The aim of this article is to show that the activities of the European Space Agency contribute significantly to the security of the European Union. What was required to develop space potential and to start using it for security purposes was the political and programmatic evolution of both organizations. The original objectives for which the European Space Agency was established were not related to security. Before the ESA became an organization with important implications for the security of the EU, it was an intergovernmental organization exclusively dedicated to the exploration and exploitation of space for peaceful purposes. The paper assumes that in order for this evolution to be possible, both the ESA and the EU had to find and/or deve...