This Aug. 18, 2012 image provided by NASA shows the Curiosity rover's landing site and Mount Sharp in the distance. The six-wheel rover prepared to take its first test drive on Wednesday Aug. 22,2012 as a warm-up for the long trek to the mountain expected later this year. (AP Photo/NASA)

Associated Press
This Aug. 18, 2012 image provided by NASA shows the Curiosity rover's landing site and Mount Sharp in the distance. The six-wheel rover prepared to take its first test drive on Wednesday Aug. 22,2012 as a warm-up for the long trek to the mountain expected later this year. (AP Photo/NASA)
This Aug. 18, 2012 image provided by NASA shows the Curiosity rover's landing site and Mount Sharp in the distance. The six-wheel rover prepared to take its first test drive on Wednesday Aug. 22,2012 as a warm-up for the long trek to the mountain expected later this year. (AP Photo/NASA)
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