Four Volunteers Begin Year-Long Mars Mission Simulation in Houston

Inside a 1,700-square-foot, 3D-printed habitat on the Johnson Space Center campus, four volunteers are now more than five months into a 378-day simulation of life on Mars, eating freeze-dried meals, tending a vegetable garden, and managing simulated equipment failures that mission control won't even hear about for 22 minutes after they occur.

The crew, which entered the habitat called Mars Dune Alpha on October 19, 2025, will not emerge until October 31, 2026. Ross Elder serves as commander, an Air Force pilot leading a team that includes Ellen Ellis, a Space Force acquisitions officer serving as medical officer; Matthew Montgomery, an engineering design consultant acting as science officer; and James Spicer, an aerospace technical director and the mission's flight engineer. More than 4,000 people applied to join them. Four were chosen.

The mission is NASA's Crew Health and Performance Exploration Analog, known as CHAPEA, in its second iteration. Funded through the agency's Human Research Program at Johnson Space Center, CHAPEA is designed as a series of three year-long simulations meant to stress-test human factors before NASA attempts crewed Mars expeditions it has targeted for as early as the 2030s. The first CHAPEA crew completed an identical 378-day stint in July 2024. A third mission is expected to begin later this year.

Each day inside Mars Dune Alpha combines structured scientific research with the operational grind of simulated Mars life: mock spacewalks conducted in a regolith-floored sandbox with Martian surface imagery projected on the walls, robotic operations, habitat maintenance, physical exercise, and crop cultivation. The habitat is stocked with prepackaged, shelf-stable food, supplemented by whatever peppers, tomatoes and other vegetables the crew can grow in the onboard crop area. Spicer, whose professional background includes building satellite communications networks and space data relay systems, has said returning to real food ranks among his most anticipated moments once the mission ends, a detail that reflects how deliberately total the deprivation is designed to be.

The 22-minute one-way communication delay is among the most operationally consequential elements of the experiment. Any problem inside the habitat takes 22 minutes to reach mission control and another 22 minutes for a response to arrive. That 44-minute round trip forces the crew to diagnose and resolve failures independently, replicating the autonomy a real Mars crew would need on a mission where Earth-based help is physically unreachable.

For Harris County's space economy, the payoff from those 378 days extends well beyond the four people sealed inside. The cognitive and physical performance data generated by Elder, Ellis, Montgomery and Spicer will flow directly into the engineering and life-science planning cycles at Johnson Space Center, shaping specifications for habitat design, nutrition standards, medical protocols, and remote-operation procedures. Those specifications carry procurement weight, sustaining the aerospace suppliers, biomedical firms, and university research collaborators concentrated across the Houston metropolitan area.

With the third CHAPEA mission still ahead and NASA's Artemis program building toward lunar and eventual Mars operations, Johnson Space Center's role as the country's primary hub for analog human-spaceflight research is not a legacy designation. It is an active one, and it is being earned one freeze-dried meal at a time.