GOLDEN, Colorado — Scientists are laying the scientific and technical groundwork for one of humanity’s most audacious goals: transforming Mars from a frozen desert into a world where life can thrive. And they are starting small — with less than 1 kilogram (2.2 pounds) of artificial particles released into the Martian sky.
Researchers gathered here at the Colorado School of Mines in early June for the 26th Space Resources Roundtable to debate the feasibility of terraforming the Red Planet. The centerpiece of the discussion was a detailed research roadmap that does not assume warming Mars is desirable, but instead methodically identifies what would be required, what it would cost, and what could go wrong.
“Creating sustainable habitats and biospheres beyond Earth is an enormous scientific and technical challenge, but it’s one we’ll have to surmount if we’re going to extend life beyond Earth,” Edwin Kite, an associate professor of geophysical sciences at the University of Chicago, told Space.com during the conference.
“We do not yet know enough to create a biosphere from scratch,” Kite added. “Applied astrobiology, like planetary science, requires contributions from many disciplines.”
A New Field: Applied Astrobiology
The term “applied astrobiology” is emerging as a framework for this work — a discipline that bridges planetary science, engineering, biology, and ethics to evaluate what it would actually take to establish sustainable biospheres beyond Earth. It moves beyond the question of whether life could exist on Mars and asks how humanity might enable it.
The research blueprint, led by Kite and published on the arXiv preprint server (arXiv:2604.02242), identifies several parallel approaches to warming Mars. The most near-term option involves solid-state greenhouse membranes, which could offer immediate benefits for moisture farming and life support at early human bases. A more ambitious approach would strengthen the planet’s natural greenhouse effect to warm large regions of the globe, though many scientific questions remain unresolved.
The Aerosol Demonstration Mission
The most urgent step, however, is proving that Mars’ atmosphere can be deliberately warmed at all. Kite presented a mission concept prototype designed to validate aerosol dispersal — releasing engineered particles into the atmosphere to trap heat.
The proposed payload is deceptively simple: an automated system that would release less than 1 kilogram (2.2 pounds) of sub-micron artificial particles at an altitude of roughly 500 meters (1,640 feet). A laser tracking system would confirm the plume’s ascent and behavior in the thin Martian air.
But the engineering challenge is significant. The dispenser requirements are particularly demanding and must be proven on Earth before any interplanetary test. A prototype experimental setup has already been designed and built for rapid deployment, with plans to test it this year at NASA’s Planetary Aeolian Laboratory (PAL) at Ames Research Center in California. PAL can simulate conditions under different planetary atmospheres, including Earth, Mars, and Titan.
Warming With Martian Dirt
A complementary approach, published last year in the journal Science Advances, proposes using nanoparticles manufactured from Martian soil itself. Researchers from the University of Central Florida, Northwestern University, and the University of Chicago modeled the efficacy of tiny reflective nanorods made from iron and aluminum — materials abundant in Martian regolith.
These nanorods, measuring far smaller than commercially available glitter, would be launched into the atmosphere by ground-based “fountains.” Once aloft, they would interact with incoming sunlight in a specific way, preferentially forward-scattering solar energy to the surface below.
“The interaction of those particles with the incoming sunlight would then cause that solar energy to be preferentially forward scattered to the surface,” said Ramses Ramirez, a planetary scientist at UCF and co-author of the study. “That would then cause a very strong greenhouse effect, and we can warm it up several tens of degrees.”
The study found that these engineered nanorods could be roughly 5,000 times more effective at warming Mars than previously considered approaches, such as releasing carbon dioxide or chlorofluorocarbons. Because the raw materials are already present on Mars, the approach dramatically reduces the cost of transporting resources from Earth.
The Scale of the Challenge
Despite these promising avenues, the timeline remains long. “Even under optimistic assumptions, warming at kilometer scale is at least a decade away, and wider environmental modification would require sustained investment over many decades beyond that,” Kite and his colleagues wrote.
Mars presents formidable obstacles. Its atmosphere is roughly 100 times thinner than Earth’s, with an average surface pressure of just 6 to 7 millibars (0.087 to 0.102 psi) compared to Earth’s 1,013 millibars (14.7 psi). The atmosphere is 95% carbon dioxide, with only trace amounts of oxygen. Surface temperatures average around minus 63 degrees Celsius (minus 81 degrees Fahrenheit), far below the freezing point of water.
The planet also lacks a global magnetic field, meaning the solar wind continuously strips away atmospheric gases. Any long-term terraforming effort would need to contend with this steady loss of atmosphere — either by replenishing it faster than it escapes or by deploying a planetary-scale magnetic shield.
Knowledge Gaps That Must Be Filled
The research roadmap identifies several critical unknowns that must be addressed before any large-scale terraforming can proceed. Scientists need better maps of subsurface water ice deposits to understand what resources are available. They need dedicated climate-monitoring orbiters to observe Mars’ natural atmospheric variability. And perhaps most fundamentally, they need to know whether Mars already hosts life.
“If there is extant life on Mars, that changes the ethical calculus entirely,” Kite noted. The issue of planetary protection — avoiding contamination of Martian ecosystems — is a central concern in the applied astrobiology framework.
The return of Martian samples to Earth, long a priority for the scientific community, would help answer many of these questions. China’s Tianwen-3 mission has revised its plans to use a helicopter for wide-area sample collection, and Kite expressed hope that samples from all missions would be shared internationally.
A proposed International Mars Ice Mapper orbiter, studied by NASA, JAXA, CSA, and ASI, appears shelved for now. “It’s a good idea and could always come back,” Kite said.
Keep the Option Open
The most striking conclusion of the research roadmap is not that terraforming Mars is within reach, but that it might not be as far out of reach as commonly assumed — provided work begins now.
“Relatively modest research investments would keep open the option of extending life beyond Earth as Mars’ scientific exploration continues,” Kite and his colleagues concluded.
The approach is inherently modular, they point out, meaning warming experiments can be conducted in parallel at multiple sites, gradually building toward global-scale change. If early aerosol-release demonstrations on Mars prove successful, those results would provide the quantitative basis for government-scale programs to evaluate whether extending habitable conditions beyond Earth is achievable, at what cost, and on what timescale.
For now, the work remains in the laboratory and in computer models. But for the first time, there is a roadmap — incomplete, uncertain, and full of hazards, but a roadmap nonetheless — for how humanity might one day turn the Red Planet green.