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Although Mars may once have been warm and wet, the red planet today is a frozen wasteland. Most scientists agree that it’s highly unlikely that any living creature, even a microbe, could survive for long on the very surface of the planet.

When the first humans travel to Mars to explore the red planet up close, they will have to grow their food in airtight, heated greenhouses. The Martian atmosphere is far too cold and dry for edible plants to grow in the open air. But if humans ever hope to establish long-term colonies on their planetary neighbor, they will no doubt want to find a way to farm outdoors. Imre Friedmann has an idea of how they might take the first step.

Friedmann is a microbiologist who recently joined the NASA Astrobiology Institute team at NASA’s Ames Research Center. Friedmann was one of the invited speakers at a NASA-sponsored conference, “The Physics and Biology of Making Mars Habitable,” held at Ames in October 2000. His talk focused on an organism that could be used to begin the process of converting the Martian surface into arable soil.

Mars is covered by a layer of ground-up rock and fine dust, known as regolith. To convert regolith into soil, it will be necessary to add organic matter, much as organic farmers on Earth fertilize their soil by adding compost to it.

On Earth, compost is made up primarily of decayed vegetable matter. Microorganisms play an important role in breaking down dead plants, recycling their nutrients back into the soil so that living plants can reuse them. But on Mars, says Friedmann, where there is no vegetation to decay, the dead bodies of the microorganisms themselves will provide the organic matter needed to build up the soil.

The trick is finding the right microbe. “Among the organisms that are known today,” says Friedmann, “Chroococcidiopsis is most suitable” for the task. Chroococcidiopsis is one of the most primitive cyanobacteria known. Chroococcidiopsis is present in the most extremely arid desert microbial habitats, where no other cyanobacteria can exist.

What makes Chroococcidiopsis such a good candidate is its ability to survive in a wide range of extreme environments that are hostile to most other forms of life. Chroococcidiopsis has been found growing in hot springs, in hypersaline habitats, in a number of hot, arid deserts throughout the world, and in the frigid Ross Desert in Antarctica. “Chroococcidiopsis is the constantly appearing organism,” Friedmann points out, “in nearly all extreme environments – at least extreme dry, extreme cold, and extremely salty environments. This is the one which always comes up.”

Moreover, where Chroococcidiopsis survives, it is often the only living thing that does. But it gladly gives up its dominance when conditions enable other, more complex forms of life to thrive.

For clues on how to farm Chroococcidiopsis on Mars, Friedmann looks to its growth habits in arid regions on Earth. In desert environments, Chroococcidiopsis grows either inside porous rocks (endolithic growth), or just underground, on the lower surfaces of translucent pebbles (hypolithic growth).

The pebbles provide an ideal microenvironment for Chroococcidiopsis in two ways. First, they trap moisture underneath them. Experiments have shown that small amounts of moisture can cling to the undersurfaces of rocks for weeks after their above-ground surfaces have dried out. Second, because the pebbles are translucent, they allow just enough light to reach the organisms to sustain growth.

Friedmann envisions large farms where the bacteria are cultured on the underside of strips of glass that are treated to achieve the proper light-transmission characteristics. Mars today, however, is too cold for this technique to work effectively. Before even as hardy a microbe as Chroococcidiopsis could be farmed on Mars, the planet would have to be warmed up considerably, to just below the freezing point. That process could take hundreds of years.

What Next?

Friedmann admits that his ideas about growing Chroococcidiopsis are, at this point, merely a thought experiment. “I don’t think any of us alive today will see this happen,” he muses. Neither NASA nor any other space agency has plans even to send humans to explore the red planet, let alone to begin the process of terraforming it.

“When the time does come” to begin the process of terraforming Mars, he explains, “say, 50 years from now, the technology will be so different that everything that we are planning today, with today’s technology, will be ridiculously outdated.” Friedmann fully expects that by that time “genetic engineering will have developed to the point that we can produce designer organisms” to do the job. Even if Chroococcidiopsis is ultimately used “as the basis, it will be a vastly improved version of today’s Chroococcidiopsis.