A new study of astronauts' MRI brain scans reveals that long-duration spaceflight may fundamentally alter the amount of fluid in the brain. It could also affect the size and volume of the pituitary gland. The changes appear permanent, the study suggests. (n = 11)

A new study of astronauts' MRI brain scans reveals that long-duration spaceflight may fundamentally alter the amount of fluid in the brain. It could also affect the size and volume of the pituitary gland. The changes appear permanent, the study suggests. (n = 11)

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