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From Discovery News:
A huge dust storm on Mars has cut power to NASA's twin roving geology stations and delayed the start of an investigation into a large impact crater that bears an unusual ring around its inner walls.
The Spirit and Opportunity rovers, which have been exploring opposite sides of the planet's equatorial region for three and a half years, charge their batteries with solar panels that need direct sunlight.
But a massive dust storm, estimated to be thousands of miles wide, has blanketed the rovers with dust and impaired their ability to collect sunlight.
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