A City on Mars

The recap

Billionaires promise colonies on Mars within a generation, and enthusiasts speak of settling space as humanity's destiny. Kelly and Zach Weinersmith spent years reading the research and interviewing space scientists, engineers and legal experts to find out whether anyone has actually worked out the details. Their answer, delivered with real scholarship and a steady stream of jokes, is mostly not yet. They take the problems one at a time: what radiation, low gravity and isolation might do to human bodies, whether people could safely have children off Earth, how to build closed ecosystems that do not collapse, and the strange, underexamined world of space law, where questions of territory, property and governance remain wide open. Zach's cartoons lighten the load, and the tone stays good-natured even as the conclusions turn sceptical. This is not an anti-space book; the authors argue that the hard research should come before long-term settlement. Readers come away with a far sharper picture of what living beyond Earth would demand. The space industry moves quickly, so some specifics may date.