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NASA’s Curiosity Rover Rolls Past Evidence of Ancient Water

NASA’s Curiosity Rover Rolls Past Evidence of Ancient Water
NASA’s Curiosity Mars rover captured this view of layered, flaky rocks believed to have formed in an ancient streambed or small pond.

For the past 10 years, the Curiosity rover has traveled across the Martian terrain, looking for clues to the planet’s potentially habitable past. Recently, the car-sized robot drove through a transition zone, going from an area that may have once hosted lakes on the surface to one that signifies drier conditions for the Red Planet.

NASA’s Curiosity rover took note of the change in scenery higher up on a Martian mountaintop, which the robot has been climbing since 2014. The 3.4-mile-tall (5-kilometer) Mount Sharp is the central peak in Mars’ Gale Crater, which the rover is exploring for signs of ancient water. At the base of Mount Sharp, Curiosity collected evidence for clay minerals that formed from lakes and streams that once ran through Gale Crater. But higher up on the mountain, those streams had seemingly dried up into trickles and sand dunes, which had formed above the lake sediments.

This so-called transition zone is marked by a shift from a clay-rich region to one filled with the salty mineral sulfate, and could potentially signify a major shift in Mars’ climate that took place billions of years ago. The higher up Curiosity goes on Mount Sharp, it detects less clay, and more sulfate. Curiosity will soon start drilling the last rock sample collected in the transition zone in hopes of learning more about the change in the mineral composition of the rocks in that area.

“We no longer see the lake deposits that we saw for years lower on Mount Sharp,” Ashwin Vasavada, Curiosity’s project scientist at NASA’s Jet Propulsion Laboratory, said in a NASA news release. “Instead, we see lots of evidence of drier climates, like dry dunes that occasionally had streams running around them. That’s a big change from the lakes that persisted for perhaps…

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