The Outer Space Treaty designates outer space as the province of mankind and prohibits states from placing objects with nuclear weapons or other weapons of mass destruction into orbit. States are also prohibited from installing weapons on celestial bodies and on the Moon. Any other form of military development or activities is also banned, such as military bases and fortifications, weapon testing, and military maneuvers. There are no measures for compliance, but states must inform the UN Secretary-General, the public, and the international scientific community of activities covered in the Treaty.

Opened for Signature: 27 January 1967

Entry into force: 10 October 1967

Official Text: http://disarmament.un.org/treaties/t/outer_space/text

Status and Signatories: http://disarmament.un.org/treaties/t/outer_space

ACA Backgrounder: https://www.armscontrol.org/factsheets/outerspace