26 January 2021, Hamburg: Behind the open hatch, the reflecting telescope of the flying stratospheric observatory "SOFIA" can be seen inside a converted Boeing 747 during final checks at Lufthansa Technik. The
SOFIA Upgrades: Integrating Telescope Onboard Command and Control Systems | NASA
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SOFIA flying observatory takes final flight | Astronomy.com
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NASA's Unique SOFIA Boeing 747SP Flying Telescope Is Done - FLYING Magazine