Mars Colonization: Humanity's Boldest Leap or a Ticket to Stay?

Jan de Vries · 2026-08-13

When we talk about going to Mars, we usually picture flags, footprints, and a triumphant return home. But what if the real story is a one-way ticket? Harry Margulies digs into this uncomfortable question, exploring whether the first Martians will ever come back—or if they'll adapt to the Red Planet's low gravity so completely that Earth feels like a distant memory. It's a wild thought, isn't it? We spend so much time obsessing over the launch and the landing that we rarely stop to ask: what happens to the human body and mind when you stay? Let's break down what Margulies found, and why this might be the most important decision we never talk about. ### The Gravity Problem: Your Body Will Change Here's the thing about Mars: it only has about 38 percent of Earth's gravity. That sounds like a fun detail until you realize what it does to you. In that low gravity, your muscles start to waste away, your bones lose density at an alarming rate, and your heart doesn't have to work as hard to pump blood. Astronauts on the International Space Station deal with this, but they come home after six months. Mars settlers won't have that luxury. Margulies points out that after a year or two on Mars, your body would become fundamentally different. You'd be weaker, your balance would shift, and your cardiovascular system would recalibrate to a lighter world. The scary part? No one knows if those changes are reversible. If you spent five years on Mars, could you even stand up on Earth again? Some scientists think you might not survive the return trip. That's not science fiction—that's biology. ### A One-Way Trip by Design Here's the twist that makes this more than just a physics problem. Some experts argue that a one-way trip isn't a failure—it's the only realistic plan. Think about it. To send a return vehicle, you need fuel, landing gear, and a launch pad on Mars. That's a massive amount of extra weight and cost. But if you send settlers with no intention of bringing them back, you can pack more supplies, more food, and more scientific equipment. It's a brutal trade-off, but a practical one. Margulies explores this idea without sugarcoating it. He asks whether we're ready to send people on a mission that's essentially permanent. It's one thing to volunteer for a dangerous job. It's another to sign up for a life where you'll never feel the sun on your face or take a deep breath of fresh air again. That's a heavy psychological burden, and it's not just about courage—it's about whether humans can thrive, not just survive, in a place that's trying to kill us. ### What Would You Be Willing to Give Up? I think the most striking part of Margulies' analysis is how he frames the choice. This isn't a tech problem or a funding problem. It's a human problem. Would you leave everything behind—your family, your friends, the ocean, the smell of rain—to be part of something historic? For some people, the answer is yes. They see Mars as the ultimate frontier, a chance to build a new society from scratch. For others, it sounds like a slow, lonely death sentence. Here's what I keep coming back to: the settlers won't just be astronauts. They'll be colonists, which means they'll have kids, build homes, and create a culture. Those children will be born in low gravity. They'll never know what it feels like to weigh 150 pounds on Earth. For them, Mars won't be a sacrifice—it'll be home. And that changes the entire conversation. We're not just sending people to another planet. We're starting a new branch of the human family tree. ### The Real Cost of Staying Let's talk numbers for a second, because money always plays a role. A single Mars mission could cost anywhere from $100 billion to $500 billion, depending on who you ask and what technology you use. That's not pocket change. But the cost of bringing people back? That could double or triple the bill. When you look at it that way, the one-way trip isn't just a romantic idea—it's an economic necessity. Governments and private companies have to decide if they're buying a round-trip ticket or a permanent settlement. Those are very different investments. Margulies doesn't give us a clean answer, and I don't think he should. The truth is, we don't know yet whether Mars will be humanity's greatest adventure or a beautiful prison. What we do know is that the decision won't be made by scientists alone. It'll be made by all of us, through the stories we tell and the values we hold. So, what do you think? Would you go, knowing you might never come back? It's a question worth sitting with. --- This article was originally inspired by Harry Margulies' exploration of Mars colonization and its long-term implications for human settlers.