Astronauts train to scale a Mars volcano at an analogue site in France. Lava tubes that crisscross the Martian surface might provide sanctuaries for the first human explorers on the Red Planet. (Photo ...

Let’s face it – you’ve thought about it at least once. Maybe twice. Maybe you were inspired by Katy Perry’s venture out to (not really) space, or loved Dune so much you want to swap your three bed ...