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This image provided by NASA shows the piece of metal with the American flag on it is made of aluminum recovered from the site of the World Trade Center towers in New York City on Mars Rover Spirit that serves as a cable guard for Spirit’s rock abrasion tool as well as a memorial to the victims of the Sept. 11, 2001, terrorist attacks. Mars Rover Opportunity has an identical piece. Ten years after NASA landed two rovers on Mars on a 90-day mission, one rover is still exploring, and the project has generated hundreds of thousands of images from the Martian surface. Now the Smithsonian’s National Air and Space Museum is presenting more than 50 of the best photographs from the two Mars rovers in an art exhibit curated by the scientists who have led the ongoing mission. (AP Photo/NASA/JPL-Caltech/Cornell University)

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