Flying by the moon, witnessing an eclipse, and traveling farther from Earth than any humans have before: The four astronauts of NASA's Artemis II mission have hit many milestones since launching from Kennedy Space Center nearly 10 days ago.
Now, if all goes according to plan Friday, they'll have completed their most important one: making it home.
The crew's Orion space capsule is scheduled to enter the atmosphere at 7:53 p.m. ET, just southeast of Hawaii. About 13 minutes later, it should splash down in the Pacific Ocean off the coast of San Diego.
To make it there, the spacecraft will first have to punch through the Earth's atmosphere at about 25,000 miles per hour and experience temperatures upwards of 5,000 degrees Fahrenheit.
As mission pilot and NASA astronaut Victor Glover put it: It's like "riding a fireball through the atmosphere."
The trip home
The Artemis II crew — Glover, his NASA crewmates Reid Wiseman and Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen — have been preparing for the return home for the past few days, which includes packing up equipment and reorienting the spacecraft for an ideal trajectory that will land them safely in the Pacific at 8:07 p.m. ET.
On return day, the crew will wake up at 11:35 a.m. and begin reconfiguring the Orion capsule for reentry. They will make an additional course correction to fine-tune the return trajectory at 2:53 p.m.
Before entering the atmosphere, the spacecraft will need to ditch its service module — which housed thrusters, solar panels and other spaceflight hardware for the mission. Orion will separate from the service module at 7:33 p.m., which will then fall back to Earth, burning up in the atmosphere.
Orion, if all goes well, will avoid that fate. The spacecraft is set to begin its 13-minute plunge through the atmosphere at 7:53 p.m. During that time, it's expected that the crew will lose communication with Mission Control for about six minutes.
Much of Orion's speed will be lost as it plummets through the atmosphere. As the capsule nears the Earth's surface, a series of parachutes will help it to slow down even further, to a mere 20 miles per hour upon splashdown.
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.
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