Four people have now spent a full year living as if they were on Mars, without leaving Texas. NASA said on October 19 that the crew of CHAPEA Mission 2 had reached the one-year mark of a 378-day mission inside a 3D-printed habitat at Johnson Space Center in Houston. They're due to step out on Saturday, October 31.
The crew, as NASA lists them, are commander Ross Elder, medical officer Ellen Ellis, science officer Matthew Montgomery and flight engineer James Spicer. They entered the 1,700-square-foot habitat on October 19, 2025.
What a year "on Mars" involves
CHAPEA stands for Crew Health and Performance Exploration Analog, and the point is to recreate the conditions of a Mars mission as closely as possible on the ground. According to NASA, that has meant communication delays with Earth of up to 45 minutes each way, limited resources including food and exercise systems, isolation and confinement, suited spacewalks on a simulated Martian surface, and growing crops. NASA says the crew also carried out an extravehicular geological activity and performed medical tasks and maintenance during simulated spacewalks.
That list is a reminder that the hard part of Mars isn't only the rocket. A 45-minute delay each way means a crew can't simply call mission control in an emergency and wait for advice. They have to make decisions themselves. NASA's own description of the research points straight at that, citing crew autonomy and decision-making support for operating under communication delays.
Space.com's coverage of the programme's first crew in 2023 gives a sense of the bar to get in: candidates needed a STEM background and professional experience in the field, and had to pass the same physical and psychological testing as astronaut candidates. That report also described the habitat, Mars Dune Alpha, and the everyday work involved, from cooking and cleaning to habitat maintenance, as well as stressors such as equipment failures.
What NASA says it's learning
NASA's people are careful about what they claim so far. Michael Stenger, chief scientist for NASA's Human Research Program, said the mission "has been incredibly valuable in starting to teach us how to understand requirements for year-long missions, including medical and psychological care, via communication delays." Combined with physiological, psychological and performance measures in "a rigorously controlled environment," he said, "we'll be able to translate the knowledge from these experiences to Moon Base and beyond."
Grace Douglas, CHAPEA's principal investigator, focused on the crew: "We are extremely proud of the crew for their commitment and achievements over the last year on such a fast-paced, highly demanding mission." She added that "the entire CHAPEA team is excited to congratulate the crew in person."
Note the phrasing: "starting to teach us." NASA hasn't published findings from Mission 2 yet, and this update doesn't claim any. That's the right way to read the milestone. It's a successful year of data collection, not a set of conclusions.
What happens next
The crew leaves the habitat on October 31. After that, NASA says, they begin two weeks of post-mission evaluations and debriefs. Any results will come later, and NASA hasn't given a date for them.
Here's the analysis for why it's worth following: long-duration missions to the Moon and eventually Mars will depend as much on how people cope with isolation, delay and limited resources as on hardware. CHAPEA is one of the few ways to study that for a full year without leaving the ground. On October 31, four people will open a door they've kept shut since last October, and the more interesting part of the mission, finding out what it taught, begins.
Reporting notes