When NASA’s Phoenix Lander touches down on Mars this weekend—presuming it survives the hot and harrowing descent to the surface—scientists hope that it finds more evidence of water. A new study in Science uses an Idaho gorge to suggest that the surface of Mars may have once been covered in huge quantities of water, though that may not be as good a portent for finding life on the Red Planet as it might sound.
While the Colorado River gradually carved the Grand Canyon over the last five or six millions years, there’s more than one way to scoop out a chasm. Short but massive deluges of water can do it, too. That’s how Michael Lamb and his team at the University of California, Berkeley think that Box Canyon in eastern Idaho was created.

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