A City on Mars
Can we settle space, should we settle space, and have we really thought this through?
byKelly Weinersmith, Zach Weinersmith
Book Edition Details
Summary
Amidst the chaos of Earth’s uncertain future, a tantalizing promise looms: the chance to forge a new life among the stars, devoid of climate woes, conflict, and the incessant chirp of social media. Yet, Kelly and Zach Weinersmith, celebrated for their razor-sharp wit and insight, delve into this cosmic dream with a skeptical eye in "A City on Mars." Their journey uncovers a galaxy of questions: How feasible is life on other planets when we don’t even know if space babies are a possibility? Will corporate empires rule lunar landscapes, and what of the ethics surrounding extraterrestrial munchies? Infused with humor and illustrated by the genius behind Saturday Morning Breakfast Cereal, this guide brilliantly navigates the precarious bridge between our earthly follies and interplanetary aspirations, challenging us to consider whether humanity is truly ready to expand its horizons—or simply repeat its terrestrial mistakes on a celestial scale.
Introduction
Picture this: you're scrolling through your social media feed when you see yet another headline about humans colonizing Mars within the next decade, or billionaires promising lunar cities that will solve Earth's problems. It sounds thrilling, doesn't it? The idea of humanity spreading across the cosmos, establishing new worlds, and securing our species' future among the stars has captured imaginations for generations. But here's the uncomfortable truth that most space enthusiasts don't want to discuss: the gap between these grand promises and harsh reality is wider than the void between Earth and Mars. While rocket technology has indeed made impressive strides, making space more accessible than ever before, the fundamental challenges of actually living and thriving beyond Earth remain largely unsolved. From the devastating effects of radiation on human bodies to the mind-boggling complexity of creating self-sustaining ecosystems in hostile environments, the obstacles are far more daunting than most popular accounts suggest. This exploration will take you behind the glossy promotional videos and optimistic timelines to examine what it would really take to establish permanent human settlements in space. You'll discover why our bodies aren't designed for life beyond Earth's protective embrace, why every potential destination in our solar system presents unique and often insurmountable challenges, and how the legal and political frameworks governing space activity could spark conflicts rather than foster the peaceful expansion of humanity.
Human Bodies in Space: Medical Challenges Beyond Earth
The human body is essentially a walking, talking biological system that evolved over millions of years to function perfectly in one very specific environment: Earth. Take us away from our home planet's gravity, atmosphere, and magnetic field, and things start going wrong in ways that would make even the most optimistic space enthusiast think twice about booking that one-way ticket to Mars. Consider what happens to your bones in space. Without the constant stress of fighting gravity, your skeleton begins to dissolve itself at an alarming rate of about one percent per month. Astronauts on the International Space Station spend two and a half hours every day exercising just to slow this process, and even then, some never fully recover. Your muscles waste away, your cardiovascular system forgets how to pump blood against gravity, and your spine stretches out, causing chronic back pain. Meanwhile, cosmic radiation bombards every cell in your body, potentially causing cancer and cognitive decline over time. But perhaps the most concerning unknown is reproduction. Can humans actually have healthy babies in space? The honest answer is that we simply don't know, and the limited animal studies we've conducted suggest it might not go well. From increased birth defects to problems with bone development, the evidence points toward reproduction being one of the biggest barriers to permanent space settlement. Without the ability to have and raise healthy children, any space colony would be entirely dependent on a constant stream of new arrivals from Earth. The medical challenges extend beyond individual health to the practical realities of healthcare in space. Imagine needing emergency surgery when the nearest hospital is millions of miles away and takes six months to reach. Space settlements would need to be completely self-sufficient medically, requiring not just doctors and equipment, but the ability to manufacture medicines and handle complex procedures in environments where blood doesn't fall down and organs float around during operations.
Space Real Estate: Why Every Option Is Terrible
If you've ever complained about your neighborhood, wait until you see the housing market in space. Every single destination beyond Earth makes the most inhospitable places on our planet look like tropical resorts. The Moon, our closest neighbor, is covered in toxic, electrically charged dust that clings to everything, has no atmosphere, experiences temperature swings from minus 250 to plus 120 degrees Celsius, and receives deadly radiation with no protection. Oh, and it has essentially no carbon, nitrogen, or easily accessible water – the basic building blocks of life. Mars, often touted as humanity's backup planet, is only marginally better. While it does have the chemical elements needed for life, they come with a catch: the entire surface is contaminated with toxic chemicals called perchlorates that interfere with human thyroid function and are particularly dangerous for developing children. The atmosphere is 95% carbon dioxide at less than one percent of Earth's pressure, meaning you'd die just as quickly as in the vacuum of space. Dust storms can engulf the entire planet for weeks, blocking out the sun and coating everything in toxic grit. The other options are even worse. Venus has surface temperatures hot enough to melt lead, crushing atmospheric pressure, and clouds of sulfuric acid. The outer planets are so far away that the journey would take years or decades, and their moons are buried under kilometers of ice. Even the most optimistic proposals for space habitats require building massive rotating structures that would dwarf any engineering project in human history. What makes this particularly challenging is that the best locations in space are incredibly limited. The Moon's polar regions, where water ice might exist in permanently shadowed craters, cover less than 0.1% of the lunar surface. These prime pieces of space real estate are smaller than a few tennis courts, yet they're the locations that every space-faring nation will want to claim. This scarcity sets up the potential for conflict rather than the peaceful expansion of humanity that space advocates envision.
Building Survival Bubbles: Engineering Life Support Systems
Creating a livable environment in space isn't just about building a structure and pumping in some air. It's about recreating Earth's entire biosphere in miniature, and doing it so perfectly that any failure doesn't result in everyone dying. This means not just providing air, water, and food, but creating a completely closed-loop ecosystem where waste becomes resources and nothing can be wasted. The most ambitious attempt at this was Biosphere 2, a 3.14-acre sealed facility in Arizona that housed eight people for two years in the 1990s. Despite costing hundreds of millions of dollars and being built on Earth with unlimited access to supplies and emergency support, the experiment nearly failed. The crew lost dangerous amounts of weight, the atmosphere became unbreathable, and social tensions reached the point where crew members were spitting on each other. And this was with Earth's gravity, atmosphere, and emergency services just outside the door. Scaling this up to support thousands or millions of people in space would require solving problems we've barely begun to understand. How do you grow enough food in artificial light while recycling every scrap of organic matter? How do you maintain air quality when every breath, every meal, and every biological function affects the delicate balance of your sealed world? The crew of Biosphere 2 spent 20% of their time just maintaining their life support systems, and they weren't even dealing with the additional challenges of radiation, toxic soil, or the need to manufacture everything locally. The energy requirements alone are staggering. A Mars settlement would need nuclear reactors or solar panel arrays covering hundreds of square kilometers just to power basic life support, never mind the energy-intensive processes of extracting water from soil, creating breathable air, and manufacturing everything from medicine to spare parts. Every component would need to be redundant and repairable, because there's no calling for help when your air recycling system breaks down 40 million miles from the nearest hardware store.
Space Law and Politics: The Legal Mess We're Heading Into
While engineers focus on the technical challenges of space settlement, there's another equally complex problem that gets far less attention: the legal and political framework governing who can do what in space. The current system of space law was created in the 1960s during the Cold War, when only two countries had space capabilities and the primary concern was preventing nuclear weapons from being stationed in orbit. Today's reality of multiple space-faring nations and private companies with their own rockets and ambitions doesn't fit neatly into this decades-old legal framework. The Outer Space Treaty, signed in 1967, establishes that no nation can claim territory in space, but it allows unlimited use of space resources. This creates a bizarre situation where you can't own land on the Moon, but you can apparently strip-mine it, build massive installations on it, and exclude others from the areas you're using. It's like having a law that says you can't own a public park, but you can set up a permanent camp, dig holes wherever you want, and tell other people they can't use the areas you've claimed. This legal ambiguity becomes dangerous when combined with the scarcity of desirable locations in space. Those tiny polar regions on the Moon with water ice and near-constant sunlight could become flashpoints for international conflict if multiple nations arrive with competing claims. The current U.S. interpretation of space law essentially allows a "first come, first served" approach to space resources, which could lead to a scramble for territory reminiscent of 19th-century colonial land grabs. The situation is made more complex by the involvement of private companies with their own agendas. When SpaceX's Starlink service declared in its terms of service that "no Earth-based government has authority over Martian activities," it was making a legal claim that could have serious implications for future space settlements. While this particular clause was largely symbolic, it illustrates how the intersection of corporate interests, national ambitions, and unclear international law could create conflicts that make space settlement more dangerous rather than safer for humanity.
Summary
The most important insight from examining the realities of space settlement is that the gap between our dreams and our capabilities is not just technological – it's biological, ecological, legal, and fundamentally human. While we've made remarkable progress in building rockets that can reach other worlds, we've barely begun to solve the problems of keeping humans alive and healthy once they get there, creating sustainable ecosystems in hostile environments, or managing the political complexities of multiple nations and corporations competing for limited resources in space. This doesn't mean space settlement is impossible, but it suggests that the timeline for permanent, self-sustaining human communities beyond Earth should be measured in centuries, not decades. The challenges are so interconnected and complex that rushing toward settlement without solving these fundamental problems could create more risks than benefits for humanity. Perhaps the most important question isn't whether we can settle space, but whether we should do so before we've learned to better manage our relationships with each other and our home planet. What would it mean for humanity if our expansion into space recreated the same conflicts and inequalities we're trying to escape on Earth?
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By Kelly Weinersmith
