Videos of astronauts on the Moon show them often bouncing across the lunar surface, helped by the fact that the gravity of our satellite is just one-sixth of Earth’s surface gravity. That experience ...

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

Add Yahoo as a preferred source to see more of our stories on Google. This image shows the globe of Mars set against a dark background. The disc of the planet features yellow, orange, blue and green ...