Enlargement of the European Space Agency
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The European Space Agency (ESA) was founded in 1975 when the European Space Research Organisation (ESRO) merged with the European Launcher Development Organisation (ELDO). The ESA Convention was signed by the ESRO and ELDO members on 30 May 1975 and by Ireland on 31 December 1975. Canada signed a Cooperation Agreement on 9 December 1978. The Convention entered into force on 30 October 1980 after the ratification procedures in the 10 ESRO/ELDO members were finalised.