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A United Launch Alliance Atlas V rocket carrying NASA's Mars Science Laboratory (MSL) Curiosity rover lifts off from Launch Complex 41 at Cape Canaveral Air Force Station in Cape Canaveral, Fla., Saturday, Nov. 26, 2011. The rocket will deliver a science laboratory to Mars to study potential habitable environments on the planet. (AP Photo/Terry Renna)

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Next Mars mission to test for signs of life

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