A beginner-friendly guide to the Red Planet, the obstacles ahead, and the ideas that might one day make it home
Look up on a clear night and you might spot a small, steady, reddish light. That’s Mars, our nearest planetary neighbor (besides Venus) and the world people have dreamed about for more than a century. Science fiction has sent heroes there, stranded botanists on it, and built whole civilizations beneath its dusty sky.
But here’s the real question: could actual humans live there? Not just visit for a few weeks, but build homes, grow food, raise families, and stay?
The honest answer is maybe, but it’s extremely hard. The good news is that you don’t need a science degree to understand why. In this guide, we’ll walk through what Mars is really like, the biggest challenges of living there, and the exciting possibilities scientists and engineers are exploring. Whether you’re simply curious or just starting to explore space science, this is a friendly place to begin.
Why Do People Want to Go to Mars?
Before we dive into the difficulties, it helps to understand why Mars is such a popular target. After all, there are other planets and moons in our solar system. Why not pick one of those?
The answer is that Mars is the least bad option. Here’s why it stands out:
- It has a solid surface. Unlike gas giants such as Jupiter and Saturn, Mars has ground you can land on and build upon.
- A day feels familiar. A Martian day, called a “sol,” lasts about 24 hours and 37 minutes, remarkably close to ours.
- It has seasons. Mars is tilted on its axis much like Earth, so it experiences spring, summer, autumn, and winter, though each lasts longer because a Martian year is about 687 Earth days.
- It once had water. Satellites and rovers have found strong evidence of ancient rivers, lakes, and possibly even an ocean. Today, there’s still plenty of frozen water at the poles and underground.
- It’s reachable. Compared to most other worlds, Mars is within range of the spacecraft we can build now or in the near future.
There are also bigger motivations. Scientists want to know whether life ever existed on Mars, which could change our understanding of our place in the universe. Others see a self-sustaining Mars settlement as a kind of “backup” for humanity, a second home in case something ever goes wrong on Earth. And, of course, exploration itself is part of who we are. People have always wanted to see what’s over the next horizon.
What Is Mars Actually Like?
To understand the challenges, we first need an honest picture of the place. Mars is not a cozy, slightly colder version of Earth. It’s a cold, dry, dusty desert world, and it is far less welcoming than the most extreme places on our own planet.
It’s freezing. The average temperature on Mars is around -60°C (-80°F). Near the equator on a summer afternoon it can reach a comfortable-sounding 20°C (about 70°F), but at night temperatures can plunge below -70°C (-100°F). At the poles in winter, it’s colder still.
The air is thin and unbreathable. Mars’s atmosphere is about 95% carbon dioxide, and it’s incredibly thin, with a pressure less than 1% of Earth’s at sea level. If you stood on Mars without a spacesuit, you wouldn’t just struggle to breathe. The low pressure would be dangerous in itself, and there simply isn’t any usable oxygen.
Gravity is weaker. Mars has about 38% of Earth’s gravity. You could jump much higher there, but as we’ll see, long-term low gravity may be hard on the human body.
It’s dusty and dry. Mars is covered in fine reddish dust, and the planet sometimes experiences huge dust storms that can blanket entire regions for weeks. The soil also contains chemicals called perchlorates, which are toxic to humans in large amounts.
There’s almost no protection from space. Earth has a thick atmosphere and a strong magnetic field that shield us from harmful radiation. Mars has lost most of its atmosphere over billions of years and has no global magnetic field, so its surface is much more exposed.
None of this makes Mars impossible. It does mean that anyone living there would need to carry nearly everything required for survival with them, or learn to make it from what’s available.
Challenge #1: Simply Getting There
Even before we think about living on Mars, we have to talk about the journey.
Mars and Earth orbit the Sun at different speeds, so the distance between them is always changing, from roughly 55 million kilometers (34 million miles) at the closest to over 400 million kilometers (250 million miles) at the farthest. To save fuel, spacecraft launch during special “windows” that open about every 26 months, when the two planets are favorably lined up.
Even then, a trip takes roughly six to nine months with current technology. That’s a long time to spend in a small spacecraft. Everything the crew needs, including food, water, air, medicine, and spare parts, must either be carried along or recycled with extreme efficiency.
Landing is another hurdle. Mars’s atmosphere is too thin for parachutes alone to slow a heavy spacecraft, but thick enough to cause dangerous heating and stress during entry. Engineers call the final minutes of a Mars landing “the seven minutes of terror,” because the spacecraft must slow from thousands of kilometers per hour to a gentle touchdown, all automatically. So far, we’ve managed to land small and medium-sized robots this way. Landing the much heavier equipment and habitats that humans would need is a major unsolved engineering challenge, though many teams are working on it.
And there’s a communication delay. Radio signals take between about 3 and 22 minutes to travel one way between Earth and Mars, depending on where the planets are. That means no real-time conversations. If something goes wrong, the crew can’t wait for instructions from mission control. They’ll need to be skilled, self-reliant problem-solvers.
Challenge #2: Radiation
If there’s one challenge that space experts mention again and again, it’s radiation.
On Earth, we’re protected by our atmosphere and magnetic field. In deep space and on the Martian surface, that protection is mostly missing. Astronauts would be exposed to cosmic rays (high-energy particles from beyond our solar system) and bursts of radiation from the Sun called solar flares.
Instruments on NASA’s Curiosity rover, which traveled to Mars and then measured the surface environment, have helped scientists estimate how much radiation a crew might receive. A round trip plus time on the surface could add up to a dose well above what most people on Earth ever experience, raising long-term risks such as cancer and possible effects on the nervous system.
The good news is that radiation is a problem we know how to address, at least in part. Possible solutions include:
- Shielding in spacecraft, using materials like water, plastics, or even stored supplies placed around the crew’s living area.
- Storm shelters where astronauts can hide during intense solar flares.
- Building underground on Mars, since just a few meters of soil or rock can block much of the radiation. Natural lava tubes, which are caves formed by ancient volcanic activity, might offer ready-made shelters.
- Faster travel, since less time in space means less exposure.
Radiation is a serious challenge, but it’s one with realistic paths forward.
Challenge #3: Air to Breathe
Since Mars’s atmosphere is mostly carbon dioxide, settlers would need to create a breathable environment inside sealed habitats and make oxygen themselves.
Here, scientists have already had a real success. In 2021, an experiment called MOXIE aboard NASA’s Perseverance rover successfully produced small amounts of oxygen from Mars’s carbon dioxide-rich air. It was a tiny, proof-of-concept machine, but it showed something important: we can make oxygen on Mars.
Scaling this up would be a major task, and habitats would need to be airtight, pressurized, and reliable. A single leak or equipment failure could be life-threatening. Engineers would need systems for removing carbon dioxide, controlling humidity, and cleaning the air, all while running continuously for years with minimal repairs.
Challenge #4: Water and Food
Humans can survive about three days without water and a few weeks without food, so both are essential.
Water is one area where Mars offers some hope. There’s a lot of water ice at the poles, and evidence suggests there’s ice buried beneath the surface at lower latitudes too. Future settlers could mine that ice, melt it, and purify it for drinking, farming, and even making rocket fuel. Locating and reaching the best sources is a key part of choosing where to land.
Food is trickier. Shipping all food from Earth would be expensive and wouldn’t work for a permanent settlement, so Mars residents would eventually need to grow their own. But Martian soil isn’t ready-made farmland. It lacks the organic material that supports plant life on Earth, and its perchlorates would need to be washed out or neutralized.
Researchers are exploring several approaches:
- Hydroponics, growing plants in nutrient-rich water instead of soil.
- Greenhouses with artificial light, controlled temperature, and added carbon dioxide.
- Improving the soil by adding nutrients, bacteria, and compost.
- Choosing hardy crops like potatoes, lettuce, radishes, and beans, many of which have already been tested in space or in simulated Martian soil on Earth.
Growing food on Mars wouldn’t just feed people. Plants also help refresh the air and can boost morale, a surprisingly important factor, as we’ll see below.
Challenge #5: What Low Gravity Does to the Body
Mars’s gravity is about 38% of Earth’s. That might sound pleasant, but the human body evolved under Earth’s gravity, and it depends on it more than we realize.
We’ve learned a lot from astronauts who’ve spent months aboard the International Space Station, where there’s almost no gravity at all. In that environment, muscles weaken, bones lose density, and fluids shift toward the head, which can affect eyesight. Astronauts exercise for around two hours a day to slow these effects, and they still need time to recover when they return home.
What we don’t know is exactly how the body would respond to living in 38% gravity for years. No human has ever experienced it for more than a few moments. Would it be enough to keep bones and muscles healthy? Could children grow up normally? Would pregnancy be safe? These are open questions, and answering them will take research, possibly including experiments with animals on the Moon or in spinning space labs that simulate partial gravity.
In the meantime, strict exercise routines, nutrition, and medical monitoring would be part of daily life for the first Martian settlers.
Challenge #6: The Mind Matters Too
Physical survival is only half the story. Imagine living in a small, sealed habitat with a handful of other people, far from home, for months or years. You can’t pop outside for fresh air. You can’t call your family and chat in real time. If you’re having a rough day, there’s nowhere to go.
Space agencies take psychology very seriously. On Earth, they run long-duration isolation experiments, where volunteer crews live in simulated Mars habitats for months, to study how people handle stress, boredom, conflict, and loneliness. Some of the lessons so far:
- Team compatibility is crucial. Small disagreements can grow when people can’t get away from each other.
- Routine and purpose help. Meaningful work, regular schedules, and shared meals keep morale up.
- Connection to home matters. Even delayed messages, videos, and music from Earth can make a big difference.
- Beauty and comfort count. Plants, windows, personal items, and some privacy support mental well-being.
Mars would also bring a unique emotional experience. From the surface, Earth would be just a bright dot in the sky. For many, that could be awe-inspiring. For others, it might feel isolating. Preparing people for both is part of the challenge.
The Possibilities: How Humans Might Actually Do It
After reading about all those obstacles, you might feel discouraged. But remember, every one of these problems has teams of scientists and engineers working on it. Here are some of the most promising ideas.
Living off the Land
The key concept is called in-situ resource utilization, or ISRU. It’s a simple idea: instead of hauling everything from Earth, use what’s already on Mars. That means making oxygen from carbon dioxide, extracting water from ice, producing rocket fuel from water and the atmosphere, and even making building materials from Martian soil. The less we need to ship, the more realistic a settlement becomes.
Clever Homes
Early Mars habitats might look like pressurized tubes or domes, partially buried under soil for radiation protection. Some designs propose using 3D printers and robots to build structures from Martian dirt before humans even arrive. Others suggest settling in lava tubes, where the natural rock offers protection from radiation and temperature swings.
Start Small, Grow Slowly
Most experts imagine Mars settlement as a gradual process. First come robotic missions to scout locations and test technology. Then a small crew might stay for a limited time, followed by longer stays, and eventually a permanent base that grows over decades. Like early research stations in Antarctica, it would depend on supply from home at first and become more self-sufficient over time.
What About Terraforming?
You may have heard of terraforming, the idea of transforming Mars into a more Earth-like planet by warming it and thickening its atmosphere. It’s a popular topic in science fiction, and scientists do discuss it. However, current research suggests Mars may not hold enough easily accessible carbon dioxide to do this, and the process would take an unimaginably long time, likely centuries or more. For now, it’s best thought of as a long-term idea rather than a practical plan. Early settlers would live in protected habitats, not walk around in shirt sleeves.
Who’s Working on This?
Exploring Mars is a global effort. Space agencies such as NASA, the European Space Agency, China’s CNSA, India’s ISRO, and others have sent orbiters, landers, and rovers to study the planet. Private companies are also developing powerful new rockets and spacecraft designed for deep-space travel, and universities and research groups around the world are studying everything from radiation protection to Martian agriculture.
Timelines for the first human landing vary a lot depending on who you ask, and they often shift as technology and funding change. Many experts expect it to be possible sometime within the next few decades, while others think it may take longer. Because plans evolve quickly, it’s worth checking recent news if you want the latest updates.
Should We Go? The Bigger Questions
Beyond the technical challenges, Mars raises important ethical and practical questions.
- Safety and risk. How much risk is acceptable for the people who volunteer to go?
- Cost. Is this the best use of resources, or should we prioritize problems here on Earth? (Many argue the two goals can support each other, since space research often leads to technologies that benefit everyday life.)
- Protecting Mars. If microscopic life exists or once existed on Mars, we need to avoid contaminating it with Earth microbes, and avoid carrying anything back that could harm us.
- Who decides? Who will own, govern, or make rules on Mars? International agreements exist, but they weren’t designed for permanent settlements.
There are no simple answers, and reasonable people disagree. What’s encouraging is that these conversations are happening now, before the first settlers set foot on Mars.
So, Can Humans Live on Mars?
Let’s bring it all together.
Mars is cold, dry, dusty, and exposed to radiation. The air can’t be breathed, the journey takes months, and help is a long way off. Living there will be one of the most demanding things humans have ever attempted.
But nothing about the challenges appears to break the laws of physics. We’ve already made oxygen from Martian air, discovered water ice, landed rovers, lived on the International Space Station for decades, and learned how to build habitats in harsh environments on Earth. The path to Mars is not about a single magical breakthrough. It’s about solving many difficult problems one at a time, through careful science, engineering, teamwork, and patience.
So the most honest answer is this: yes, humans could probably live on Mars someday, but not easily, not quickly, and not without a lot of hard work. The first settlers will likely live in compact, carefully protected communities, relying on technology to survive, much like explorers in the planet’s earliest outposts.
And perhaps that’s what makes the idea so inspiring. Mars challenges us to be creative, cooperative, and bold. Even if you never travel there yourself, the knowledge gained along the way helps us understand our own planet better, from recycling water and growing food in tough conditions to protecting our environment.
So the next time you spot that little red light in the night sky, remember: it’s not just a distant dot. It’s a possibility, and people all over the world are working to turn it into reality.
Quick Recap
- Mars is harsh: cold, dry, low-pressure, and with little radiation protection.
- Travel is long: about six to nine months each way, with a communication delay.
- Key challenges: radiation, breathable air, water, food, low gravity, and mental health.
- Promising solutions: using local resources, underground or shielded habitats, and growing food in controlled environments.
- The outlook: challenging but possible, and likely to happen gradually over decades.