What Happens to the Human Body in Space?

Space is the final frontier. But you know, it’s not like space has a lot going on. There is quite literally nothing for most of it. And yet, space makes its presence felt to your body the moment you leave the nourishing confines of our own planet. But what about the more subtle cost of spaceflight and exploration? The cost of being in an environment we simply did not evolve to live in. So, what happens to the human body in space? 

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