A new study reveals a hidden risk for Mars missions: astronauts could lose strength even if muscle size stays the same.

Extended time in space does more than challenge muscles and bones, it also alters the brain in unexpected ways. New scientific evidence suggests that microgravity changes how the brain sits inside the ...

Scientists examined brain MRI scans of astronauts and found microgravity causes upward and backward brain shifts, which gradually take months to recover after returning to Earth.

Gravity may seem constant, but it actually varies across the planet—and one of the strangest places is Antarctica, where gravity is slightly weaker than expected. Scientists have traced this “gravity ...