http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f5-subject%3DLaunch%20Vehicle;f4-associated-Lesson%3DX-Ray%20History;f6-subject%3DSpace%20Shuttle Results for your query: expand=subject;f5-subject=Launch Vehicle;f4-associated-Lesson=X-Ray History;f6-subject=Space Shuttle Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Space_Shuttle/Space_Shuttle.dc.xml As humanity's first reusable spacecraft,NASA's space shuttle fleet began setting records with its first launch on April 12, 1981. Starting with Columbia and continuing with Challenger, Discovery, Endeavour, and Atlantis, the shuttle has carried people into orbit repeatedly, and launched, recovered and repaired satellites. The final space shuttle mission, STS-135, ended July 21, 2011 when Atlantis rolled to a stop at its home port, NASA's Kennedy Space Center in Florida. A sixth shuttle, Enterprise, was used for testing, but never flew in space. Two shuttles failed and crashed in flight, but the remaining four shuttles are on display at public viewing sites around the country. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Space_Shuttle/Space_Shuttle.dc.xml Thu, 01 Jan 1970 12:00:00 GMT