Mars mystery of the white rock leaves Nasa scientists puzzled

Scientists are stumped as to how a rock mysteriously appeared in images of the same spot taken two weeks apart by Nasa's Mars rover Opportunity.

It showed a bright white rock, about the size of a doughnut, where only barren bedrock had appeared in a picture it had sent back two weeks earlier. Scientists suspect the rock was flipped over by one of the rover's wheels.

Source - [link to www.theguardian.com]

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