When a space shuttle is mated to a shuttle carrier aircraft (SCA) for transport between space centers, a tail cone is installed over its main engines. This reduces both drag and turbulence created by the piggy-backing spacecraft while also protecting the engines. Discovery's final tail cone was installed in the Orbiter Processing Facility (OPF) for her flight from Florida to Virginia and display at the Smithsonian.

Credit: Gigapan by Jon Brack

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