Crusts, cracks and other geologic features on sand dunes near the Martian equator are leading researchers to believe there may have been water there much more recently than previously thought.

The features, likely caused by the movement of thawed, salty water, turned up in images taken by China’s Zhurong rover. A chemical analysis from the rover shows that they may have formed as recently as 400,000 years ago, researchers report April 28 in Science Advances.

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