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

IN SPACE - JULY 9: In this handout image provided by the National Aeronautics and Space Administration (NASA), NASA astronaut Rex Walheim, STS-135 mission specialist, looks through an overhead window on the aft flight deck of the Earth-orbiting NASA space shuttle Atlantis on the second day of activity July 09, 2011 in space. 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 will be the final launch of the space shuttle program, which began on April 12, 1981 with the launch of Colombia. (Photo by NASA via Getty Images)