Spirit and Opportunity rovers mark five years on Mars

The US space agency's Mars rovers Spirit and Opportunity this month mark their fifth anniversary on the Red Planet, where they have endured harsh conditions and revealed a deluge of information.

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<p><a href="http://www.physorg.com/news150292822.html">Spirit and Opportunity rovers mark five years on Mars</a></p> <p>The US space agency's Mars rovers Spirit and Opportunity this month mark their fifth anniversary on the Red Planet, where they have endured harsh conditions and revealed a deluge of information.</p>