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Sen Ben Nelson, D-FL., talks with Dr. James Green , Director,... News PhotoHorizontal,NASA,Politics,Risk,Senator,Solution,Space,Talking,Threats,USA,Washington DCPhotographer Collection: CQ-Roll Call Group 2012 © CQ Roll Call GroupUNITED STATES - MARCH 20: Sen Ben Nelson, D-FL., talks with Dr. James Green , Director, Planetary Science Division, Science Mission Directorate , National Aeronautics and Space Administration before the start of the Subcommittee on Science and Space hearing on space threats risks/solutions on March 20, 2013. (Photo By Douglas Graham/CQ Roll Call)