NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

Chairman of the U.S. House Science, Space and Technology Committee Rep. Ralph Hall, R-TX, asks a question of NASA Administrator Charles Bolden during a hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

Rep. Eddie Bernice Johnson, D-TX, asks a question of NASA Administrator Charles Bolden during a House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden testifies during a U.S. House Science, Space and Technology Committee hearing on Wednesday, March 7, 2012 in Washington. Photo Credit: (NASA/Bill Ingalls)