U.S. Senator Bill Nelson, D-Fla., questions NASA Administrator Charles Bolden during a U.S. Senate Committee on Commerce, Science, and Transportation hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)
U.S. Senator Bill Nelson, D-Fla., questions NASA Administrator Charles Bolden during a U.S. Senate Committee on Commerce, Science, and Transportation hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)