A new study suggests that spending a long time in space is causing the volume of astronauts’ brains to expand. A majority of crew members aboard the International Space Station (ISS) seem to experience swelling of the optic nerve, along with a surplus of fluid that expands the actual volume of their brains. “When you’re in microgravity, fluid such as your venous blood no longer pools toward your lower extremities but redistributes headward,” Larry Kramer, professor at the University of Texas Health Science Center at Houston, and lead author of the study published in the journal Radiology this week, said in a statement.
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