NASA crew completes year-long simulated Mars mission in Houston

Four volunteers concluded a 378-day mission on Saturday, Oct. 31, 2026, after living in total isolation within a 3D-printed habitat at NASA’s Johnson Space Center in Houston. The crew spent the year inside the 1,700-square-foot facility, known as Mars Dune Alpha, to help researchers study the physical and psychological effects of long-duration spaceflight.

The mission, which began on Oct. 19, 2025, served as the second of three planned Crew Health and Performance Exploration Analog (CHAPEA) projects. Throughout the duration of the study, the crew members—Mission Commander Ross Elder, Medical Officer Ellen Ellis, Science Officer Matthew Montgomery, and Flight Engineer James Spicer—performed tasks such as habitat maintenance, crop cultivation, and simulated spacewalks.

To replicate the conditions of a real mission to Mars, the volunteers operated under strict resource limitations and communication delays, mimicking the time required for signals to travel between Earth and the Red Planet. Upon exiting the habitat on Halloween, the crew was greeted by NASA officials, including astronaut Jack Hathaway.

Reflecting on the experience, Medical Officer Ellen Ellis described the crew as analog astronauts who lived in captivity by their own choice. Mission Commander Ross Elder noted that while the risks of traveling to Mars are significant, the goal remains achievable through hard work and leadership.

The crew is now entering a two-week period of debriefing and evaluation. NASA officials, including Johnson Space Center Director Vanessa Wyche, intend to use the data collected during this mission to inform future human exploration efforts on the Moon and Mars.