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NASA's Mars Exploration Rover Opportunity

This image from the panoramic camera on NASA's Mars Exploration Rover Opportunity shows a rock called "Chocolate Hills," which the rover found and examined at the edge of a young crater called "Concepcion". The rover used the tools on its robotic arm to examine the texture and composition of target areas on the rock with and without the dark coating. The rock is about the size of a loaf of bread. Initial analysis was inconclusive about whether the coating on the rock is material that melted during the impact event that dug the crater. Images taken through three of the filters are combined into this false-color view of the rock, which is about the size of a football. UPI/NASA

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