This study collected before and after brain scans from 30 astronauts who went to space.
for a longer period of time, this fluid tends to move upward, causing the ventricles to enlarge. While in the presence of gravity, this fluid is able to distribute evenly in the brain.
The study indicates that after longer missions, astronauts should wait for at least three years to allow the ventricles to fully recover. Shorter missions of two-week trips left a minimal mark on the ventricles. “The biggest jump comes when you go from two weeks to six months in space. There is no measurable change in the ventricles’ volume after only two weeks,” Seidler said.
As a result, astronauts flying to Mars, which would take around 800 to 1,000 days, may be able to acclimate to the lengthy duration of journeys.
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