Mars attacks. Its wisp of an atmosphere means that if you were standing on the surface, it’d be a race to see if suffocation or the sub-zero temperature killed you first. But that’s all tarring the red planet with too broad a brush, perhaps. It’s not all a rusty, frozen hellscape. At the mid-latitudes, just inches down into the ground, you’d find ice—frozen gases like carbon dioxide, even frozen water.

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