After a beautiful hotfire test yesterday at nasastennis, let's stay on the topic of engines... check out this view of space shuttle Endeavour's aft section including the three main engines -- heritage hardware that will power the Space Launch System on future missions into deep space. This shot was captured by the Expedition 22 crew during the shuttle's approach vehicle prior to docking with the International Space Station (ISS). As part of the survey and part of every mission's activities, Endeavour performed a back-flip for the rendezvous pitch maneuver (RPM). The image was photographed with a digital still camera, using a 400mm lens at a distance of about 600 feet (180 meters). Credit: NASA #nasa #spaceshuttle #hardware #nasahistory #explorationsystems #deepspace #sls