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Mystery White Rock Inexplicably Appears Near NASA Mars Rover

Scientists are stumped as to how a rock mysteriously appeared in images taken two weeks apart by NASA's Mars rover Opportunity. The rover, which landed in an area known as Meridiani Planum a decade ago, is exploring the rim of a crater for signs of past water. Another rover, Curiosity, touched down on the opposite side of the planet in 2012 for a more ambitious mission to look for past habitable environments. For the moment, however, scientists are pondering a more immediate...

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