Spaceflight may reposition astronauts' brain in skull: Study
A NASA-funded study analysing MRI scans of 16 Space Shuttle astronauts and 18 ISS astronauts has revealed space travel can cause the brain to shift upward in the skull and also decrease the amount of protective fluid surrounding the brain. The findings could explain why mission astronauts complain of increased pressure in the head and changes in vision, said researchers.