Space Shuttle Discovery after leaving the International Space Station on March 7, 2011 during STS-133. (Photo courtesy of NASA)
Space Shuttle Discovery after leaving the International Space Station on March 7, 2011 during STS-133. Discovery, the longest-serving and most flown of all the shuttles, will be welcomed into the Smithsonian’s National Air and Space Museum collection on April 19, 2012 at the Steven F. Udvar-Hazy Center, where it will go on permanent display. (Photo courtesy of NASA)
