Jan 17th 2014, 13:31
On the left, a photo taken 3528 days after the Opportunity rover arrival to Mars. On the right, the exact same spot 12 Mars days later. Notice the difference? NASA JPL scientists did too: "It's about the size of a jelly doughnut. It was a total surprise, we were like 'wait a second, that wasn't there before, it can't be right. Oh my god! It wasn't there before!' We were absolutely startled."
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