Mission To ISS Continues For NASA's Final Space Shuttle Flight

IN SPACE - JULY 12: In this handout image provided by the National Aeronautics and Space Administration (NASA), NASA astronaut Mike Fossum, Expedition 28 flight engineer, makes a self portrait of himself through his helmet visor with the International Space Station in the background during a planned six-and-a-half-hour spacewalk July 12, 2011 in space. This is the 160th spacewalk devoted to station assembly and maintenance since construction began in 1998. Space shuttle Atlantis has embarked on a 12-day mission to the International Space Station where it will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts. This was the final mission of the space shuttle program, which began on April 12, 1981 with the launch of Colombia. (Photo by NASA via Getty Images)