What carved these gulleys on Mars' surface? Rain, says new paper NASA/JPL-Caltech/Arizona State U

Narrow Channels on Mars Were Formed by Rainstorms, New Study Claims

Mega-floods from groundwater may have formed the largest Martian channels, but rainstorms eroding the surface seem to have created narrow gully networks 3.7 billion years ago

At least some of the channels on Mars were created by deluges of rain somewhere from 3.5 billion to 3.7 billion years ago, a new paper published in Science Advances argued on Wednesday, based on comparison...

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