Earth is not well. The promise of starting life anew somewhere far, far away—no climate change, no war, no Twitter—beckons, and settling the stars finally seems within our grasp. Or is it? Critically acclaimed, bestselling authors Kelly and Zach Weinersmith set out to write the essential guide to a glorious future of space settlements, but after years of research, they aren’t so sure it’s a good idea. Space technologies and space business are progressing fast, but we lack the knowledge needed to have space kids, build space farms, and create space nations in a way that doesn’t spark conflict back home. In a world hurtling toward human expansion into space, A City on Mars investigates whether the dream of new worlds won’t create nightmares, both for settlers and the people they leave behind. In the process, the Weinersmiths answer every question about space you’ve ever wondered about, and many you’ve never considered.

“Scientific, educational, and fun as hell.”

— Andy Weir, New York Times bestselling author of The Martian and Project Hail Mary

“There is simply no more engrossing, entertaining, or thorough way to understand the intense challenge of humanity's off-Earth future than A City on Mars. I LAUGHED THE WHOLE WAY THROUGH.”

— Hank Green, New York Times bestselling author of An Absolutely Remarkable Thing

“Listen up, humans. How to poop in space will be the least of our concerns. Herein are challenges most space-heads, including me, never even considered: not just technological, but legal, ethical, geopolitical. Despite the breadth and depth of research and some impressive near-wonk-level detail, this is a clear, lively, and hilarious read. Slam dunk, Weinersmiths!”

— Mary Roach, New York Times bestselling author of Fuzz and Packing for Mars

"A City on Mars is deeply researched, hilarious, and sobering. Zach and Kelly Weinersmith have given us a bracing to-do list for the new age of space. Highly, highly recommended.”

— James S.A. Corey, author of The Expanse series