MESSENGER reveals a more dynamic Mercury surface

Compared with Earth, the surfaces of most other objects in the solar system appear largely static. Planetary scientists have long believed that impacts from space debris are the principal source of change on these surfaces ...

Artificial gravity provides partial protection for biology in space

Space travel to the moon, Mars, and beyond can expose astronauts to extreme conditions, causing potential health issues. To prepare for future long-duration missions, NASA studies how the effects of space—changes in gravity, ...