Vladimir Komarov's remains in an open casket RIA Novosti/Photo Researchers Inc. hide caption

itoggle caption RIA Novosti/Photo Researchers Inc.

This concept illustration for the Kennedy Space Center Visitor Complex shows how a space shuttle might be displayed, if NASA decides to award one to the facility. PGAV Destinations/Kennedy Space Center hide caption

itoggle caption PGAV Destinations/Kennedy Space Center

Space shuttle Discovery ended its 39th and final mission to space Wednesday, touching down at Kennedy Space Center in Cape Canaveral, Fla., just before noon local time. John Raoux/AP hide caption

itoggle caption John Raoux/AP

Educators at the National Museum of the U.S. Air Force teach students about spaceflight. The museum is one of many vying to display a space shuttle. Dan Patterson/National Museum of the U.S. Air Force hide caption

itoggle caption Dan Patterson/National Museum of the U.S. Air Force