Can We Terraform Mars? What the CO2 Numbers and Aerogel Say

Can we terraform Mars? It is one of the most searched questions in space, and the honest answer is: not with any technology we have today, and maybe not with the carbon dioxide that Mars holds on its own. That does not mean people will never live there. It means the realistic path looks less like a green planet and more like a series of sealed, warmed, protected places. Here is what the science says.

What does terraforming Mars actually mean?

Terraforming means changing a planet's environment on a large scale so that humans could live on its surface without pressure suits. For Mars, that would require roughly three things:

• A much thicker atmosphere, so that water stays liquid and people do not need a pressurized suit.
• Higher temperatures. Mars averages about minus 60 degrees Celsius.
• Breathable oxygen, which Mars's carbon dioxide air does not provide.

Today the Martian surface pressure is under 1 percent of Earth's (around 6 millibars, compared with about 1,013 on Earth). At that pressure, liquid water boils away or freezes almost immediately.

How much CO2 is on Mars?

The most cited answer comes from a 2018 paper in Nature Astronomy by Bruce Jakosky and Christopher Edwards, "Inventory of CO2 available for terraforming Mars." They combined about two decades of data from NASA's MAVEN, Mars Reconnaissance Orbiter and Odyssey missions and ESA's Mars Express.

Their conclusion: even if you released all the CO2 that is reasonably accessible, you would fall far short of the pressure needed for a warm planet. Reported figures vary between summaries, but the polar caps and the thin soil and mineral stores would add only a small fraction of Earth's atmospheric pressure, by their estimate. Warming Mars enough for stable liquid water would need something like an Earth-sized atmosphere's worth of CO2.

There is a counterargument. Robert Zubrin, a long-time Mars advocate, has argued that soil may hold more adsorbed CO2 than the paper assumed, enough for a few hundred millibars. The paper's authors responded that most of the CO2 is not readily accessible. The debate is not fully settled, but even the optimistic view reaches a thin atmosphere you would still need a breathing apparatus for.

What about nuking the poles or importing gas?

Popular ideas include detonating nuclear devices over the ice caps or redirecting comets and asteroids that carry volatiles. These are worth discussing, but be careful with the claims:

1. The 2018 study looked at what is available on Mars today, not at imported material.
2. Delivering enough volatiles from the outer solar system would be a project on a scale far beyond anything built so far.
3. Mars has no global magnetic field, so a thicker atmosphere would still be slowly stripped by the solar wind over very long timescales.

None of these are proven to work. They are open engineering and physics questions.

The aerogel idea: warming small regions instead

A more modest proposal came in 2019. Robin Wordsworth of Harvard, Laura Kerber of NASA JPL and Charles Cockell of the University of Edinburgh published a study in Nature Astronomy on silica aerogel, an extremely light, transparent insulating solid.

Their experiments found that a layer of aerogel about 2 to 3 centimeters thick could warm the ground beneath it to the melting point of water under Mars-like sunlight, using a solid-state greenhouse effect. The aerogel also blocked most harmful ultraviolet light in their measurements. The team described this as a regional approach, not planetary terraforming. Outside experts called it promising but unresolved.

So how long would it take, and will it happen?

No credible timeline exists. If global terraforming is possible at all, the number is centuries to millennia, and it depends on technology that has not been invented. A far nearer goal is making small areas of Mars livable, shielded from radiation and warm enough to grow food. That fits what we already do in Antarctica or on the International Space Station, only farther away.

Where Frontier fits

Frontier (https://thefrontier.space/) is a community-funded project that starts with asteroid resources, then looks toward Mars and Titan. The terraforming debate shows why: any serious settlement of Mars needs water, metals, and volatiles in large quantities, and asteroids are one of the few places to get them without gravity wells. Frontier is built in public, uses a fixed-supply token (FRNT on Base), and holds its treasury in a multisig, so the community can follow how funds are used. We think the sensible order is resources first, settlements second.

Frequently asked questions

Can we terraform Mars with current technology? No. Studies suggest Mars does not hold enough accessible CO2 to thicken the atmosphere meaningfully, and we have no proven method to import the difference.

How long would it take to terraform Mars? There is no reliable estimate. Most scientists who discuss it talk about centuries or longer, and only if new technology emerges.

Is the Mars atmosphere breathable? No. It is mostly carbon dioxide at under 1 percent of Earth's surface pressure, with very little oxygen.

What is the most realistic way to live on Mars? Sealed habitats, possibly buried or shielded from radiation, with local ice used for water and possibly aerogel or greenhouse structures to create warmer, protected zones.

Sources: Jakosky and Edwards, Nature Astronomy (2018); Wordsworth, Kerber and Cockell, Nature Astronomy (2019); Harvard Gazette coverage.