By Walt Hickey

Welcome to the Numlock Sunday edition.

This week, I spoke to Zach Weinersmith, who with his wife Kelly Weinersmith wrote the brand new book A City On Mars: Can we settle space, should we settle space, and have we really thought this through?, which is out this week.

I loved this book. I’ve been looking forward to it for years since they announced it, and I loved their previous book, Soonish. It’s an in-depth look at what exactly it’s going to take to get a permanent human settlement on another world. Zach and Kelly investigate not just the physics problem of getting people and material there, but also the long-term social, legal and biological issues inherent in this kind of venture. It’s an amazing read, and it’s available wherever books are sold.

Beyond A City on Mars, Zach can be found at his iconic webcomic, Saturday Morning Breakfast Cereal, and you should check out his other books, which include Soonish and Bea Wolf, his children’s book adaptation of Beowulf.

Remember, you can subscribe to the Numlock Podcast on Apple Podcasts and Spotify. This interview has been condensed and edited.

Zach, thank you so much for coming on.

I'm excited to talk about space nerd stuff.

Boy, are you. You have written a book called A City on Mars. You ask all sorts of really exciting questions throughout the book. It is not just a book about the physics of getting to Mars, which I think a lot of people fixate on. It is a book about sociology. It is a book about how communities work. It is a book about all sorts of different exciting things. Your research process was incredibly thorough. I guess just before we dive in, what was it like to write this thing? What was it like to report it out and dive into the science?

Oh man, it was kind of awful. And you know what it was? I think when you do pop science, there's this fantasy you have of, "What if I got a topic and I was out ahead of other people and it was really controversial and awesome." And you'd think that would be romantic and be like a montage. But we were so anxious, because we felt like we were really going against a lot of strongly held views by smart people. And when you do that, you feel like you really have to know what you're talking about so that you can stand your own when they are going to come at you.

And so the result of that, and our just general dorkwad-ery, was that there was just a ton of primary and technical source reading, which is awesome. Actually, it's like what I do in my free time, as a boring person. But when at some point I was reading a hundred-something pages a day of hard stuff and like you roll out of bed and you're like, "What? I have to read 50 pages of seabed international law to understand that!" It was brutal. I mean absolutely wonderful kitchen table conversations during this time, but it was tough.

Yeah, a lot of it is very compelling because again, you've had some of the finest minds that our society's produced consider what it would take to get us into space and stay there. And that I imagine has got to be a lot of fun. But then you also, you really consider all sides of this, man. You’ve got sociology, but you just mentioned you have the law.

There's a lot of legal precedent when it comes to these interesting spaces that are not owned land but nevertheless are important. Do you want to walk people through the structure of the book and what angles you take and how you dive in?

So we ended up artificially separating it into six sections, which hopefully I can actually remember, because we fussed a lot with the structure; this is a book that, as you say, goes from lots of angles. There were lots of options for how to structure it and we actually originally had it as we'll go through orders of magnitude from one person to 10 people, then 100 people. And it just turns out, I learned that sociologists don't believe there are actual meaningful, emergent obvious things different between a hundred and a thousand people where you can be like, "Okay, here's what happens now."

We ended up instead saying, "We're going to start off with what it does to your body." So that's like sex and reproduction, that's physiology, what space does to your body, and then also psychiatry stuff which was nontrivial. Then we move on to the place you might actually put that body. Ideal spaces are probably the moon or Mars, and especially Mars is probably best, which we could get into.

Then we move to how you might keep that body in that place from dying. That is to say, habitat construction. How do you build a facility in one of these places? Where might you go and what are the future goals there and the problems you need to solve. But mostly having to do with energy and shielding and also making food and oxygen and consumables.

And then at that point, we dive into the law and sociology. So then we go to a brief rundown on the "cynical history," we call it, of outer space. And the basic point of that is to position you to understand that human spacefaring is almost always purely political. It's about making declarations as a superpower and showing up other countries.

That prepares you to think about how the space law as we have it is. So we go into how the law actually works, which a lot of geeks think doesn't matter, they don't think international law exists, but it does. We know it constrains the behavior of countries and people. From there we get into some sociological questions. We'll talk about this a little more later; the sociology was at one point quite extensive, and the editor was like, "You just can't do this to readers. This is just too much," so we cut it down to looking at company towns as a potential model, and a couple other things.

Then we close out with some questions having to do with the future, in the sense of what numbers are we talking about to avoid too much inbreeding, to have economic autarchy — that is to say, being able to survive the death of Earth.

Then finally what would happen in the case of space war and how to think about the idea of space war. Yeah, so we're really trying for every angle. I could tell you, we did still leave out stuff. There was stuff we had to cut, but we tried to be as thorough as possible.

I'm so glad that you brought up the "cynical history of space," because I thought that that was just such a very thorough look. Space is one of the most romanticized things. I think that's one reason that again, this topic is so compelling, is that we just have so many stories that we tell each other about space and its role and there's a fundamental yearning to it. There's a fundamental ambition to it. You could tell a lot of stories set in space, and we have.

Whereas the cynical history of space was really just bringing things down to as brass tacks as possible. It was turning this romance into the physics and politics that it truly is, and I really appreciated it. Do you want to dive in a little bit on that, a brief cynical history of space?

Yeah, I'd love to. So it's funny. There's a power law, I can say this for your audience. There's a power law for what space stuff is about. So it's like 90 percent of all space books are about Apollo 11, in particular, where we landed on the moon. And then 90 percent of what's left is either Apollo 8, where we first went around the moon, or Apollo 13, where everything went wrong and there was a movie about it. And then down from that, it's everything else.

There's a subgenre in all this that is the political history. There are only a couple books about this, and they're mostly more scholarly because I guess regular people just don't want to read about the sort of geopolitical theory about why countries do this sort of thing. What's funny is that in those fields, and people who study the law and history, if you said, "Hey, Kennedy went to space as a purely political act," it would be like saying, "I know how to tie my shoes." It's just the most obvious thing in the world.

But if you say that to a space geek, it's like you're poking something beautiful. But we have the evidence! I mean you never know what's in a person's heart, but we know, there's evidence that after Sputnik Kennedy thought space was stupid. We really only did that big speech to Congress, which sometimes gets conflated with the one at Rice. He only did his big speech to Congress basically saying, "Give me a huge pile of money," after Bay of Pigs.

And then very shortly after, Yuri Gagarin became the first person in space and he was of course, a Soviet. So Kennedy looked like garbage and he knew it, and he was a smart PR operator. So we have private transcripts of stuff he said basically saying, "There's no reason to do this." He uses the phrase, "I'm not that into space." He just says it very explicitly, "We need to show ...