7.7 days old moon
53.7 percent lit
Seriously? Space travel? Earth is already friendly. The brain shifted into a place that usually causes concussions when injured. It seems to me there are issues not yet realized in a way that provides a path forward.
I hope space agencies simply dismisses these findings. This is not the sacrifice that has to be paid for space travel. This is a result of space travel over extended periods of time. If space travel is to result in pioneers on friendly planets their brains have to optimally function to ensure good outcomes.
November 1, 2017
By Rachel Rettner
Spending prolonged time in space (click here) can lead to striking changes in an astronaut's brain structure, a new study finds. These changes may help explain some of the unusual symptoms that astronauts can experience when returning to Earth.
In the study, researchers scanned the brains of 34 astronauts before and after they spent time in space. Eighteen of the astronauts participated in long-duration missions (close to six months, on average) aboard the International Space Station, and 16 astronauts participated in short-duration missions (about two weeks, on average) in space shuttle flights.
The brain scans revealed that most astronauts who participated in long-duration missions had several key changes to their brain's structure after returning from space: Their brains shifted upward in their skulls, and there was a narrowing of the cerebrospinal fluid (CSF) spaces at the top of the brain. (CSF is a clear liquid that flows between the brain and its outer covering, and between the spinal cord and its outer covering.) However, none of the astronauts on short-duration missions exhibited these brain changes.... 
