Mars, once a much wetter and more dynamic planet, is now a dry and inhospitable desert. The mystery of how the red planet lost its water has fascinated scientists for decades. A groundbreaking study ...

Planetary scientists agree that Mars used to have liquid water on its surface and a water-rich atmosphere, far different from its current arid state. But an accounting of all the sources of water to ...

There is a lot of evidence from orbiting satellites and surface rovers indicating that liquid water was present long ago on the surface of Mars in the form of ponds, lakes, and rivers. But the idea ...