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NASA's Perseverance Mars rover captured this mosaic of an isolated hill nicknamed "Pinestand." Scientists think sedimentary layers stacked on top of one another here could have been formed by a deep, fast-moving river. But uncertainty about their formation remains because the layers are exceptionally tall by Earth geology standards to have been created by a river – some standing 66 feet (20 meters) high. The mosaic was captured by Perseverance's Mastcam-Z camera on Feb. 26, 2023, the 718th Martian day, or sol, of the mission. The mosaic was stitched together from 18 individual Mastcam-Z image…
