We have covered the ISS in moss with a single objective. And now the possibility of “terraforming” Mars is closer

Last year, scientists published the results of a study in which they told how they had covered the outside of the International Space Station (ISS) with moss. Although the study It was published in Decemberit was not a Christmas decorative strategy. They wanted to check if this primitive plant is capable of surviving the inhospitable conditions of space. The results were so positive, they could take humanity one step closer to terraforming Mars.

A primitive plant to start a new life. The first plants that appeared on Earth were bryophytes, more specifically mosses. They are very resistant plants, capable of growing directly on rocks. From there, they can photosynthesize if they have the right water and nutrients. It is a process in which they capture carbon dioxide from the atmosphere and generate oxygen. In addition, they generate organic matter that, upon death, becomes the perfect substrate. so that other more complex plants can grow.

That is why the study was carried out to see if moss can survive in space. It was proven yes, so it could be an interesting candidate for terraforming Mars or the Moon.

The study. Basically, what was seen in the study is that the mosses exposed on the outside of the ISS were able to survive for 283 days exposed to extremely cold temperatures and very intense ultraviolet radiation. When they were returned to Earth after that period, more than 80% had survived. In fact, planting them made them germinate.

Carl Sagan already predicted it (more or less). The dream of terraforming other planets is not something new, although it is true that for a long time it was almost a fantasy. In 1961, for example, Carl Sagan made an interesting proposal to terraform Venus. It is known that this planet neighboring Earth It is covered by a dense layer of clouds. Since clouds here on Earth are usually made of water, the famous astrophysicist proposed planting cyanobacteria inside them. These microorganisms have the ability to carry out photosynthesis, like plants. Therefore, they could consume carbon dioxide and generate oxygen.

The problem is that it was later discovered that the clouds of Venus are actually made of sulfuric acid, so their proposal became unattainable.

Proposals to terraform Mars. No further proposals have been made to terraform Venus, but there have been proposals to do the same with Mars. It’s also pretty inhospitable, but it has a lot more potential. In fact, last year was published in Nature a study that talked about the possibility of turning the red planet into something similar to Earth with only four steps. The first would be to melt the ice, so that it becomes an immense ocean of liquid water. For this, the temperature would have to be increased by at least 30ºC.

heat is needed. The second step, therefore, is to obtain that heat. It was proposed to use solar sails that direct most of the solar radiation to these ice reserves. Aerosols could also be dispersed in the atmosphere that cause a kind of greenhouse effect, further retaining solar radiation inside the planet.

A vaulted habitat. Although Mars has its own atmosphere, it would have to be reinforced with something that would allow it to create a biosphere. Therefore, it would be interesting to build vaults into which to introduce the first Martian inhabitants.

Life that brings more life to Mars. Finally, it would be necessary to use genetically modified-extremophilic microorganisms. These are microorganisms capable of surviving in extreme conditions. For example, microorganisms that survive in media with high salt concentrations or very high or very low temperatures are Extremophiles. Even so, it would be necessary to genetically modify them to make them even more resistant to extremely low temperature and pressure conditions. These microorganisms would be photosynthetic, so that they generate oxygen and organic matter.

Moss comes into play. Following the results of the International Space Station experiment, it is clear that moss could be a good complement to these extremophile microorganisms to terraform Mars. Unfortunately, it is estimated that to have the technologies necessary to meet all the requirements we will have to wait at least 100 years. It’s a long time, but with everything humanity has waited for, it would only be a little longer. For now, as the road safety advertisements say, the important thing is to arrive. There are already space agencies trying to date that first step. Let’s start there.

Image | Julius A OBARO (Wikimedia Commons) and Freepik

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