This is 3-D anaglyph, from NASA's Mars Exploration Rover Spirit, shows an extreme close-up of round, blueberry-shaped grains on the crater floor near the rock outcrop at Meridiani Planum called Stone Mountain. 3D glasses are necessary.

This 3-D image from the Mars Exploration Rover Opportunity rover shows an extreme close-up of round, blueberry-shaped grains on the crater floor near the rock outcrop at Meridiani Planum called Stone Mountain. Scientists are studying these curious formations for clues about the soil's history. The observed area is 3 centimeters (1.2 inches) across.

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