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NASA's JPL Mars rover Spirit landed
in Gusev Crater on Mars on 3 Jan., 2004 for a
mission planned to last 90-days. Yet two years
later along with robotic explorer Opportunity
they are still going strong. Soon after landing
Opportunity found layered bedrock suggesting
geological evidence of a shallow ancient sea. Well
over a year later, Spirit found large amounts of
layered bedrock after driving more than 3.2
kms and climbing into the "Columbia Hills.
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Spirit self-portrait. Image credit:
NASA/JPL-Caltech/Cornell
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