NASA on Thursday said the Curiosity rover, which in August landed on Mars on an investigative mission, had found definitive evidence that water existed on Mars long ago, suggesting that the Red Planet may have once supported life. NASA said photographs of the Curiosity's landing site indicated that it was once the bed of a swiftly flowing, waist-high river. Specifically, scientists said the size, shape, and placement of the terrain's pebbles and gravel suggested the presence of a river. Scientists have long speculated that water once existed on the now-dry planet, but Curiosity's photographs offer the firmest evidence to date to support that theory.
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