members - (12) Austria, Belgium, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain; note - Denmark, Sweden, and UK decided not to join
European Organization for Nuclear Research (CERN): note - acronym retained from the predecessor organization Conseil Europeenne pour la Recherche Nucleaire
established - 1 July 1953; effective - 29 September 1954
aim - to foster nuclear research for peaceful purposes only
members - (20) Austria, Belgium, Bulgaria, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, UK
observers - (7) European Commission, Israel, Japan, Russia, Turkey, United Nations Educational, Scientific, and Cultural Organization (UNESCO), US
European Space Agency (ESA): established - 31 May 1975
aim - to promote peaceful cooperation in space research and technology
members - (15) Austria, Belgium, Denmark, Finland, France, Germany, Ireland, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UK
cooperating state - (1) Canada