U.S. Sen. Barbara Mikulski, D-Md., Chairwoman of the Senate Subcommittee on Commerce, Justice, Science, and Related Agencies of the Appropriations Committee questions NASA Administrator Charles Bolden during a hearing on the FY 2011 NASA Budget, Thursday, April 22, 2011 at the Dirksen Senate Office Building in Washington. Photo Credit: (NASA/Bill Ingalls)