Astronaut training. NASA Astronaut Peggy A. Whitson being lowered into the pool at the Neutral Buoyancy Laboratory (NBL), Houston, Texas, USA. She is wearing a training version of the Extravehicular Mobility Unit (EMU) space suit worn during space missions. The pool at the NBL simulates the weightlessness of space. Whitson is the planned commander of Expedition 16, the sixteenth expedition to the International Space Station (ISS), which is scheduled to launch on October 6th 2007. Photographed on April 17th 2007.