As space agencies in Europe and beyond prepare for extended lunar stays and eventual crewed voyages to Mars, a new study offers engineers a systematic way to factor mental health into spacecraft design. Researchers at the Massachusetts Institute of Technology (MIT) and the University of Colorado Boulder have mapped how lighting, privacy, and the layout of living quarters can influence astronauts' emotional and social well-being.
The work, published in a peer-reviewed format, synthesizes decades of research on habitability in space and other extreme environments. The team identified 68 design factors and 167 connections that link physical surroundings to behavioural health outcomes. These include anxiety, homesickness, fatigue, curiosity, and the strength of bonds between crewmates.
“The awareness has been there for some time that living in space is difficult,” said Mich Lin, lead author and PhD candidate in MIT's Human Systems Lab and Engineering Systems Lab. “We’ve come a long way from the human in a tin can. As our priorities shift toward long-duration exploration missions, making sure a crew is safe, healthy, happy, and productive becomes even more important.”
Designing for the mind, not just survival
Historically, habitats for extreme environments—submarines, Antarctic research stations, and spacecraft—have been engineered primarily for physical survival. But spaceflight imposes unique psychological strains: isolation, confinement, disrupted day-night cycles, and the absence of familiar social contact. On a months-long voyage to Mars, astronauts would live with the same small group, far from Earth, with no possibility of stepping outside.
The new framework gives designers concrete levers. For example, lighting can be tuned to support circadian rhythms, improving sleep and mood. Privacy levels can reduce stress and enhance a sense of autonomy. The arrangement of shared spaces, corridors, and entrances influences how often crew members encounter each other, which in turn can foster friendships or, conversely, create friction.
“The connection between habitat and behavioural health has not been made in this format before,” Lin said. “So we made those connections for the first time.”
The researchers also suggest that allowing astronauts to personalise or reconfigure their living spaces could reduce homesickness by fostering a stronger attachment to their environment. Such features might include adjustable partitions, movable furniture, or even digital displays that mimic Earth scenes.
A tool for Earth as well as space
The interactive map, called the Human-Environment Connection and Interaction Atlas (HECIA), is available online for designers to explore. While the primary focus is space, the same principles apply to terrestrial settings where people endure long periods of isolation and confinement—such as polar research stations, offshore oil platforms, and submarines.
European space efforts, including those led by ESA and national agencies in France, Germany, and Italy, are already studying long-duration missions. The findings could inform the design of future lunar habitats under the Artemis programme, as well as Mars mission concepts. The approach also resonates with broader discussions about mental health in extreme environments, a topic that has gained attention as wildfire smoke and other environmental stressors affect populations worldwide.
While the study is based on existing literature, the researchers stress that it is a starting point. Future work will need to validate the connections in real missions and refine the model as more data from long-duration spaceflight become available.
For now, the map offers a practical tool for engineers who might otherwise overlook the psychological dimensions of habitat design. As humanity pushes deeper into the solar system, ensuring that astronauts remain mentally resilient will be as critical as the technology that carries them there.
