High Quality Content by WIKIPEDIA articles! The Outer Space Treaty, formally the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, is a treaty that forms the basis of international space law. The treaty was opened for signature in the United States, the United Kingdom, and the Soviet Union on January 27, 1967, and entered into force on October 10, 1967. As of October 2011, 100 countries are states parties to the treaty, while another 26 have signed the treaty but have not completed ratification.