A NASA-funded study concluded that Mars cannot be terraformed using present-day technology, challenging long-standing ambitions for human colonization. Researchers found that releasing all accessible carbon dioxide would raise surface pressure to only about seven percent of Earth’s, leaving the planet cold, exposed to radiation, and reliant on sealed habitats.
The vision of Mars as humanity’s inevitable second home has long anchored both science fiction and the slide decks of private space advocates. Yet a rigorous look at planetary realities reveals a stark divide between surviving on the red planet inside engineered enclosures and actually transforming the world into a new Earth.
The Harsh Reality of the Martian Surface
Understanding why colonization remains intensely difficult begins with the atmosphere, which dictates the terms for human survival according to NASA’s summary of the planet. Mars features an atmosphere composed of about 95 per cent carbon dioxide, with surface pressure averaging less than one per cent of Earth’s sea-level pressure. This environment is close enough to a vacuum that water boils at normal human body temperature.
An unprotected visitor on the Martian surface would face immediate vaporization of body tissues rather than a slow asphyxiation, making breathing gear alone entirely insufficient. Beyond the thin air, the average temperature hovers near minus 60 degrees Celsius, while local gravity is roughly 38 per cent of Earth’s. Without a global magnetic field or a protective atmosphere, cosmic radiation pummels the ground directly. Measurements from the Curiosity rover recorded a surface dose of approximately 0.7 millisieverts daily, vastly exceeding typical background exposure on Earth. Furthermore, the soil is laced with toxic perchlorates that threaten human thyroid function and would require extensive chemical scrubbing before any crops could be grown.
Why Terraforming Remains Out of Reach
The ambition that washes away these hostile conditions in one sweep is terraforming—the concept of thickening the atmosphere until the planet warms and retains liquid water. To test this hypothesis, researchers Bruce Jakosky and Christopher Edwards published a landmark study in Nature Astronomy in 2018 examining two decades of spacecraft data.
The investigators tallied all available carbon dioxide locked within polar ice caps, soil, and minerals across the planet. Their conclusion was definitive: even if humanity managed to mobilize every accessible source of the gas, the resulting atmospheric pressure would reach only about 7 per cent of Earth’s, falling far short of what is required to warm the planet meaningfully. Most of that carbon dioxide remains trapped in geological forms that current engineering cannot reach, proving that terraforming is impossible with present-day technology.
From Science Fiction Ventures to Corporate Failures
While researchers study atmospheric limits, commercial efforts to jump-start off-world settlement have met severe financial hurdles.
The enterprise intended to fund its multi-billion-dollar roadmap partly through an Indiegogo fundraising campaign—which rather embarrassingly failed to hit its $400,000 target—and by selling broadcast rights for a decade-long astronaut training program structured as a reality television show. Despite open calls that attracted numerous expressions of interest and a little under 3,000 formal applications, the underlying financial model faltered without securing major television deals or alternate revenue streams. The organization ultimately filed for bankruptcy in 2019.
Engineering Habitats for a Hostile World
With terraforming off the table and commercial reality TV schemes collapsing, sustainable human presence on Mars must rely entirely on sealed infrastructure. Livability for the foreseeable future means living underground or inside pressurised habitats shielded against radiation by thick layers of Martian soil.
Some vital resources are locally accessible. Subsurface water ice can be mined to supply drinking water, oxygen, and rocket propellant, while Perseverance rover trials have already demonstrated small-scale processing of the thin carbon dioxide atmosphere into breathable oxygen according to space-focused reporting. Furthermore, Mars offers manageable sunlight exposure that makes solar power generation far more viable than it is on outer planets or distant moons.
The Unresolved Biological Unknowns
Even if engineers successfully construct radiation-proof habitats and automated life-support systems, profound medical questions remain unanswered. Science possesses decades of data concerning human health in normal Earth gravity and zero-gravity orbital environments, but essentially nothing in between.
Researchers do not yet know whether humans can remain healthy for years under 38 per cent gravity, nor whether children could be raised safely in such conditions. Long-term radiation exposure, chronic contact with toxic dust, and the psychological strain of permanent confinement on a dead world represent open scientific frontiers that cannot be resolved by robotic rovers alone.
