Photo: NASA Images Add a Billion Years to Mars's Wet Period?

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High-resolution images taken by NASA's Mars Reconnaissance Orbiter reveal details about the origins of layered deposits inside the red planet's Valles Marineris.

Compared to layered deposits within the Valles Marineris canyons, the adjacent plains look brighter and lighter in color and reveal different erosion histories, suggesting the relatively recent presence of water, experts said.

Photographs courtesy NASA

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