Humanity has always been fascinated by the prospect of living on another planet – and our nearest neighbour is the prime candidate. Could we create livable space on Mars? What would we take with us? How would our lives be different? And how would human society change? As climate change and war make the question more urgent, we ask: Could humans really live on Mars? Anna Machin talks to Why?’s first husband-wife duo, A City on Mars authors Kelly and Zach Weinersmith, about life for the first Martian settlers.  

• “People talk about Mars as a backup for humanity. But if it means taking so many steps back on human rights, I don’t want that backup. Let’s wait until we can support everyone who is up there.” - Kelly Weinersmith 

• “If we do send humans to Mars, it needs to be done very slowly. It probably won’t happen in my lifetime.” - Kelly Weinersmith 

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Written and presented by Anna Machin. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production.

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