NASA Administrator Michael Griffin prepares for a television interview. Thursday, Nov. 20, 2008, NASA Headquarters, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, left prepares for a television interview. Thursday, Nov. 20, 2008, NASA Headquarters, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin prepares for a television interview. Thursday, Nov. 20, 2008, NASA Headquarters, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin prepares for a television interview. Thursday, Nov. 20, 2008, NASA Headquarters, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin prepares for a television interview. Thursday, Nov. 20, 2008, NASA Headquarters, Washington. Photo Credit: (NASA/Bill Ingalls)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Michael Griffin addresses the media during his first press conference as NASA Administrator, Monday, April 18, 2005, at NASA Headquarters in Washington, DC. Photo Credit: (NASA/Renee Bouchard)

Portrait, Michael Griffin, Administrator, National Aeronautics and Space Administration (NASA). Washington, DC, April 25, 2005. Photo Credit: (NASA/Renee Bouchard)

John H. Marburger, Science Adviser to the President and Director of the Office of Science and Technology Policy (OSTP), left, talks with NASA Administrator Michael Griffin, center, while his wife Rebecca and daughter Katie look on following his swearing-in, Thursday, April 14, 2005, in Washington. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin talks with employees during a NASA Update program at NASA Headquarters, Tuesday, June 28, 2005, in Washington.  Photo Credit: (NASA/Bill Ingalls)

Dr. Michael Griffin, right, talks with his wife Rebecca Griffin prior to testifying at his confirmation hearing before the U.S. Senate Commerce Committee, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, left, is administered the oath of office by John H. Marburger, right, Science Adviser to the President and Office of Science and Technology Policy Director, during a private ceremony at the Old Executive Office Building, Thursday, April 14, 2005, in Washington, while his wife Rebecca and daughter Katie look on. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, left, is administered the oath of office by John H. Marburger, right, Science Adviser to the President and Office of Science and Technology Policy Director, during a private ceremony at the Old Executive Office Building, Thursday, April 14, 2005, in Washington, while his wife Rebecca and daughter Katie look on. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Dr. Michael Griffin is seen prior to his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Dr. Michael Griffin delivers a statement during testimony in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Dr. Michael Griffin smiles during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Dr. Michael Griffin smiles during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Dr. Michael Griffin is seen during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Dr. Michael Griffin smiles during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin delivers remarks during a NASA Update program at NASA Headquarters, Thursday, April 14, 2005, in Washington after being sworn in earlier that morning as NASA's 11th Administrator. Photo Credit: (NASA/Heidi Fancher)

NASA Administrator Dr. Michael Griffin speaks in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Dr. Michael Griffin is seen during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Dr. Michael Griffin smiles during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

Yuriy Yekhanurov, Prime Minister of Ukraine, left, and NASA Administrator Michael Griffin, walk together prior to the start of a meeting Tuesday, Nov. 1, 2005, at NASA Headquarters in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, right, meets with aerospace engineer Burt Rutan Wednesday, April 20, 2005 at NASA Headquarters in Washington. Photo Credit: (NASA/Renee Bouchard)

U.S. Senator Barbara Mikulski, D-Md., left, talks with Michael Griffin as Senator Kay Bailey Hutchison, R-Tx., and Griffin's wife Rebecca look on prior to his testimony, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit: (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

Dr. Michael Griffin testifies, Tuesday, April 12, 2005, during his confirmation hearing before the U.S. Senate Commerce Committee at the Russell Senate Office Building in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

New NASA Administrator Michael Griffin (right) shares a moment with Director Kevin Petersen (left) and F-15B project manager Stephen Corda (center) during Griffin's visit to NASA Dryden Flight Research Center on Tuesday, May 24.

U.S. Senator Barbara Mikulski, D-Md., testifies before the U.S. Senate Commerce Committee during the confirmation hearing of Dr. Michael Griffin, rear center, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. Griffin currently heads the space department at Johns Hopkins University's Applied Physics Laboratory. If confirmed by the full U.S. Senate, Dr. Griffin would be NASA's 11th administrator. Photo Credit: (NASA/Renee Bouchard)

U.S. Senator Barbara Mikulski, D-Md., testifies before the U.S. Senate Commerce Committee during the confirmation hearing of Dr. Michael Griffin, right background, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. Griffin currently heads the space department at Johns Hopkins University's Applied Physics Laboratory. If confirmed by the full U.S. Senate, Dr. Griffin would be NASA's 11th administrator. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin testifies at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin testifies at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin prepares to testify at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin prepares to testify at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin testifies at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin testifies at a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

John H. Marburger, Science Adviser to the President and Director of the Office of Science and Technology Policy (OSTP), left, shakes hands with NASA Administrator Michael Griffin following his swearing-in, Thursday, April 14, 2005, in Washington. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, left, meets with CEO of SpaceX Elon Musk, right, Wednesday, April 20, 2005 at NASA Headquarters in Washington. Looking on in the background are Larry Williams, NASA astronaut Marsha Ivins and NASA manager Christopher Shank. Photo Credit: (NASA/Renee Bouchard)

NASA Administrator Michael Griffin, foreground left, sits across the table from Yuriy Yekhanurov, Prime Minister of Ukraine, during a courtesy visit Tuesday, Nov. 1, 2005, at NASA Headquarters in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, left, shakes hands with Yuriy Yekhanurov, Prime Minister of Ukraine after a visit to NASA Headquarters on Tuesday, Nov. 1, 2005 in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, left, presents Yuriy Yekhanurov, Prime Minister of Ukraine, with a montage following a meeting Tuesday, Nov. 1, 2005, at NASA Headquarters in Washington. Photo Credit: (NASA/Bill Ingalls)

Director General of the National Space Agency of Ukraine Yuriy Sergiyovych Alekseyev, left, NASA Administrator Michael Griffin, center, and Prime Minister of Ukraine Yuriy Yekhanurov pose for a photograph prior to their meeting at NASA Headquarters, Tuesday, Nov. 1, 2005, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Special Assistant Mr. Christopher Shank, left, and NASA Administrator Michael Griffin talk during a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

New NASA Administrator Michael Griffin makes a point during a town hall meeting with NASA Dryden employees on Tuesday, May 24, 2005.

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin discusses the results of the agency's exploration architecture study on Monday, Sept. 19, 2005, at NASA Headquarters in Washington. The study made specific design recommendations for a vehicle to carry crews into space, a family of launch vehicles to take missions to the moon and beyond, and a "lunar mission architecture" for landing on the moon. Photo Credit: (NASA/Bill Ingalls)

U.S. Senator Barbara Mikulski, D-Md., testifies before the U.S. Senate Commerce Committee during the confirmation hearing of Dr. Michael Griffin, rear center, Tuesday, April 12, 2005, at the Russell Senate Office Building in Washington. Griffin currently heads the space department at Johns Hopkins University's Applied Physics Laboratory. If confirmed by the full U.S. Senate, Dr. Griffin would be NASA's 11th administrator. Photo Credit: (NASA/Renee Bouchard)

U.S. Senator Daniel K. Inouye, D-Hawaii, left, speaks as U.S. Senator Ted Stevens, R-Alaska, looks on during the confirmation hearing for Dr. Michael Griffin, in front of the U.S. Senate Commerce Committee, Tuesday, April 12, 2005, in Washington. If confirmed, Griffin, who currently heads the space department at the Johns Hopkins University Applied Physics Laboratory will become NASA's 11th administrator. Photo Credit (NASA/Renee Bouchard)

U.S. Senator Bill Nelson. R-Fla., questions NASA Administrator Dr. Michael Griffin during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

Senator Trent Lott, R-Miss., questions NASA Administrator Dr. Michael Griffin during his appearance in front of the Senate Commerce Committee Science and Space Subcommittee hearing on Human Space Flight: The Space Shuttle and Beyond, Wednesday, May 18, 2005, in the Russell Senate Office Building on Capitol Hill in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin outlines the President's budget for fiscal year 2007 during a news conference, Monday, Feb. 6, 2006, at NASA Headquarters in Washington. Griffin was joined by the heads of NASA's four mission directorates to explain how the proposed $16.8 billion dollar budget supports the Vision for Space Exploration. The budget represents a 3.2% increase above the fiscal year 2006 appropriated budget. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin outlines the President's budget for fiscal year 2007 during a news conference, Monday, Feb. 6, 2006, at NASA Headquarters in Washington. Griffin was joined by the heads of NASA's four mission directorates to explain how the proposed $16.8 billion dollar budget supports the Vision for Space Exploration. The budget represents a 3.2% increase above the fiscal year 2006 appropriated budget. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin outlines the President's budget for fiscal year 2007 during a news conference, Monday, Feb. 6, 2006, at NASA Headquarters in Washington. Griffin was joined by the heads of NASA's four mission directorates to explain how the proposed $16.8 billion dollar budget supports the Vision for Space Exploration. The budget represents a 3.2% increase above the fiscal year 2006 appropriated budget. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator, Michael Griffin watches the launch of the Space Shuttle Atlantis (STS-122) from the Launch Control Center Thursday, Feb. 7, 2008, at the Kennedy Space Center in Cape Canaveral, Fla. The Shuttle lifted off from launch pad 39A at 2:45p.m. EST. Photo Credit: (NASA/Bill Ingalls)

Rep. Sherwood Boehlert, R-NY., questions NASA Administrator Michael Griffin during a House Science Committee hearing, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

Rep. Sherwood Boehlert, R-NY., left, talks with NASA Administrator Michael Griffin prior to a hearing before the House Science Committee, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

Rep. Bart Gordon, D-TN., questions NASA Administrator Michael Griffin during a House Science Committee hearing, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

Rep. Dana Rohrabacher, R-CA., questions NASA Administrator Michael Griffin during a House Science Committee hearing, Tuesday, June 28, 2005, Rayburn House Office building, Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin testifies during a hearing before the House Science & Technology Committee regarding NASA's FY 2007 budget request, Thursday, Feb., 16, 2006, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin speaks during a media briefing about the space shuttle program and processing for the STS-121 mission, Friday, April 28, 2006, at NASA Headquarters in Washington. Photo Credit (NASA/Bill Ingalls)

NASA Dryden research pilot Jim Smolka (left) details a recent flight experiment on a modified F-15B research aircraft to test range program manager Jerry McKee, center director Kevin Petersen and NASA Administrator Michael Griffin (right) during Griffin's initial visit to NASA's Dryden Flight Research Center on Tuesday, May 24.

NASA Administrator, Michael Griffin and other management watch the launch of the Space Shuttle Atlantis (STS-122) from the Launch Control Center Thursday, Feb. 7, 2008, at the Kennedy Space Center in Cape Canaveral, Fla. The Shuttle lifted off from launch pad 39A at 2:45p.m. EST. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator, Michael Griffin watches the launch of the Space Shuttle Discovery (STS-124) from the Launch Control Center Saturday, May 31, 2008, at the Kennedy Space Center in Cape Canaveral, Fla. The Shuttle lifted off from launch pad 39A at 5:02 p.m. EDT. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin reviews his written testimony prior to the start of a hearing before the House Science & Technology Committee regarding NASA's FY 2007 budget request, Thursday, Feb., 16, 2006, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin reads from his written testimony while testifying in front of a hearing before the House Science & Technology Committee regarding NASA's FY 2007 budget request, Thursday, Feb., 16, 2006, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin addresses NASA employees and members of the media about the responsibilities of the NASA centers associated with the Constellation Program for robotic and human Moon and Mars exploration during a NASA Update on Wednesday, June 5, 2006, at NASA Headquarters in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, speaks during a press conference outlining specific center responsibilities associated with the Constellation Program for robotic and human Moon and Mars exploration, Monday, June 5, 2006, at NASA Headquarters in Washington. Photo Credit (NASA/Bill Ingalls)

NASA Administrator Michael Griffin is seen through a television camera at a NASA Update announcing to NASA employees and members of the media the responsibilities of the NASA centers associated with the Constellation Program for robotic and human Moon and Mars exploration on Wednesday, June 5, 2006, at NASA Headquarters in Washington. Griffin was joined by Scott J. Horowitz, NASA Associate Administrator for Exploration Systems and Jeff Hanley, Constellation Program Manager, right. Dean Acosta, NASA Deputy Assistant Administrator and Press Secretary, far left, moderates the program. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, second from right, talks with NASA Advisory Council members at the Rayburn House Office Building, Tuesday, Nov. 29, 2005, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Michael Griffin, second from right, talks with NASA Advisory Council members at the Rayburn House Office Building, Tuesday, Nov. 29, 2005, in Washington. Photo Credit: (NASA/Bill Ingalls)