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What’s carving active gullies on Mars? It’s not water

Image: Phys.org

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  • Phys.org · September 11, 2026 16:20
    Scientists were shocked when they received the first images of Martian gullies. They were even more shocked as those gullies appeared to change over time. Their similarities to gullies seen on Earth were uncanny, but all of Earth's gullies are formed by water runoff, and Mars is too cold and has…