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Mars Exploration Rover, Opportunity
HematitBlueberries
12/14/09

 

Future explorers will have to look closely to detect fossil traces in the rocks of Mars. Opportunity rover found hematite “blueberries” scattered across the surface of this rock. Scientists think groundwater carrying dissolved iron percolated through the sandstone to form the tiny spheres. Image credit: NASA/JPL-Caltech/Cornell.



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