Donut-sized rock suddenly appears in front of Mars rover

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As we’ve learned from our recent explorations of Mars, there’s really not a whole lot going on there. Yes, there are geological processes at work, but most of them move at a nearly imperceptible pace. So that’s why after nearly ten years of Martian rover exploration, NASA scientists were surprised to see a rock suddenly “appear” in front of the Mars Rover last week.

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Story added 20. January 2014, content source with full text you can find at link above.