Stage (ICPS), the SLS rocket’s upper stage. The stacked SLS rocket and Orion spacecraft had been moved back into the Vehicle Assembly Building at Kennedy Space Center so teams could work on the issue. Helium is used in upper-stage systems; resolving the flow problem was part of getting the vehicle ready to return to the launch pad. NASA later adjusted the rollout target to March 20 while maintaining the April 1 opportunity. NASA’s March 9 advisory described the troubleshooting, and its March 16 update reported the revised rollout plan.
The distinction between the vehicles matters: SLS is the launch rocket, Orion is the crew spacecraft, and ICPS is the upper stage involved in the helium-flow work. The issue affected schedule confidence, but NASA’s readiness poll meant teams judged the mission could continue toward launch while completing the remaining tasks.
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The launch plan—and what actually happened
At the time of the readiness update, NASA was targeting an April 1 launch attempt. The launch window was scheduled to open at 6:24 p.m. EDT, with additional opportunities listed through April 6. A target date or launch window is an opportunity, not a promise that the vehicle will lift off. In the event, Artemis II launched from Kennedy Space Center at 6:35 p.m. EDT on April 1. NASA’s launch-coverage notice gave the planned window and opportunities; its liftoff report confirmed the actual launch.
Who flew, and what Artemis II was designed to test
The four-person crew was NASA commander Reid Wiseman, NASA pilot Victor Glover, NASA mission specialist Christina Koch, and Canadian Space Agency mission specialist Jeremy Hansen. Artemis II was the first crewed flight in NASA’s Artemis campaign: a roughly 10-day test mission around the Moon and back, not a lunar landing.
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The flight put the SLS rocket and Orion spacecraft through a crewed mission profile and gave teams the opportunity to evaluate spacecraft systems, life support, navigation, communications, and mission operations with astronauts aboard. The goal was to build experience and data for later Artemis missions. NASA’s mission account lists the crew and describes the flight.
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After leaving Earth orbit, Orion and its crew traveled to the Moon, made a lunar flyby on April 6, and returned to Earth. NASA reported a maximum distance of 252,756 miles from Earth, surpassing the 248,655-mile human-spaceflight record attributed to Apollo 13. That is the distance from Earth—not the spacecraft’s distance from the lunar surface. NASA’s flight coverage separately cited a closest approach of 4,067 miles to the Moon.
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The crew splashed down in the Pacific Ocean off San Diego at 8:07 p.m. EDT on April 10, completing the approximately 10-day mission. NASA later reported the astronauts’ return to Houston for postflight medical evaluations, reconditioning, and science debriefs. NASA’s lunar-flyby coverage details the flyby and closest approach; its return-to-Earth gallery and postflight announcement report the distance record and recovery.
The flight was not without an issue: NASA reported a brief communications loss during the post-launch perigee-raise phase, which was resolved. The crew said they could hear ground communications throughout, and NASA said teams were investigating the cause. That event occurred after launch and does not change what the March readiness review did—or did not—guarantee. NASA’s flight update described the communications event.
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Why the readiness decision mattered
A Flight Readiness Review is a significant checkpoint because it draws together the state of the spacecraft, rocket, ground systems, people, and mission procedures. The March “go” indicated NASA was prepared to advance into the final launch campaign while outstanding work remained. The subsequent launch and safe return show that the planned mission took place, but they do not mean the review removed all risk: launch readiness is conditional, and later flight operations still require monitoring and response to anomalies.
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