Four Artemis II Astronauts Return from Moon Orbit, NASA Eyes Damaged Hardware

The first humans to travel toward the moon in more than 50 years are back on Earth. NASA's Artemis II mission splashed down in the Pacific Ocean at 8:07 p.m. ET on Friday, April 10, off the coast of San Diego, as commander Reid Wiseman reported "four green crewmembers" to Mission Control. Within two hours, all four astronauts were aboard the USS John P. Murtha for medical evaluations.

The final mission numbers, provided by NASA's flight dynamics team, put the total distance flown at 700,237 miles. The capsule reached a peak velocity of 24,664 mph. It landed within less than a mile of its target. Mission Control called it a perfect bullseye.

That precision mattered more on this mission than almost any before it. The Orion spacecraft, named Integrity by the crew, carried a heat shield with a known design flaw inherited from the 2022 Artemis I test flight. After Artemis I returned, NASA's Office of the Inspector General found more than 100 locations where ablative material cracked and blew away in chunks rather than gradually burning off as designed. Replacing the shield before this flight was not an option — it had already been installed before Artemis I ever launched.

NASA's solution was to change how the capsule came home. Engineers used a more porous Avcoat formulation that allowed hot gases to escape, and modified the reentry trajectory to shorten the skip phase and maintain higher temperatures, ensuring the outer char layer never cooled enough to trap gas beneath it. The approach worked. The capsule survived.

Not everyone had believed it would. Former NASA engineer and heat shield expert Charles Camarda publicly warned that the agency did not fully understand the root cause of the cracking and that the modified trajectory amounted to "playing Russian roulette." NASA stood by its data. The crew stood by NASA.

Pilot Victor Glover had been thinking about reentry since the crew's assignment was announced in April 2023. "We have to get back," he said Wednesday before splashdown. "There's so much data that you've seen already, but all the good stuff is coming back with us."

The inspections are now underway. Two heat shield experts boarded the Murtha immediately after recovery to begin examining the capsule. NASA's Orion program manager Howard Hu said engineers will conduct detailed scans at Kennedy Space Center in Florida and spend several days assessing whether anything anomalous occurred during reentry.

The heat shield is not the only item on the list. Mission managers said at the post-splashdown news conference that the Orion service module will need a valve redesign, the spacecraft's toilet will also need attention, and there is not much time to resolve any of it — Artemis III is slated for next year. NASA associate administrator Amit Kshatriya acknowledged the tight turnaround directly.

The mission launched April 1 at 6:35 p.m. ET from Kennedy Space Center's Launch Pad 39B, sending humans beyond low Earth orbit for the first time since Apollo 17 in December 1972. The crew swung around the far side of the moon on April 6, exited the lunar sphere of influence on April 7, and made their way back to Earth across nine days.

Artemis III, which will attempt an actual lunar landing, is next. How quickly the agency can work through its punch list will determine whether that schedule holds.