What's Carving Active Gullies on Mars? It's Not Water
Illustrative image 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 the water run-off, and Martian is too cold and has too sparse an a…
Source：Universe Today
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