Their 90-day warranties expired long ago. But NASA’s six-wheeled Martian rovers still are going strong. After a bleak winter on the fourth rock from the sun, Spirit and Opportunity are rolling again.

Three years ago, when the first of the two rovers bounced to a landing on Mars, scientists hoped one of them might last long enough to transmit a few hundred pictures from the surface and help them decide where the arid planet’s water went.

Full Story Via Indystar.com

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