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Nature 434, 280-283 (17 March 2005) | doi:10.1038/434280a; Published online 16 March 2005
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Planetary science: Picturing a recently active Mars
Victor R. Baker1
Abstract
Discoveries made with the High Resolution Stereo Camera on the Mars Express orbiter show that, as recently as a few million years ago, the surface of Mars was being shaped by flowing water, lava and ice.
Spectacular ground-based images and chemical analyses of ancient sedimentary rock formations1 leave no doubt that Mars had a watery ancient past. These discoveries by NASA's Mars Exploration Rover Mission apply to the Noachian epoch of Mars history — the first several hundred million years of the Solar System, when the impact rate of meteors and comets was much higher than in the past 3–4 billion years2.
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Victor R. Baker is in the Department of Hydrology and Water Resources, and the Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona
85721-0011, USA.
e-mail: Email: baker@hwr.arizona.edu
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