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Ever since Spirit and Opportunity began relaying images and data from Mars in January 2004,
geologists following their explorations from Earth have employed a lexicon unusual for
scientists, referring to martian "blueberries," "popcorn," and "deep-fried," "batter-coated"
blobs, among other things. Because the intrepid Mars Exploration Rovers are discovering a
landscape littered with formations experts have never dreamed of let alone seen before,
they've rapidly developed new terminology and new perspectives on the central question
of the mission: did liquid water ever flow on Mars? In this narrated tour, allow Steve
Squyres, the mission's principal science investigator, to guide you through a handful
of each rover's most stunning and outlandish finds and hear for yourself the many reasons
why scientists now feel certain that Mars did indeed have a wet past. To launch the
audio slide show, click on the image at left.—Lexi Krock and David Levin
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