Outer Space Treaty

Outer Space Treaty
Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies
  Parties
  Signatories
  Non-parties
Signed27 January 1967
LocationLondon, Moscow and Washington, D.C.
Effective10 October 1967 (1967-10-10)
Condition5 ratifications, including the depositary Governments
Parties117[1][2][3][4]
DepositaryGovernments of the United Kingdom of Great Britain and Northern Ireland, the Union of Soviet Socialist Republics and the United States of America
LanguagesEnglish, French, Russian, Spanish, Chinese and Arabic
Full text
Outer Space Treaty of 1967 at Wikisource
International ownership treaties
Extraterritorialities
Earth
Space
  • Extraterrestrial real estate
  • Moon Treaty

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 multilateral treaty that forms the basis of international space law.

Negotiated and drafted under the auspices of the United Nations, it was opened for signature in the United States, the United Kingdom, and the Soviet Union on 27 January 1967, entering into force on 10 October 1967. As of May 2025, 117 countries are parties to the treaty—including all major spacefaring nations—and another 22 are signatories.[1][5][6]

Key provisions of the treaty include prohibiting nuclear weapons in space; limiting the use of the Moon and all other celestial bodies to peaceful purposes; establishing that space shall be freely explored and used by all nations; and precluding any country from claiming sovereignty over outer space or any celestial body. Although it forbids establishing military bases, testing weapons and conducting military maneuvers on celestial bodies, the treaty does not expressly ban all military activities in space, nor the establishment of military space forces or the placement of conventional weapons in space.[7][8]

The OST also declares that space is an area for free use and exploration by all and "shall be the province of all mankind". Drawing heavily from the Antarctic Treaty of 1961, the Outer Space Treaty likewise focuses on regulating certain activities and preventing unrestricted competition that were thought might lead to conflict at that time.[9] Consequently, it is largely silent or ambiguous on newly developed space activities such as lunar and asteroid mining.[10][11][12]

OST was at the heart of a 'network' of inter-state treaties and strategic power negotiations to achieve the best available conditions for nuclear weapons world security.

OST was the most important link in the chain of international legal arrangements for space from the late 1950s to the mid-1980s. The OST was followed by to four additional agreements, with varied levels of accession: the safe return of fallen astronauts (1967); liability for damages caused by spacecraft (1972); the registration of space vehicles (1976);and rules for activities on the Moon (1979).[13] As the first and most foundational legal instrument of space law,[14] the Outer Space Treaty and its broader principles of promoting the civil and peaceful use of space continue to underpin multilateral initiatives in space, such as the International Space Station and the Artemis Program.[15][16]

  1. ^ a b "Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies". United Nations Office for Disarmament Affairs. Retrieved 16 September 2017.
  2. ^ Cite error: The named reference UK was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference US was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference RU was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference unodacn was invoked but never defined (see the help page).
  6. ^ In addition, the Republic of China in Taiwan, which is currently recognized by 11 UN member states, ratified the treaty prior to the United Nations General Assembly's vote to transfer China's seat to the People's Republic of China (PRC) in 1971.
  7. ^ Shakouri Hassanabadi, Babak (30 July 2018). "Space Force and international space law". The Space Review. Retrieved 22 May 2019.
  8. ^ Irish, Adam (13 September 2018). "The Legality of a U.S. Space Force". OpinioJuris. Retrieved 22 May 2019.
  9. ^ Cite error: The named reference US_DOS_OST was invoked but never defined (see the help page).
  10. ^ If space is ‘the province of mankind’, who owns its resources? Senjuti Mallick and Rajeswari Pillai Rajagopalan. The Observer Research Foundation. 24 January 2019. Quote 1: "The Outer Space Treaty (OST) of 1967, considered the global foundation of the outer space legal regime, […] has been insufficient and ambiguous in providing clear regulations to newer space activities such as asteroid mining." *Quote2: "Although the OST does not explicitly mention "mining" activities, under Article II, outer space including the Moon and other celestial bodies are "not subject to national appropriation by claim of sovereignty" through use, occupation or any other means."
  11. ^ Szoka, Berin; Dunstan, James (1 May 2012). "Law: Is Asteroid Mining Illegal?". Wired. Archived from the original on 12 May 2014.
  12. ^ Who Owns Space? US Asteroid-Mining Act Is Dangerous And Potentially Illegal. IFL. Accessed on 9 November 2019. Quote 1: "The act represents a full-frontal attack on settled principles of space law which are based on two basic principles: the right of states to scientific exploration of outer space and its celestial bodies and the prevention of unilateral and unbriddled commercial exploitation of outer-space resources. These principles are found in agreements including the Outer Space Treaty of 1967 and the Moon Agreement of 1979." *Quote 2: "Understanding the legality of asteroid mining starts with the 1967 Outer Space Treaty. Some might argue the treaty bans all space property rights, citing Article II."
  13. ^ Buono, Stephen (2 April 2020). "Merely a 'Scrap of Paper'? The Outer Space Treaty in Historical Perspective". Diplomacy and Statecraft. 31 (2): 350-372. doi:10.1080/09592296.2020.1760038. S2CID 221060714.
  14. ^ "Space Law". www.unoosa.org. Retrieved 24 September 2021.
  15. ^ "International Space Station legal framework". www.esa.int. Retrieved 24 September 2021.
  16. ^ "NASA: Artemis Accords". NASA. Retrieved 24 September 2021.
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