• April 20, 2006

    Episode 32: Was Mars Wet?

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    Some scientists believe gullies running along the inner edges of some Martian craters were carved by liquid water, but new findings suggest they might instead be the result of landslides triggered by wind and meteor impacts. Researchers recently noticed similar gullies on a crater of Earth's Moon, where no water exists. The Moon gullies were likely caused by dry flows of dust and sand.