A northern summer dust storm on Mars boosted high-altitude water escape, suggesting short-lived events may play a bigger role ...

For years, scientists have been looking for signs of liquid water just beneath the surface of Mars. The problem, though, is that the observations from various orbiting probes have been maddeningly ...

Central to those questions is the status of liquid water - the stuff of life - on the planet. It is now indisputable that there was once water flowing on Mars, but how much, and even why, is a matter ...