Stock Photo - 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 Stratospheric Observatory for Infrared Astronomy (Sofia) is a Boeing 747 converted into a flying telescope by the US space agency Nasa and the German Aerospace Center (DLR). It has been undergoing maintenance at the Lufthansa Technik base in Hamburg in recent weeks. Photo: Christian Charisius/dpa. - Hamburg/Hamburg/Germany

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