How introducing microbial life to Mars can make it livable for humans

In order to build a second Earth, we need to look at how the first one was made.

  • Humanity dreams of becoming an interplanetary species, but no other planet in our solar system can currently support complex life.
  • In order to make a planet like Mars hospitable for us, we'll have to engage in a massive, decades-long terraforming effort.
  • Much of what makes Earth livable, such as breathable air, tolerable temperatures, and so on, are the result of microbial activity from Earth's early history. Can we use microbial life to make the same changes on Mars?

Three billion years ago, Earth would not have been all that pleasant for humans. It was covered in active volcanoes, spewing out carbon dioxide and water vapor. Single-celled life scraped by on a diet of sulfur. Most of the atmosphere consisted of carbon dioxide, methane, and other greenhouse gases, leaving the air toxic for us and most other modern life on Earth.

Then, about 2 and a half billion years ago, something happened. With what amounts to a snap of the fingers in geologic timescales, the atmosphere was pumped full of oxygen in what we call the Great Oxygenation Event. The abundance of oxygen meant that new, more diverse kinds of life could take a hold on the young planet, such as Eukaryotes. Fast-forward a few billion years, and complicated, multicellular life like ourselves are walking around the planet.

So where did all of this oxygen come from? Today, we think that nearly all of the oxygen on Earth came from cyanobacteria, tiny, blue-green, single-celled life that had the innovative idea of using sunlight to bake water and carbon dioxide into sugar for energy — that is, photosynthesis. Unfortunately for the cyanobacteria, photosynthesis makes the unappealing byproduct of oxygen, which they throw away into their environment.

Every breathe we take, we owe to cyanobacteria, and this influx of oxygen into our environment is ultimately responsible for why modern Earth is so accommodating to life. But what Earth giveth, Earth also taketh away. Whether it's because of climate change, nuclear war, a global pandemic, or some unknown catastrophe, eventually we'll want a new home. But our closest, best hope for a new home — Mars — doesn't have any oxygen.

It doesn't have much of an atmosphere at all, really.

This said, scientists are hoping to recreate the Great Oxygenation Event on Mars much in the same way it happened on Earth; by using microbial life to build the environment for us.

Terraforming Mars with microbes

Wikimedia Commons

An artist's depiction of a Martian terraforming effort's progression.

While Mars might be different from early Earth in many ways, it does possess some key characteristics that could make a microbial terraforming project work. Mars has an atmosphere that's 95 percent carbon dioxide, which provides half of the ingredients needed for cyanobacteria to make oxygen. The other ingredient, water, is admittedly scarce on the Red Planet, but we've seen evidence that it exists. We know that ice is abundant in the poles, so much so that if we were to melt them, Mars would be covered in an 18-foot-deep ocean.

There's already some liquid water that exists on Mars, to be sure — just in very scant amounts. We've seen features on Mars called recurring slope lineae, which are dark lines that advance down the sides of hills during the Martian summer and fade away during the winter. These dark lines are thought to be flows of water that come and go with the seasons.

NASA

This image of the side of a Martian crater shows recurring slope lineae. The dark lines descending from the slope of the crater come and go with the seasons, which may indicate flowing water.

So, to terraform Mars, we would start with areas where we know liquid water exists and dump a lot of cyanobacteria there. Admittedly, it would be a bit more of a sophisticated operation than that makes it sound, but that's the gist of the idea. We would also want to include microbes that produce greenhouse gases.

Mars has the opposite problem as Earth; we want to make Mars hotter and thicken its atmosphere, so its polar ice can melt. More water means more opportunities for microbial life to do its work. Not to mention that the current climate on Mars is much too chilly for even the hardiest human — it averages at about minus 81 degrees Fahrenheit, although the temperature can vary wildly.

The idea of using microbes to kickstart a terraforming project on Mars is so promising that NASA has already begun preliminary tests. The Mars Ecopoiesis Test Bed is a proposal for a device to be included with future robotic missions to Mars. It would look something like a drill with a hallow chamber inside. The drill would bury itself in the Martian soil, preferably somewhere with liquid water. A container full of cyanobacteria would be released into the chamber, and sensors would detect whether the microbial life produce any oxygen or other byproducts.

The first phase of this project was conducted in a simulated Martian environment here on Earth, and the results were positive. But even still, there are some major challenges we'll have to meet if we want to use microbially terraform Mars on a large-scale.

Challenges

NASA

The Mars Ecopoiesis Test Bed.

Mars lacks something very necessary for life-giving planets: a magnetosphere. Mars used to have a magnetic field that protected the planet. We've found magnetized rocks on the surface indicating that this was the case, but at some point, the magnetic field just disappeared, and we don't know for certain what happened. Without a magnetosphere, the planet's surface is bombarded by solar radiation, which will make larger, more complex life difficult to sustain.

This "solar wind" also blows away the Martian atmosphere. So, even if we do coax microbial life into producing oxygen and other gasses, much of it will simply float away into space.

Wikimedia Commons

These images show different elements escaping from the Martian atmosphere. From left to right, the images show carbon, oxygen, and hydrogen floating away to space.

Fortunately, these challenges are not insurmountable. In the short term, we'll likely construct dome-like habitats to protect both us, our cyanobacteria, and our new atmosphere from the solar wind. In the long term, NASA scientists have proposed placing a powerful magnet in fixed orbit between Mars and the Sun. This magnet will redirect the solar wind, shielding the Martian atmosphere. As microbial life continues to output oxygen and greenhouse gases into the Martian atmosphere, the planet will warm up, the ice caps will melt into oceans, and Mars may very well become our second home.


Should you defend the free speech rights of neo-Nazis?

Former president of the ACLU Nadine Strossen discusses whether our society should always defend free speech rights, even for groups who would oppose such rights.

Sponsored by Charles Koch Foundation
  • Former ACLU president Nadine Strossen understands that protecting free speech rights isn't always a straightforward proposition.
  • In this video, Strossen describes the reasoning behind why the ACLU defended the free speech rights of neo-Nazis in Skokie, Illinois, 1977.
  • The opinions expressed in this video do not necessarily reflect the views of the Charles Koch Foundation, which encourages the expression of diverse viewpoints within a culture of civil discourse and mutual respect.
Keep reading Show less

Harness the Power of Calm

Tap into the "Rest and Digest" System to Achieve Your Goals

Big Think Edge
  • In the fast-paced workplaces and productivity-focused societies many of us inhabit today, it is easy to burnout.
  • Emma Seppälä, a Stanford researcher on human happiness, recommends tapping into the parasympathetic nervous system instead—"rest and digest"rather than "fight or flight."
  • Aiming for energy management rather than time management will give you the resilience you need to excel at the things that really matter in your life and career, rather than living "mostly off" by attempting to seem "always on."

Apple co-founder says we should all ditch Facebook — permanently

Steve Wozniak doesn't know if his phone is listening, but he's minimizing risks.

Photo by Bryan Steffy/Getty Images
Technology & Innovation
  • Steve Wozniak didn't hold back his feelings about the social media giant when stopped at an airport.
  • The Apple co-founder admitted that devices spying on his conversations is worrisome.
  • Wozniak deleted his Facebook account last year, recommending that "most people" should do the same.
Keep reading Show less

Where the evidence of fake news is really hiding

When it comes to sniffing out whether a source is credible or not, even journalists can sometimes take the wrong approach.

Sponsored by Charles Koch Foundation
  • We all think that we're competent consumers of news media, but the research shows that even journalists struggle with identifying fact from fiction.
  • When judging whether a piece of media is true or not, most of us focus too much on the source itself. Knowledge has a context, and it's important to look at that context when trying to validate a source.
  • The opinions expressed in this video do not necessarily reflect the views of the Charles Koch Foundation, which encourages the expression of diverse viewpoints within a culture of civil discourse and mutual respect.
Keep reading Show less