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Washington: After spending more than a year on a twisting ridge on Mars, NASA's Curiosity rover has snapped its last selfie as it moves on to new sights on the Red Planet."Curiosity rover has taken its last selfie on the Vera Rubin Ridge and descended toward a clay region of Mount Sharp. The twisting ridge on Mars has been the rover's home for more than a year, providing scientists with new samples and new questions to puzzle over," NASA said in a statement on Monday. On January 15, Curiosity used its Mars Hand Lens Imager (MAHLI) camera on the end of…