WATCH LIVE: Artemis II astronauts have splashed down on Earth

NASA astronauts Reid Wiseman, Victor Glover and Christina Koch and Canadian Space Agency astronaut Jeremy Hansen were ensconced in the Orion space capsule when they dropped into the Pacific Ocean off the coast of San Diego at 8:07 p.m. Friday. The USS John P. Murtha is stationed near the splashdown zone to help recover the crew.

The USS John P. Murtha is stationed near the splashdown zone and will help recover the crew. A team will head out to the floating capsule and install an inflatable raft just below Orion's side hatch. The crew will be examined by a flight surgeon, then helped out of the capsule. From the transport ship, they will hitch a ride back to Johnson Space Center in Houston.

Risk of reentry

There's always risk when returning from space. Glover said that he has been thinking about this portion of the mission since he was selected for it back in 2023, and he's been looking forward to it ever since.

"We have to get back," he said from the Orion capsule Wednesday. "There's so much data that you've seen already, but all the good stuff is coming back with us. There's so many more pictures, so many more stories, and, gosh, I haven't even begun to process what we've been through."

To get back, the capsule must hit the atmosphere at a precise angle.

"Let's not beat around the bush," said Jeff Radigan, Artemis II's lead flight director. "We have to hit that angle correctly. Otherwise, we're not going to have a successful reentry."

All eyes will be on the heat shield — this is the piece of hardware beneath the capsule that protects the crew from the extreme temperatures during reentry. NASA tested it out on Artemis I, the previous, uncrewed mission, and found that the heat shield wasn't performing as designed.

NASA mission planners and the Artemis II team worked on a way to mitigate that risk. Instead of "skipping" through the atmosphere like Artemis I, this mission would hit the atmosphere steeper and faster, limiting the time the spacecraft spends in those fiery, energetic moments of reentry.

"It's 13 minutes of things that have to go right," said Radigan. "I have a whole checklist in my head that we're going through of all the things that have to happen."

Mission success

The Artemis II mission is a key flight test for Orion, and thus far, mission managers have been pleased with the results. The spacecraft has taken humans farther from Earth than they've ever been, breaking a record set by Apollo 13 astronauts in 1970.

The crew tested the manual control of the spacecraft, which will be needed for future missions that will dock with a lunar landing system. The mission tested the spacecraft's life support systems and ability to keep four astronauts comfortable within the confined space.

Artemis II returned humans to the moon for the first time since the Apollo program over 50 years ago. And while some astronauts back then did see the far side of the moon, the Artemis II crew was able to observe it from a vantage point never before seen by humans. Their images and geological notes will help better determine what the moon is made of and where it came from.

While some of the astronauts' observations may help scientists understand the distant past, others will help mission managers better plan for the future. Case in point: The crew tested out the very first toilet to go to the moon, and it quickly ran into issues during flight. Multiple times during the trip, the crew had to use manual urinals instead. The issue, NASA said, was not with the toilet itself, but the system that dumps the urine overboard when it gets full.

The Orion capsule will return to NASA's Kennedy Space Center in Florida after the mission, where engineers will examine the spacecraft after its flight, including a closer look at the spacecraft's plumbing. The team will be picking apart the spacecraft to see how it performed — and make any necessary changes ahead of the next mission, Artemis III, set to launch next year.