The Outer Space Treaty

po_Treaty-Outer-SpaceThe 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 27 January 1967, and entered into force on October 10, 1967. As of May 2013, 102 countries are parties to the treaty, while another 27 have signed the treaty but have not completed ratification.