NASA’s Curiosity Rover cracked a rock below to reveal yellow crystals of sulfur in its pure elemental form.
Since October 2022, Curiosity has been off-roading in a “sulfate-bearing unit” of the Red Planet on a Denali-sized peak called Mount Sharp. There, the rover has discovered minerals that contain sulfur mixed with other elements—such as magnesium sulfate and calcium sulfate. These salts, which form as water evaporates, might reveal more about the presence—and disappearance—of bodies of water on Mars billions of years ago.
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