A worker is dwarfed by the space shuttle Discovery as he stands above the external fuel tank on launch pad 39B as the vehicle is prepared for launch at Kennedy Space Center in Cape Canaveral, Florida July 25, 2005. The large rust-colored external tank of the shuttle will be filled with 500,000 gallons of liquid hydrogen and oxygen for flight, scheduled for July 26. REUTERS/Rick Fowler JLS/TW