In the future I’m sure there will be a city on the moon. We know how to get there, it’s super close, and it could be great for further space exploration. However, there’s a problem with living on the moon for any length of time: the weak gravitational field, which is just one-sixth of the value on Earth.
Low gravity is bad for you. It causes your bones and muscles to atrophy and weakens your heart, since, basically, everything is too easy. You need exercise to offset these effects, but that’s not so simple. You can’t go out and jog around the Sea of Tranquility—you’d just start bouncing and floating.
But
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