After a brief period of inactivity, NASA's Curiosity rover is back at work on the surface of Mars.

The little robot suffered a memory failure and a computer glitch in addition to braving some fairly turbulent weather. Despite all this, Curiosity is still surveying the Martian landscape. In fact, the robot's drill recently discovered evidence that water once existed on the Red Planet.

NBC News reported, "That kind of water no longer exists in liquid form on the Martian surface. The place where Curiosity is currently working may have once been in the vicinity of a riverbed, but it's now a cold and dry wasteland of sand and rock. In the weeks to come, Curiosity's scientists plan to drill into the rock again, looking for confirmatory clues about the potentially habitable environment in the Red Planet's past."