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NASA's rover "Opportunity" discovers doughnut shaped rock
MARS -- NASA scientists say a strange doughnut-shaped rock has been found on Mars.
The rover "Opportunity" snapped photos of it.
They say the photo appeared 12 days after a previous photo showed no rock.
They have some theories, but they aren't exactly sure how it got there.
This discovery comes as the agency celebrates 10 years since the "Spirit" and "Opportunity" rovers landed on Mars.