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'Blueberries' Inside 'Popcorn'
This view from the microscopic imager on NASA's Mars Exploration Rover Opportunity shows a type of light-colored, rough-textured spherules scientists call 'popcorn' in contrast to the darker, smoother spherules called 'blueberries.'
Formats:
Full-Res TIFF: Download, Full-Res JPEG: Download
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