Martian water played a major role in creating intriguing surface features on miniature sand dunes, scientists say.
harbored abundant liquid water about three billion years ago. But dramatic climate changes froze much of it as ice now locked in poles and left the bulk of the planet parched.
When Zhurong ventured close to its target dunes, which are pint-sized compared to the massive two-story ones NASA's Curiosity roverelsewhere on Mars, the laser-induced breakdown spectrometer instrument onboard the rover zapped sand grains into millimeter-sized particles. Their chemical makeup revealed hydrated minerals like sulfates, silica, iron oxide and chlorides.
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