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RT @ESA_History: #OTD 30 May 1975 the #ESA Convention is signed, creating the European Space Agency http://www.esa.int/About_Us/Welcome_to_ESA/ESA_history/Forty_years_of_the_ESA_Convention https://t.co/58… source: https://twitter.com/esa/status/1001743880084250624