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Mars Exploration rover | Photo Contest
This black-and-white microscopic image shows several, pearl-shaped rocks on a bed of sand. Some smaller, pockmarked rocks are partially buried.
Opportunity
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Blueberries on Mars

When some scientists first saw these strange beads of hematite, the spheres seemed like "blueberries" embedded in a "muffin" of martian soil.
Click on the 16 images below to see larger view
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