The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for ...

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.

Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic ...

Two papers showed these intriguing signals, but the team stresses that there are currently many uncertainties to confirming ...