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11 Jan 2018 04:03:56 UTC
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Steven Squyres: The Mars Exploration Rover Mission
The Mars Exploration Rovers Spirit and Opportunity have both found evidence for water-related processes at their landing sites. In Gusev crater, Spirit found only trace evidence for the action of water on the lava-covered plains of the crater floor. This water action left thin salt-rich deposits on the surfaces of rocks and in fractures within rocks, and what appear to be magnesium sulfate salt concentrations in soils. The older rocks in the Columbia Hills, however, show evidence for substantial alteration by water. At Meridiani Planum, Opportunity has found layered sedimentary rocks that are a mixture of fine-grained silicate particles and chemical sediments precipitated from liquid water....
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UC Berkeley
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English
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