Wars, politics & history

Outer Space Treaty

27 January 1967

The Outer Space Treaty is the basis of international space law. It was opened for signature in London, Moscow and Washington in January 1967 and entered into force later that year. It states that space, including the Moon and other celestial bodies, is free for exploration and use by all states and is not subject to national appropriation by claim of sovereignty. The Moon and other bodies are to be used only for peaceful purposes, and nuclear weapons and other weapons of mass destruction may not be placed in orbit or on celestial bodies. States bear international responsibility for national space activities, including those of private companies, and are liable for damage they cause. More than a hundred states are parties, and the treaty is central to current debates on resource extraction on the Moon and asteroids.

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