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

IN SPACE - JULY 12: In this video screen grab provided by the National Aeronautics and Space Administration (NASA), NASA astronaut Ronald Garan on the Canada Arm 2 and astronaut Michael Fossum (top) do work to remove a failed ammonia pump module from a storage platform on the International Space Station 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 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)