Study reveals how dry ice shapes Martian dunes every spring
Scientists have revealed that Martian gullies that appear each spring are formed when blocks of dry ice, not water, slide down sand dunes. During an experiment under simulated Martian conditions, researchers placed CO₂ ice on sand slopes of varying angles. As the ice sublimated, it blasted sand outward, carving winding gullies, replicating the gullies seen on Mars.