Martian dust storm threatens rovers' survival

In the three-and-a-half years that they've been on Mars, the NASA rovers Spirit and Opportunity have never seen anything like this: a large-scale dust storm that has darkened the skies and put the rovers in the gravest danger they have yet faced.

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<p><a href="http://www.physorg.com/news104764778.html">Martian dust storm threatens rovers' survival</a></p> <p>In the three-and-a-half years that they've been on Mars, the NASA rovers Spirit and Opportunity have never seen anything like this: a large-scale dust storm that has darkened the skies and put the rovers in the gravest danger they have yet faced.</p>