The short version

• The Outer Space Treaty is about 2,500 words long, entered into force on 10 October 1967, and had 118 states parties as at 1 January 2026.
• Six articles do almost all the work: I, II, VI, VII, VIII and IX.
• Article VI is the commercial one. It makes states answerable for their companies, which is why licensing regimes exist.
• The treaty settles almost nothing about resources, debris, traffic or brightness. That is not a drafting failure. Those problems did not exist in 1966.

Most explanations of the Outer Space Treaty start with the phrase “province of all mankind” and end with a vague gesture at peaceful use. That is the ceremonial reading. The working reading is narrower and more useful, because six of its seventeen articles carry essentially all the legal weight.

The treaty was adopted by UN General Assembly resolution 2222 (XXI) on 19 December 1966, opened for signature in London, Moscow and Washington on 27 January 1967, and entered into force on 10 October 1967. It was negotiated in about eighteen months by two superpowers who both wanted to stop the other one claiming the Moon.

Here is what each of the load-bearing articles actually does.

Article I: freedom of use, for everyone

Exploration and use of outer space shall be carried out for the benefit and in the interests of all countries, and outer space shall be free for exploration and use by all states without discrimination.

Two practical consequences. First, there is no permission requirement in international law to go to space. You do not apply to anyone. Second, “use” is a protected activity and it is broad. The argument that extracting resources is a form of “use” protected by Article I starts here.

The “province of all mankind” phrase sits in this article. It is aspirational language, not a property rule. It has never been read as creating a common heritage regime, which is precisely what the Moon Agreement tried to add twelve years later and why so few states joined it.

Article II: the non-appropriation rule

Outer space, including the Moon and other celestial bodies, is not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means.

Outer Space Treaty, Article II

One sentence, and the most litigated sentence in the field despite never having been litigated.

Note what it covers. It prohibits appropriation of the place. It says nothing explicit about material removed from that place. The drafters were worried about territorial claims of the kind that carved up Antarctica and Africa. They were not thinking about regolith processing.

That silence is the crack that four national space resources laws and Section 10 of the Artemis Accords have grown into. We set out both sides of that argument in our piece on space resources.

The other thing to notice is the phrase “by any other means”. Critics of the resources position lean on it hard. If a company operates an exclusive mining site for twenty years under a national licence, they argue, that is occupation dressed up in commercial clothing, and the Accords’ safety zones concept makes the exclusivity explicit.

Article VI: the article that pays your fees

States parties bear international responsibility for national activities in outer space, whether carried on by governmental agencies or by non-governmental entities, and the activities of non-governmental entities require authorisation and continuing supervision by the appropriate state party.

This is the hinge between international law and commercial practice.

A private company is not a party to the treaty and cannot be. So the treaty makes the state responsible for private conduct, and then requires the state to authorise and supervise it. Every national licensing regime in existence is a state discharging that obligation.

Note “continuing supervision”. The obligation does not end at grant. It is why licences carry ongoing conditions, reporting duties and end-of-life requirements, and why the FCC could treat DISH’s disposal plan as an enforceable licence condition years after the satellite launched.

Article VII: liability, in outline

Each state party that launches or procures the launching of an object into outer space, and each state party from whose territory or facility an object is launched, is internationally liable for damage caused by that object.

Four categories of launching state, and they can all be liable for the same object. A satellite built in Germany, procured by a Luxembourg company, launched from French Guiana on a US vehicle can implicate several states at once.

Article VII is the outline. The 1972 Liability Convention fills in the detail, splitting damage into absolute liability on the surface of the Earth and fault liability everywhere else.

Article VIII: jurisdiction follows registration

The state of registry retains jurisdiction and control over the object and any personnel on it, and ownership of objects is not affected by their presence in outer space or by their return to Earth.

This does two useful things. It supplies the connecting factor for criminal and civil jurisdiction on board, which is how the Intergovernmental Agreement on the Space Station allocates jurisdiction module by module. And it confirms that a satellite remains the property of its owner while in orbit, which is the foundation for satellite financing, security interests and salvage arguments.

The 1975 Registration Convention builds the machinery: launching states file object data with the UN Secretary-General. It has 77 parties, and compliance is patchy for smallsats.

Article IX: due regard, contamination and consultation

States shall conduct activities with due regard to the corresponding interests of other states, shall avoid harmful contamination of space and adverse changes in the Earth’s environment, and shall consult before proceeding with an activity that would cause potentially harmful interference.

Article IX is the closest the treaty comes to an environmental provision, and it is doing a lot of unglamorous work in modern debates. Debris mitigation guidelines, planetary protection policy and the dark and quiet skies argument all cite it.

Its weakness is that “due regard” and “potentially harmful interference” are undefined, and the consultation mechanism has never been formally triggered by one state against another over a constellation.

What the treaty does not do

It is worth being blunt about the gaps, because a lot of commentary pretends they are not there.

None of this makes the treaty a failure. It has held for nearly sixty years across a Cold War, the collapse of one of its two authors and the arrival of an industry its drafters could not have imagined. But it is a framework, and frameworks need floors built under them. Most of the interesting legal work in space today is that floor building, happening in national rulemaking and in COPUOS working groups rather than in treaty negotiation.