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Science 16 February 2007:
Vol. 315. no. 5814, p. 909
DOI: 10.1126/science.315.5814.909c
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This Week in Science

Water may have once flowed on the surface of Mars when it was warm and wet. Today, however, all that remain are mineral deposits, including sulfates and clays. Okubo and McEwen (p. 983; see the cover) show in very detailed images from the Mars Reconnaissance Orbiter that water once flowed along fractures that crossed the layered deposits in western Candor Chasma. Geochemical bleaching and cementation are seen in the fracture zones that are similar to water-related processes on Earth.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)