A remarkable discovery on Mars has provided one of the clearest timelines yet for the existence of an ancient ocean on the Red Planet. Researchers have identified a vast mineral-rich “bathtub ring” in Utopia Planitia,

NASA has released a pair of sweeping new panoramas from its two active Mars rovers, Curiosity and Perseverance, offering a vivid look at how dramatically different regions of the Red Planet can be — and how each mission is uncovering a distinct chapter of Martian history.