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Dark lines that appear seasonally on sunny Martian slopes could be evidence of flowing water, University of Arizona scientists say in a paper published today in the journal Science.The lines showed up when an undergraduate researcher at the UA's Lunar and Planetary Laboratory created digital terrain models of portions of the surface of Mars, basically converting the two-dimensional images taken by the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter into 3-D maps. Read more
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