Scientists studying data from China’s Zhurong rover have for the first time found cracked layers on tiny Martian dunes, implying that S the Red Planet was a salt-rich watery world as recently as 400,000 years ago. Since landing in Mars’ northern hemisphere in May 2021, the rover has rolled close to four nearby crescent-shaped dunes in the Utopia Planitia region to investigate their surface composition. All four of the miniature,
