Former astronauts (from left) Buzz Aldrin, Michael Collins and Neil Armstrong are pictured in the Oval Office at the White House in Washington on July 20, 2009, the 40th anniversary of the Apollo 11 moon landing. (AP Photo/Alex Brandon)

Photo by: Alex Brandon

Former astronauts (from left) Buzz Aldrin, Michael Collins and Neil Armstrong are pictured in the Oval Office at the White House in Washington on July 20, 2009, the 40th anniversary of the Apollo 11 moon landing. (AP Photo/Alex Brandon)