Stock Photo - 26 January 2021, Hamburg: The reflecting telescope of the flying stratospheric observatory ""Sofia"" inside the converted Boeing 747, taken during the last 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 stellar telescope ""Sofia"" in Hamburg, which lasted several weeks, has now been completed. Photo: Christian Charisius/dpa. - Hamburg/Hamburg/Germany

Stock Photo: 26 January 2021, Hamburg: The reflecting telescope of the flying stratospheric observatory ""Sofia"" inside the converted Boeing 747.

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