On Earth, gravity helps fluids in our bodies settle, but in space there's no hydrostatic pressure so fluids pool evenly through the body, causing swelling of the brain that might be responsible for eyesight problems reported by astroanuts:
One for those looking to write hard SF.
Long spaceflights affect astronaut brain volume
Extended periods in space have long been known to cause vision problems in astronauts. Now a new study suggests that the impact of long-duration space travel is more far-reaching, potentially causing brain volume changes and pituitary gland deformation.
www.sciencedaily.com
One for those looking to write hard SF.
