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After 378 Days Inside Fake Mars, Crew Steps OutTechnology
Four volunteers have finished a 378-day stay inside NASA’s simulated Mars habitat in Houston, giving researchers a year of evidence on life far from Earth.
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A year-long experiment in living like Mars explorers has come to an end in Texas, where four volunteers walked out of a sealed, 3D-printed habitat after 378 days inside. The mission, run by NASA at its Johnson Space Center in Houston, was designed to learn how people cope, work and stay healthy when a real journey to Mars would keep them far from home for months at a time.
The crew entered the habitat, known as Mars Dune Alpha, on 19 October 2025. The structure covers about 1,700 square feet and was built to feel like a small base on another world, with private sleeping quarters, shared living space and work areas. For more than a year, the four lived and worked there without stepping outside into normal life, following a daily routine shaped by the demands of a simulated planetary mission.
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Who spent a year inside
The team was made up of commander Ross Elder, medical officer Ellen Ellis, science officer Matthew Montgomery and flight engineer James Spicer. Together they formed the second crew of NASA’s Crew Health and Performance Exploration Analog programme, usually shortened to CHAPEA. A first crew had already completed a similar 378-day stay in 2024, and further simulated missions are planned as part of the same programme.
Inside the habitat, the crew carried out a wide range of tasks. They grew crops in material intended to imitate Martian soil, practised simulated spacewalks, looked after their equipment and kept the base running day by day. Messages to mission control were deliberately delayed, so the team had to practise making decisions on their own rather than waiting for instant instructions, much as a real Mars crew would when signals take many minutes to travel between planets.
Why NASA runs the experiment
Researchers are interested in more than the technical side of the mission. Living in a small, closed space for a full year tests sleep, mood, teamwork, appetite and physical health, as well as how people handle routine, isolation and limited contact with the outside world. The data gathered during the stay is expected to help planners design better habitats, schedules and support systems for long journeys in deep space.
NASA has explored Mars with robotic rovers and orbiting spacecraft, and it has stated an ambition to send astronauts to the planet as early as the 2030s, after first returning people to the Moon. A simulated mission cannot reproduce the lower gravity or radiation of a real Mars trip, but it can reveal practical problems early, from food production and water use to the way a small group resolves disagreements under pressure.
Speaking after emerging on Saturday 31 October, Ellis described the experience as an intense year spent willingly in confinement, and stressed that the window for keeping the United States at the forefront of space exploration should not be missed. Her remarks underlined a wider point made throughout the programme: the hardest part of a Mars journey may not be the rocket, but keeping a healthy, effective crew together for the whole voyage.
The end of this mission does not close the programme. NASA plans further long simulations, including another Mars simulation and work linked to lunar missions, so that lessons from this crew can be tested again with different teams and improved designs. For now, the four volunteers return to ordinary life after a year in which their home was a printed habitat, their sky was a ceiling, and their nearest neighbours were mission controllers speaking through a time delay.
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