Space Exploration & Planetary Science

Mars Terraforming Is No Longer Science Fiction — New Technology Makes It a Real Research Question

For decades, the idea of reshaping Mars into a living planet lived in the pages of novels and the margins of conference talks. Now a growing number of scientists say it is time to take the question seriously.

• A workshop summary prepared for the 2025 Green Mars Workshop argues that SpaceX's Starship, synthetic biology, and advanced climate models have reduced the cost and complexity of terraforming to the point where it is a legitimate scientific research topic — not a fantasy.
• The proposed roadmap has three stages: warming Mars by tens of degrees using engineered aerosols, introducing extremophile microbes to begin oxygen production, and eventually building a breathable atmosphere — a process that could take centuries.
• Raising Mars's temperature by roughly 30°C could melt frozen water reserves sufficient to create an ocean covering nearly 4 million square kilometers at an average depth of 300 meters.

Terraforming — the process of deliberately altering a planet's atmosphere, temperature, and surface to make it habitable for Earth life — has been a staple of science fiction for generations. The vision of a green Mars with flowing water, breathable air, and forests has inspired countless stories, but it has also been dismissed by most scientists as a distant dream far beyond our capabilities. A new report challenges that assumption head-on.

Dr. Erika DeBenedictis, CEO of Pioneer Labs and author of the workshop summary, argues that the technological landscape has shifted dramatically. "Thirty years ago, terraforming Mars wasn't just hard — it was impossible," she told Space.com. "But new technology like Starship and synthetic biology have now made it a real possibility." The summary was prepared for the 2025 Green Mars Workshop and argues that the question is no longer whether terraforming is physically possible, but whether humanity should pursue it and what the safest path would look like.

The proposed roadmap begins with warming the planet. Researchers envision using engineered aerosols or greenhouse gases to raise Mars's average surface temperature by several tens of degrees over a few decades. Mars is known to hold vast reserves of frozen water — enough to cover nearly 4 million square kilometers to a depth of about 300 meters if melted. Once temperatures rise by roughly 30°C, that ice would begin to thaw, and stable liquid water could appear on the surface for the first time in billions of years.

The second stage involves introducing engineered extremophiles — microbes designed to survive Mars's cold, radiation-soaked, low-pressure environment. These organisms would spread across the planet in algae-like layers, using photosynthesis to slowly convert carbon dioxide into oxygen. The third stage, building a breathable atmosphere, would take the longest: researchers estimate that natural oxygen production alone would require roughly a thousand years. The early phase of habitation would likely take place inside enormous domed habitats about 100 meters tall, where oxygen could be produced through electrolysis or controlled photosynthesis.

The report also highlights major unknowns. Scientists still do not fully understand what lies beneath Mars's ice sheets, how dust storms would behave in a warmer climate, or whether the planet contains enough raw materials for large-scale oxygen production. And beyond the science lie profound ethical questions — if Mars already harbors its own microbial life, do humans have the right to reshape an entire world?