NASA rover Opportunity has found what is described as "the single most powerful piece of evidence for liquid water at Mars," by Steve Squyres, Opportunity's principle investigator. The evidence, announced by researchers yesterday, is a mineral vein, comprised of gypsum that was almost certainly deposited by a water source. Opportunity has been trolling Mars for eight years along with its twin, Spirit, and this recent discovery of a mineral vein around the rim of the massive crater Endeavor is its most exciting discovery to date.
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