The Case for Humans Terraforming and Colonizing Mars
NASA scientists are studying methods of survival for humans on Mars for planned colonization of the planet.
With an environment that’s hostile to human life, we recognize these issues:
- We need to protect ourselves from cosmic rays since there is no protection as we have on Earth.
- Mars has a different atmosphere that is not favorable to humans.
- Mars has a weaker gravity that will affect how we move around.
This article is a discussion of the questions people ask about this mission. I’ll review the answers we already know.
Initial Considerations for Humans to Survive on Mars
The initial goal is to determine if Mars can support human life. We need to consider two things:
- How will humans handle the Mars environment?
- How will we get the resources to build communities on Mars?
Robotic missions with rovers found raw materials that we could use to construct communities so that we would not need to send these raw materials from Earth.
Mars is the most Earthlike planet in our Solar System, so it’s the best candidate for colonization. Over three billion years ago, it was more like Earth is today, with life-supporting flowing water and a cosmic ray protective magnetic field.
The planet lost both of these since then, but scientists have hope of terraforming Mars to bring it back to a human habitable condition, as I will discuss.
With the upcoming planned missions beginning in 2022, we may be able to start the long process of bringing some of the Earthlike environmental attributes back to the planet. The other issues, such as the danger of cosmic radiation, can be dealt with by other means.
Is There Water on Mars?
Water is vital for life, and therefore this is the utmost concern if we were to inhabit the planet.
Recent developments have provided the answer. NASA has discovered water on the planet that could help sustain human life, but most of it is in the form of ice. It’s on the surface only at the northern pole of Mars.
Smaller amounts are available elsewhere as atmospheric water vapor, and even less exists in the Martian soil.1
Does Mars Have a Protective Magnetic Field?
We know that our survival on Earth is possible for many reasons. One of which is because we have a magnetosphere that diverts the dangerous solar particles and cosmic rays to the poles—away from inhabited areas on Earth.
Their entry into the atmosphere causes the Aurora Borealis (northern lights) and Aurora Australis (southern lights).
The magnetosphere is a magnetic field that exists because our planet has a metallic core. But what about Mars?
Mars had a magnetic field once. It was lost over 3.7 billion years ago, possibly due to multiple asteroid strikes that destroyed the dynamo effect of the planet’s internal magnetic core.2
That means we would need some other method to protect us from cosmic rays that are bombarding the planet.
The fact is that we would never be able to enjoy a day outside without protective suits. Even if there were an atmosphere, we still couldn’t go out without protection as we do on Earth.
All our daily activities would need to be inside buildings that protect us from cosmic rays while living on Mars. Possibly even building underground living quarters would be mandatory.
Does Mars Have an Atmosphere?
Mars does have an atmosphere, but it is very different from our atmosphere on Earth, as shown in the table below.
Nitrogen (N): 78%
Carbon Dioxide (CO^2): 95.32%
Oxygen (O): 21%
Argon (Ar): 1.9%
Argon = (Ar): 0.93%
Nitrogen (N): 2.7%
Carbon Dioxide (CO^2): 0.04%
Oxygen (O): 0.13%
Neon (Ne): 0.001818%
Carbon Monoxide (CO): 0.08%
Helium (He): 0.000524%
Sulfur Dioxide (S): Trace amount
Methane (CH4): 0.000179%
Methane (CH4): Trace amount
Other gases: Trace amounts
Other gases: Trace amounts
Can People Breathe on Mars?
The major part of the Earth's atmosphere that we breathe is 78% Nitrogen and 21% Oxygen, while the atmosphere on Mars is 95% Carbon Dioxide. That’s great for plants, which absorb Carbon Dioxide for photosynthesis in sunlight to produce oxygen. However, Humans need oxygen to breathe and provide energy to our cells.
Even if we can breathe the air, the chemical makeup that I described above is not conducive to human survival. Besides, the pressure of its atmosphere is so low that water boils at the temperature of the human body. Humans will lose consciousness when exposed at that level—known as the Armstrong Limit.
The atmospheric pressure on Earth at sea level is 14.69 psi. The average pressure on Mars is 0.087 psi. Humans definitely could not survive at this low pressure. We would always have to spend our time in a pressurized environment.3
How Does Gravity on Mars Compare to the Earth?
Gravity on Mars is generally only 38% that on Earth. Therefore, if you weight 170 lbs on Earth, you’d be 65 lbs on Mars.
Gravity is a result of the attraction between masses. The larger the mass of an object, the stronger will be its gravity.
Our Sun's gravity keeps all the planets circling it in our solar system without flying away into the outer limits of the galaxy. The gravitational pull of the planets also holds their moons in orbit.
Since Mars is smaller than Earth, as shown in the image below, its gravity is weaker. You might have seen videos of Neil Armstrong and Buzz Aldrin walk on the Moon on July 20, 1969. Their footing was strange as every step they took sent them hovering for a moment due to the weaker gravity.
That would not be the same when walking on Mars since it's much bigger than our moon. Nevertheless, it still would be very different from the firm footing we’ve developed since learning to walk as toddlers.
Gravitational pull is weaker the higher you go, away from the center of mass. That becomes more mathematically complex on Mars because its southern hemisphere has less mass than its northern hemisphere.4
It’s essential to consider these gravity anomalies when planning to bring equipment and supplies to Mars for future colonization.
How Cold Is Mars?
Since Mars is approximately 142 million miles from the Sun, it’s colder than Earth, which is only 94.47 million miles from the Sun.
The average temperature of Mars is -85° Fahrenheit (-65° Celsius). That is extremely cold for humans. However, when you consider that Venus gets as hot as 867° Fahrenheit (464° Celsius) and Neptune gets as cold as -328° Fahrenheit (-200° Celsius), Mars is within the sweet spot.5 It’s within a range that we can deal with using present-day equipment within the living quarters.
In the summer, the temperature on Mars can warm up to -24° Fahrenheit (-31° Celsius). Still quite cold, but livable.
We still have a lot to learn about the evolutionary history of Mars, and we’ll learn much more when we colonize the planet. We already know that it went through global cooling at least once—bringing it to the state it’s in now.
What Can We Learn From Mars About Global Warming?
Mars has already gone through global cooling. Now, using satellite equipment, NASA has discovered that Mars is going through a warming trend.6
Earth may have the same history. Our vision of global warming is misleading. In the 4.6 billion years of the Earth’s evolution, the human race has only been here 35,000 years, and you and I have been here much less than 100 years. So we haven’t experienced the constant repetition of the Earth freezing, and then warming to the point of global flooding, then back to freezing again.
We are now into the fifth ice age in the present glacial period. But who’s counting? Within and between each glacial period the Earth has repeatedly fluctuated from greenhouse to icehouse.7
Since our lives are in such a short period along the entire timeline of existence, we imagine that the present global warming is the only one that ever happened.
Some people claim we are causing global warming. That’s a nearsighted assumption because the Earth already went through four periods of global warming and global cooling over 4.6 billion years.
We may indeed be responsible for climate change, but polluting the environment has a more immediate effect on our survival.
- We are putting toxins into the air that bring about disease and respiratory ailments.
- We are dumping plastics into our oceans that fish eat, and they become our food—so that we ingest plastic into our bodies.
Is It Possible to Make Mars Habitable for Humans?
I feel that we need to get our own house in order before we can make Mars inhabitable. We haven’t been doing such a great job on Earth, keeping it suitable for our continued existence. Have we? So how can we expect to do the right thing to transform Mars?
Scientists are already examining ways to transform Mars by creating greenhouse gases that could increase the pressure of the atmosphere well above the Armstrong Limit (Which I spoke about earlier).
This process is known as terraforming. It’s still hypothetical, but it would allow for sustainable colonization of Mars by transforming it over time to become more like that of Earth, so it's favorable to humans.
What Is Terraforming, and Is It Possible?
In a 1961 article in the Science Journal, astronomer Carl Sagan proposed an idea to influence the global environment of Venus.8 Scientists are now considering that for Mars, with the process of terraforming the planet by planting trees and other vegetation.
Terraforming would require enough CO2 and water vapor for trees to flourish and bring the oxygen level up to 21% as we have on Earth. Mars’ atmosphere does have 95% CO2 already, so the idea seems feasible.9
Some types of trees may withstand the colder temperatures on Mars. For example, Apple trees are known to grow in cold climates and survive under a blanket of snow. Scientists are already experimenting with growing plants in Mars soil on the International Space Station.10
In addition to planting trees to produce oxygen, which will take hundreds of years before humans can breathe the air, other technologies are available to produce oxygen.
How Can We Make Oxygen on Mars?
An experimental process called solid oxide electrolysis will produce pure oxygen from the carbon dioxide that’s present in the Martian atmosphere. Since there is an abundant 95% supply of CO2 available, this can have significant results.
The experiment is named MOXIE (Mars OXygen In situ resource utilization Experiment).11
It will be implemented as a scale model 1% normal size on a robotic Mars rover planned for launch in 2020 in preparation for the upcoming Mars missions.
How Is NASA Preparing for the Journey to Mars?
Since 2015, NASA has been putting a lot of attention to all the prerequisites necessary for a successful mission.12 They have used robotic pathfinders, such as rovers Spirit and Opportunity, to map the surface of Mars and find destinations for upcoming human missions. These rovers do the following jobs:
- Collect surface samples,
- Conduct seismic investigations,
- Locate potential landing sites,
- Test developed technology systems,
- Select human-accessible landing sites,
- And position required infrastructure.
More recently, NASA has been preparing the following technological tools necessary for the journey to Mars and for supporting humans living on Mars. Costs as minimized by working with innovative partnerships, such as:
- Deep-space atomic clocks for precise navigation,
- Solar electric propulsion with advanced ion thrusters,
- Laser communications for high data rate transmission,
- Entry Defense and Landing (EDL) Systems,
- Nuclear fission for Mars surface power,
- And habitation systems for Mars inhabitants.
Who Is Funding the Mission?
Initially, Mars One offered private funding for a permanent human settlement on Mars. That was a combination of two entities:
- Mars One Foundation: A Dutch non-profit company
- Mars One Ventures: A Swiss publicly-traded company
However, on January 15, 2019, the organization was liquidated and now-defunct based on a court decision due to poor planning of logistics and medical concerns for the inhabitants.13
However, Mars-bound cargo flights are being planned for as early as 2022 with funding by SpaceX (Founded in California by Elon Musk), using their Falcon 9 and Falcon Heavy launcher.
I’m not sure what’s going to happen going forward since the defunct Mars One Foundation was to manage the mission and train the crew. And Mars One Ventures owned the rights to its merchandise, ads, video content, broadcasting rights, and other intellectual property.14
We’ll see what happens by 2020 and beyond. We’ll know soon enough if all this will progress as planned.
Who Would Go to Mars?
The idea of the average person deciding to move to Mars is far fetched, and I don’t think it will ever be a reality. It will also never be considered for casual space travel.
The only people going are those directly related to scientific studies. They would be willing to make a one-way trip to build a community for the future survival of the human race in case the Earth becomes uninhabitable.
Living on Mars will never be similar to that on Earth. A method to protect the human body from cosmic radiation will continue to be a concern, requiring special living quarters and protective suits when venturing outdoors. Possibly underground communities might be the solution.
How Would Humans Colonize Mars?
If all goes well and the mission continues as planned, it will be done in four phases:
- A cargo mission with a robotic lander and orbiter by 2022.
- Transport of a methane/oxygen propellant plant to be assembled on Mars.
- A human crew of four astronauts will follow in 2024 and another in 2026.
- Additional men and women will follow throughout the 2030s.
Construction and colonization plans will continue beyond 2024 to accommodate the growth of a human population.15
It Would Be a Permanent Settlement
The astronauts would not be returning to Earth. Some people in academia call this a suicide mission. However, if they succeed at living out their lives on Mars, I would consider it a relocation plan. The purpose, after all, is a permanent Mars settlement of a human colony.
Those who go will have accepted the fact that they will have no family or friends other than the crew involved in the mission. Survival in case of illness will be dependent on the team that will include a doctor and surgeon.
Robotic surgery can be performed remotely by surgeons on Earth. We have that type of equipment and technology now, such as the “da Vinci Surgical System" used for prostate surgery. The only issue is the 20-minute delay with data transmission. However, that might be solvable with autonomous surgery. That could handle tasks during delays with remote control.16
Considering the Environment
Specific nutrients that are useful for human colonization have also been found. And the existence of liquid water has been confirmed.17
Based on these findings, there is more hope that Mars is a suitable candidate for the development of a colony for human civilization.
Nevertheless, I can think of other concerns that come to mind. We’ve evolved with characteristics conducive to living on Earth. We might have unforeseen health issues living on Mars.
Besides, it would be boring being one of the first to voyage out there, especially before completing terraforming. Imagine being cooped up in a life support capsule for the rest of our days!
Long-Term Plan Not Anytime Soon
All of this is a long-term plan and is not feasible for our near future. Recent studies, as of July 2018, conclude that there is not enough CO2 remaining on Mars for creating greenhouse warming.18
NASA is also admitting that terraforming is not possible with our present technology.19
Besides, it's not a plan to be accomplished in a single human lifetime. That's not the idea. The goal is to develop a place for the human race to survive if the Earth should become uninhabitable.
That could happen by our destructive tendencies or by external forces such as a meteor collision. Even though it doesn't seem possible at present, it's a long-range goal that will take thousands of years to reach its full potential.
Would you go to Mars to settle there for the rest of your life if given the opportunity?
- Water on Mars - Wikipedia
- Lisa Grossman. (Jan 20, 2011). "Multiple Asteroid Strikes May Have Killed Mars's Magnetic Field." Wired.com
- Atmosphere of Mars - Wikipedia
- Gravity of Mars - Wikipedia
- Planetary Fact Sheet. NASA.gov
- Ruth Marlaire. (May 14, 2007). "A Gloomy Mars Warms Up." NASA.gov
- Greenhouse and icehouse Earth - Wikipedia
- Carl Sagan. (March 1961). "The Planet Venus". Science, Volume 133, Issue 3456, pp. 849-858
- Terraforming of Mars - Wikipedia
- Gary Jordan. (August 7, 2017). "Can Plants Grow with Mars Soil?" NASA.gov
- Mars Oxygen ISRU Experiment - Wikipedia
- Journey to Mars. (October 8, 2015). NASA.gov
- Mars One - Wikipedia
- About Mars One. www.mars-one.com
- Colonization of Mars - Wikipedia
- Meera Senthilingam. (May 12, 2016). “Would you let a robot perform your surgery by itself?” CNN.com
- Life on Mars - Wikipedia
- Bruce M. Jakosky and Christopher S. Edwards. (July 30, 2018). “Inventory of CO2 available for terraforming Mars.” Nature Astronomy
- Bill Steigerwald and Nancy Jones. (July 30, 2018). “Mars Terraforming Not Possible Using Present-Day Technology” - NASA.gov
Questions & Answers
© 2019 Glenn Stok