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A Nasa rover scouting for signs of past water on Mars has found the strongest evidence yet - a vein of gypsum, a mineral deposited by water, protruding from an ancient rock.
Gypsum - commonly known as plaster of Paris - typically forms from water flowing through rock.
"This is the single most bullet-proof observation that I can think of that we've made this entire mission," Cornell University planetary scientist Steve Squyres, lead researcher for Nasa's Spirit and Opportunity Mars rovers, told Reuters.
Both the chemistry and the geologic conditions "just scream water," he added.