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Smoke and steam begin to billow outward as space shuttle Atlantis' main engines are ignited for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida as it begins its STS-135 mission to the International Space Station. Liftoff was at 11:29 a.m. (EDT) on July 8, 2011. Onboard are NASA astronauts Chris Ferguson, commander; Doug Hurley, pilot; Sandy Magnus and Rex Walheim, both mission specialists. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the space station. Atlantis also carries the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program.