After 378 days without windows, the sounds of the outside world, or real-time calls with family and friends, four research volunteers stepped out of NASA\u2019s Mars Dune Alpha habitat on Oct. 31, completing the agency\u2019s second yearlong Mars surface simulation.\u00a0<\/p>\n
Ross Elder, Ellen Ellis, James Spicer, and Matthew Montgomery\u00a0entered the roughly 1,700-square-foot, 3D-printed habitat at NASA\u2019s Johnson Space Center in Houston on Oct. 19, 2025, for CHAPEA (Crew Health and Performance Exploration Analog) Mission 2.\u00a0<\/p>\n
The crew participated in simulated Marswalks, robotic operations, habitat maintenance, exercise, and crop cultivation.\u00a0<\/p>\n
\u201cTheir work means more than completing a mission,\u201d said Johnson Director Vanessa Wyche. \u201cIt is about preparing for the challenges of human exploration beyond Earth, gathering the knowledge we need to protect crew health and performance, and paving the way for future missions to the Moon and, one day, Mars.\u201d\u00a0<\/p>\n
NASA astronaut Jack Hathaway put the crew\u2019s time in isolation into perspective: While they were inside the habitat, he completed a 237-day mission aboard the space station and returned to Earth.\u00a0\u00a0<\/p>\n
During that same period, the\u00a0Artemis II<\/a> astronauts traveled around the Moon and set the record for the farthest humans have traveled from Earth. NASA also celebrated 25 years of continuous human presence<\/a> aboard the International Space Station on Nov. 2, 2025.\u00a0<\/p>\n \u201cThe reality of what you guys did here required immense physiological and psychological strength, teamwork, and human grit,\u201d Hathaway said.\u00a0<\/p>\n Supported by researchers and ground teams across the agency, the CHAPEA crew collected health and performance data while navigating limited resources and communication delays of up to 22 minutes each way.\u00a0\u00a0<\/p>\n Elder brought a U.S. Air Force experimental test pilot\u2019s approach to leading the crew. He found simulated Marswalks and robotic exploration \u201cuncannily similar\u201d to operating as part of a flight. From inside the habitat, crew members remotely operated a drone and a rover to survey terrain and identify or collect rock samples.\u00a0\u00a0<\/p>\n The demanding Marswalk schedule also sharpened his understanding of the physical preparation future explorers will need. Preparing suits, completing airlock procedures, and making long traverses took time and stamina. He emphasized nutrition, exercise, and rest as essential to sustaining that pace.\u00a0<\/p>\n His steadfast leadership and mission focus drew praise at egress for keeping the team motivated and improving. For Elder, seeing his crewmates combine their strengths was a highlight of the mission.\u00a0<\/p>\n \u201cThe real magic has been the privilege and pleasure of seeing everyone come together, with the makings of one of the finest teams I\u2019ve ever been a part of,\u201d Elder said.\u00a0\u00a0<\/p>\n Ellis, a U.S. Space Force officer with experience at the National Reconnaissance Office, brought a background in military operations and systems engineering. As medical officer, she helped organize biological sample collections and prepare supplies for the crew\u2019s health research.\u00a0\u00a0<\/p>\n As procedures became familiar, she emphasized the discipline needed to follow every step carefully. She also enjoyed solving problems with the tools available. \u201cThere is a kind of tactical creativity that I find energizing,\u201d she said.\u00a0<\/p>\n Contributing to human spaceflight research helped sustain her motivation. So did the relationships with her crewmates. \u201cIt would be difficult to convince someone who has never lived in isolation that most days, I don\u2019t feel isolated. I have three teammates that I rely on every day to get through the mission.\u201d\u00a0<\/p>\n She also credited exercise, behavioral health, nutrition, and medical specialists for their coordinated support throughout the mission.\u00a0<\/p>\n \u201cWhen I look back on the mission, the most salient point I\u2019ve learned is that a future Mars crew requires a highly integrated ground team,\u201d Ellis said.\u00a0<\/p>\n Spicer brought experience in satellite communications and spacecraft development to the habitat\u2019s maintenance work. At egress, he was thanked for keeping its systems running smoothly and described as the \u201cflight engineer extraordinaire and resident data scientist.\u201d\u00a0<\/p>\n He compared the year to living aboard a submarine or boat, where limited supplies and space shaped daily decisions. The crew tracked consumables from dish soap to respirator filters and carefully managed food and water.\u00a0<\/p>\n The crew had access to resources that provided news, and Spicer was surprised by how little he missed constant news and social media updates. The break from distractions helped him focus on the mission.\u00a0<\/p>\n Inside the habitat, stories and jokes around the kitchen table brought laughter to demanding days. He told his crewmates they had made the year \u201cnot a chore, but a joy.\u201d\u00a0<\/p>\n \u201cWe\u2019re inspired every day knowing that the data we\u2019re generating is informing Martian mission planning and increasing the safety, health, performance, and comfort of future Martian crews,\u201d he said.\u00a0<\/p>\n Montgomery brought experience in hardware engineering, robotics, technology startups, and independent films. At egress, he was described as the \u201cSwiss Army knife of crewmates\u201d for his technical knowledge and problem-solving skills.\u00a0<\/p>\n He helped crewmates identify rock samples collected during simulated Marswalks and set up the habitat\u2019s 3D printing capabilities. His background in indoor agriculture also carried into a seed-germination experiment that used a control and simulated Martian soil.\u00a0\u00a0<\/p>\n Maintaining a consistent data set remained a priority. Montgomery learned to investigate anything that gave him pause, describing instances when speaking up helped identify concerns with equipment, safety, and data quality.\u00a0<\/p>\n He also learned to give himself more grace when an outcome fell short. \u00a0<\/p>\n At egress, he credited the crew\u2019s different perspectives with producing solutions stronger than any member could have developed alone.\u00a0<\/p>\n \u201cIt\u2019s really the people that make exploration possible,\u201d he said.\u00a0<\/p>\n Looking Toward Mars\u00a0<\/p>\n Two weeks of post-mission evaluations and debriefs will help researchers interpret the crew\u2019s data alongside their experiences. The study builds on the first CHAPEA mission, which concluded July 6, 2024.\u00a0\u00a0<\/p>\n Grace Douglas, CHAPEA\u2019s principal investigator, said the research will help NASA weigh human health and performance risks against resources, including crew time, communication capacity, and food and water system designs. She also noted that many resource challenges facing space explorers mirror problems on Earth.\u00a0<\/p>\n