Gusev Crater, the Mars Exploration Rover Spirit landing site (160 km diameter; 14.5°S, 184.5°W), has been identified in previous studies as a prime site of geological and exobiological interest on the basis of its potential for having hosted a fluviolacustrine environment; such environment may have been favorable for the development of biological activity. The origin and nature of the materials present at the surface of Gusev Crater are still being debated. In previous studies based on geomorphological an…
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