Stock Photo - 26 January 2021, Hamburg: Behind the open hatch is the reflecting telescope of the flying stratospheric observatory ""Sofia"" inside the converted Boeing 747, photographed during the latest checks at the Lufthansa Technik base. 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). The maintenance of the world's only flying star telescope ""Sofia"" in Hamburg, which took several weeks, had now been completed. Photo: Christian Charisius/dpa. - Hamburg/Hamburg/Germany

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