Billions of years ago, flowing water etched valleys into the surface of Mars; these scars are readily visible, but the origin of the water that carved them has been mysterious. It could have been groundwater percolating up from below the surface, or it could have been runoff from rain or snow. A new study led by Brown University graduate student Kat Scanlon has provided support for the precipitation hypothesis... To continue reading, subscribe to The Space Reporter today.
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