<p>The tail section of the Space Shuttle <a href="https://en.wikipedia.org/wiki/en:Space_Shuttle_Endeavour" class="extiw" title="w:en:Space Shuttle Endeavour"><i>Endeavour</i></a>.  Visible here are some more <a href="https://en.wikipedia.org/wiki/en:Reaction_control_system" class="extiw" title="w:en:Reaction control system">RCS</a> thrusters, the <a href="https://en.wikipedia.org/wiki/en:Rudder" class="extiw" title="w:en:Rudder">rudder</a> and one of two <a href="https://en.wikipedia.org/wiki/en:Elevator_(aircraft)" class="extiw" title="w:en:Elevator (aircraft)">elevators</a>, the <a href="https://en.wikipedia.org/wiki/en:Drogue_parachute" class="extiw" title="w:en:Drogue parachute">drogue chute</a> container (the flat area just under the rudder but above the engine bells), and the <a href="https://en.wikipedia.org/wiki/en:Space_Shuttle_Main_Engine" class="extiw" title="w:en:Space Shuttle Main Engine">space shuttle main engine</a> (SSME) bells.  The SSMEs are actually not what get the space shuttle off the ground and achieve escape velocity; the <a href="https://en.wikipedia.org/wiki/en:Space_Shuttle_Solid_Rocket_Booster" class="extiw" title="w:en:Space Shuttle Solid Rocket Booster">solid rocket boosters</a> (SRBs) do that and the SSMEs merely help.  The SSMEs are mostly used for orbital maneuvering and retrofire (to break orbit and initiate reentry).  During ascent, the SSMEs are fueled by the large, orange <a href="https://en.wikipedia.org/wiki/en:Space_Shuttle_external_tank" class="extiw" title="w:en:Space Shuttle external tank">external fuel tank</a> instead of the fuel stored onboard the shuttle itself.
</p><p>The SSME bells are truly massive, and a close-up photo of an SSME removed from a shuttle can be found <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/fastlizard4/8657674498">here</a> (internals) and <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/fastlizard4/8657671558">here</a> (engine bell).
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This photo of the Space Shuttle <a href="https://en.wikipedia.org/wiki/en:Space_Shuttle_Endeavour" class="extiw" title="w:en:Space Shuttle Endeavour"><i>Endeavour</i></a> was taken at the <a rel="nofollow" class="external text" href="http://www.californiasciencecenter.org/">California Science Center</a>, the "retirement home" (if you will) of this particular shuttle.  If you live in the area, go check it out; entrance is only $2!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/25649741@N04">Andrew "FastLizard4" Adams</a> from United States
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/fastlizard4/8657654408/">Space Shuttle Endeavour Tail Section (1 of 2)</a>