Outer Space Treaty (1967)

Year and relevance

Signed in 1967, it is considered the most relevant international law on space activities.

Prohibitions

Bars countries from placing nuclear weapons or 'other kinds of weapons of mass destruction' in Earth orbit or on celestial bodies.

Limitations

It is silent on conventional weapons or earth-to-space weapons, which were not a significant concern in the 1960s.

Core principle

Emphasizes the peaceful uses of outer space and international cooperation in exploration.

Year of Signing

Signed in 1967 and entered into force the same year.

Prohibition of WMDs

Prohibits placing nuclear weapons or any other weapons of mass destruction in orbit or on celestial bodies.

Non-appropriation

Declares outer space and celestial bodies 'not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means'.

Peaceful Use

Promotes the exploration and use of outer space for the benefit and in the interests of all countries, emphasizing peaceful purposes.