In space, heads swell.
A typical human being is about 60 percent water, and in the free fall of space, the bodyâ€™s fluids float upward, into the chest and the head. Legs atrophy, faces puff, and pressure inside the skull rises.
â€śYour head actually feels bloated,â€ť said Mark E. Kelly, a retired NASA astronaut who flew on four space shuttle missions. â€śIt kind of feels like you would feel if you hung upside down for a couple of minutes.â€ť
The human body did not evolve to live in space. And how that alien environment changes the body is not a simple problem, nor is it easily solved. ...