Space Shuttle Discovery Facebook cover from the Smithsonian Air and Space Museum

This is the space shuttle Discovery, built by NASA in the 1970s, it flew 39 times into space in over 27 years of service. It was retired in 2011 and now has a permanent home at the James S. McDonnell Space Hangar at the National Air and Space Museum's Steven F. Udvar-Hazy Center, located near Washington, D.C.

Source: http://membercentral.aaas.org/downloads/wallpaper-shuttle-discovery