Home2020 Treaties and Agreements ...European Space Agency (20-1027) – Memorandum of Understanding Concerning Cooperation on the Civil Lunar Gateway hide European Space Agency (20-1027) – Memorandum of Understanding Concerning Cooperation on the Civil Lunar Gateway TIAS Office of Treaty Affairs October 27, 2020 Space Signed at Darmstadt and Tulsa October 22 and 27, 2020; entered into force October 27, 2020. Download Agreement [4 MB] Tags European Space Agency Space Treaties