Mars Rovers Head for New Sites After Studying Layers

NASA's Mars rover Spirit has reached a safe site for the Martian winter, while its twin, Opportunity, is making fast progress toward a destination of its own.

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<p><a href="http://www.physorg.com/news64161971.html">Mars Rovers Head for New Sites After Studying Layers</a></p> <p>NASA's Mars rover Spirit has reached a safe site for the Martian winter, while its twin, Opportunity, is making fast progress toward a destination of its own.</p>