Rain or Snow Likely Formed Martian Rivers

By comparing the patterns of rivers in different climates here on Earth, a new Science Advances study, coauthored by Edwin Kite, assistant professor in the Department of Geophysical Sciences, adds to a growing body of evidence that river valleys on Mars were created by water flowing across the surface—the result of rain or snowmelt, not by slow leaks from underground. The answer provides clues to what Mars’ climate would have looked like eons ago when the rivers were flowing.

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