Four crew members spent 365 days in a 1,700 sq ft, 3D-printed Mars habitat in isolation. How could it help NASA prepare for living on the Moon?

Spending a year acting like they were living on the Red Planet could yield a few valuable lessons for NASA in a slightly more accessible place – the Moon. Four individuals who had been living in a simulated Martian habitat in Houston for several months are close to finishing an experiment aimed at studying how people survive when isolated, resource-constrained and far away from their natural surroundings. The CHAPEA study conducted by NASA aims to address challenges faced by humans when living off-Earth.

Even though the experiment creates conditions related to a Mars mission, its results can be used for planning lengthy stays in lunar habitats, where astronauts would have to take care of their health, conduct experiments, and lead a normal life under difficult conditions.

CHAPEA mission two commenced on October 19, 2025, when Ross Elder, Ellen Ellis, Matthew Montgomery, and James Spicer were confined in a 1,700-square-foot 3D-printed habitat created at NASA's Johnson Space Center in Houston. This 378-day confinement has made them participants in an experiment that is aimed at studying the performance of humans in space.

Life inside a Mars habitat offers lessons for Lunar living

Inhabiting life on other planets is far from simply landing there. The astronauts need to create some sort of routine, organise the supply of resources, take care of equipment, and carry out difficult tasks, all within a restricted environment. NASA's CHAPEA project addresses such issues without the need to send astronauts outside Earth.

Within the experiment, the four volunteers have been growing crops, managing their resources, performing the activities that would be expected of them if they were working on Mars, and also doing activities wearing suits simulating extravehicular activity.

Such an environment applies to the future moon stations, as the crew there will also have limited availability of food, equipment, space to live and an opportunity to go back to Earth. Although the Moon differs from Mars in its conditions, both these planets would require properly organised life support and regular activities.

In particular, NASA needs to learn how the resource availability affects the ability of the crew to perform tasks.

In fact, producing food does not seem to be purely an experimental activity. The production of food, the supply and the nutrition of astronauts may affect their stay on the base and the amount of work they are able to do.

Even though the simulation does not allow scientists to simulate every environmental danger of a mission to the Moon or Mars, it allows them to study some aspects.

Communication delays could change how astronauts make decisions

Among the major obstacles in exploring deep space is that astronauts will be further away from their Earth supporters. Unlike astronauts aboard the ISS, the Mars explorers would have to wait significantly longer for help and response from the control room back on Earth.

The CHAPEA experiment by NASA uses delayed communication in order to study how the crew works without receiving immediate help.

As far as a mission to Mars is concerned, the communication delays could be up to 45 minutes in each direction, which will complicate any instant conversations and quick decisions.

Under such conditions, it will be up to the astronauts themselves to analyse situations, communicate with their colleagues and act on their own initiative. The general idea could be applied to the lunar base as well.

Scientists are looking into ways in which crews can maintain a balance between their independence and proper guidance from Earth.

In addition, it is necessary to determine what kind of data should be available to the astronauts for making the right decisions and whether any decision-support systems can be applied for coping with the novel situations.

In addition, medical issues cannot be ignored since a distant crew cannot always rely on fast help from the specialists. It is necessary to prepare for everything and be able to handle the problem on one's own.

Finally, the study gives researchers the chance to examine teamwork under difficult conditions because the crew living in the isolated habitat will need good communication and wise decisions every day.

Post-mission assessments will help NASA understand crew health

This is the start of yet another stage that will come to pass once the simulated space mission comes to an end – analysing the experiences of the crew members.

After the participants leave the facility, the plan is to allow them some time to reunite with their families while undergoing approximately two weeks of debriefing sessions with scientists from NASA.

The debriefing process will allow the researchers to study the adaptation process of the participants within a confined environment that requires hard work.

In addition, the health and performance information gathered during the mission can be used to study the correlation between the conditions and the ability to complete assigned tasks.

Grace Douglas, the CHAPEA principal investigator, expressed her pride in the dedication of the crew to such a challenging mission.

Chief scientist for NASA's Human Research Program Michael Stenger said the study would help in understanding the needs of a year-long mission, such as medical and psychological support under communications delay.

He emphasised the potential benefits of having a realistic simulation of a mission in combination with physiological, psychological, and performance measurements.

Results can help NASA determine where future teams require better equipment, revised procedures, or more assistance. Results may also influence planning for moon bases where astronauts' well-being will be crucial for sustainable activities.

Nevertheless, CHAPEA is not a simulation of a mission on the Moon, and the results will have to be considered in the context of the difference between simulated and real missions.

Nonetheless, long-term observation of participants in a controlled environment can offer researchers an opportunity to study issues that cannot be understood by short-term research alone.

While preparing longer missions, NASA will find the experience gained by these four participants helpful in making decisions concerning the design of habitats, meals, medical readiness, and astronauts' independence.

The general purpose of the research is to learn not only how to send astronauts to another planet, but also how to make them work there.