President Bush addresses the nation from the NASA Lyndon B. Johnson Space Center in Houston during a memorial service Feb. 4, 2003, in honor of the seven astronauts who died in the space shuttle Columbia disaster. "This cause of exploration and discovery is not an option we choose; it is a desire written in the human heart," Bush said. "We find the best among us, send them forth into unmapped darkness, and pray they will return. They go in peace for all mankind, and all mankind is in their debt." White House photo by Paul Morse. President Bush addresses the nation from the NASA Lyndon B. Johnson Space Center in Houston during a memorial service Feb. 4, 2003, in honor of the seven astronauts who died in the space shuttle Columbia disaster. "This cause of exploration and discovery is not an option we choose; it is a desire written in the human heart," Bush said. "We find the best among us, send them forth into unmapped darkness, and pray they will return. They go in peace for all mankind, and all mankind is in their debt." White House photo by Paul Morse. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 426112-N-GDJ21-676.jpg Photo Gallery