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![]() Officially known as the Stratospheric Observatory for Infrared Astronomy, SOFIA is a heavily modified Boeing 747 Special Performance jetliner, with a 17-ton, 8-foot telescope mounted behind a 16-by-23-foot sliding door that reveals the infrared telescope to the skies. http://www.wired.com/2014/07/nasa-sofia-flying-observatory/ | |||||||||||||||||||||||