Home2010 Treaties and Agreements ...European Space Agency (10-628) – Agreement Concerning Cooperation on the Robotic Exploration of Mars hide European Space Agency (10-628) – Agreement Concerning Cooperation on the Robotic Exploration of Mars TIAS Office of Treaty Affairs June 28, 2010 Space Cooperation Agreement effected by exchange of letters at Paris and Washington June 22 and 28, 2010; entered into force June 28, 2010. Download attachment [483 KB] Tags European Space Agency Space Treaties