Blueberries and filling

Blueberries and filling
Blueberries and filling Opportunity found tiny spherules that look like blueberries when images of them are processed in false color, a technique that enables scientists to better discern the geological elements in the primarily monotone rusty red-orange landscapes present day Martian landscapes. Since they were found to be the source of the hematite signal orbital instruments had picked up and since hematite generally forms in water, the MER scientists hypothesized they are evidence of water on this site billions of years ago. Spirit found evidence in a rock called Humphrey (right). By grinding into its surface, she found a bright material filling internal cracks. Such material may have crystallized from water trickling through the volcanic rock, the MER scientists theorized. NASA / JPL-Caltech / Cornell / USGS

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