for National Geographic News
Recent high-resolution images taken by NASA's Mars Reconnaissance Orbiter suggest Mars may have stayed wet a billion years longer than most previous estimates, scientists report.
Researchers say they have identified water-carved features that date to the Hesperian Epoch, 3.7 to 3 billion years ago.
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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.
