A mystery rock on Mars that suddenly appeared in front of NASA's Opportunity rover may look like a tasty donut, but it is like nothing ever seen on the Martian surface before, scientists say.
Mysterious Mars Rock Looks Like 'Jelly Donut,' Defies Explanation (Photos)
SPACE.com - 22 Jan 2014 00:05
A mystery rock on Mars that suddenly appeared in front of NASA's Opportunity rover may look like a tasty donut, but it is like nothing ever seen on the Martian surface before, scientists say.
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