It’s an interesting subject. There is a Moon Treaty to which the UK is a signatory, but it is a product of Cold War thinking, in that only bans nation states from claiming ownership of the Moon or parts of it, it does not prevent businesses based in those states from exploiting the Moon. How can you exploit something you do not own? It is a situation analogous to that with the deep oceans, which are not owned by states, but can be exploited. However there is an international mechanism to regulate that (not without controversy). There is no mechanism at all for the Moon.
This is all a rather different subject to light pollution, however, which is a fairly local issue, within the remit of national and local governments to deal with, if they care.
Incidentally, I don’t think it is a good idea to have a thread in the forum called ‘General’. Threads should be specific to the topics they are concerned with. What you have tried to do here is create a thread for what should be a forum sub-category. I don’t know if we actually can have sub-categories in this forum though.