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This Monday, Sept. 12, 2005 photo provided by Japan Aerospace Exploration Agency shows an asteroid named Itokawa photographed by the Hayabusa probe. On Wednesday, March 25, 2015, NASA announced it is aiming to launch a rocket to an asteroid in five years and grab a boulder off of it - a stepping stone and training mission for an eventual trip sending humans to Mars. Itokawa, 2008 EV5 and Bennu are the candidates for the mission. (AP Photo/Japan Aerospace Exploration Agency)

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