Going to space – let alone staying there – is costly and dangerous. It takes about a million dollars to get half a kilogram (1 pound) of material to the moon, and even more to Mars. And along the way, any human spacefarers must survive radiation, extreme pressure and temperature variations as well as random micrometeorites whizzing through the void like bullets.
According to a programme gaining momentum at NASA, the solution involves growing mushroom structures on the moon – then beyond.
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