Greenland… Canada… Mars – why not?!

Article II of the 1967 Outer Space Treaty [OST] explicitly states that outer space, including Mars, “is not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means”.
The OST has been ratified by all major spacefaring nations, including the US, the UK, and Russia. How enforceable is that likely to be?!






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