If you’re anything like Kelly and Zach Weinersmith, the idea of a mass human migration to space is exciting but, well, a little flawed. As they say in their new book, A City on Mars (shortlisted for this year's Royal Society Trivedi Science Book Prize): “An Earth with climate change and nuclear war and, like, zombies and werewolves is still a way better place than Mars.”

In this episode, we speak to Kelly about why we’re not likely to see billionaires rocketing off to Mars-based bunkers, what we might eat when we live in space, and how close we really are to moving to Mars.

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