'The brain consistently moved upward and backward': Astronauts' brains physically shift in their heads during spaceflight

An image of a brain scanned during an MRI. A new study analyzed brain MRI scans from 26 astronauts and found that the longer someone lived in space, the more their brain shifted in their skull. A new study analyzed brain MRI scans from 26 astronauts and found that the longer someone lived in space, the more their brain shifted in their skull.