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NASA has approved up to 18 months of further operations for its twin Mars Exploration Rovers - Spirit and Opportunity - which were originally meant to carry out missions lasting just three months. They both have found signs of a watery past on Mars since landing on the Red Planet in January 2004.
The rovers are showing signs of wear - for example, the teeth on Spirit’s rock grinding tool seem to have worn down - but otherwise remain in good shape.
The original mission cost $820m and the two previous mission extensions cost $15m. Nasa officials have declined to say how much the third will cost.

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