Here on Earth, we're used to the idea of land ownership. A piece of land belongs to someone, whether that's an individual, a company, or a state, and the owner has rights over what is done with that land. But what about the Moon? Who owns that?
The Outer Space Treaty of 1967, put forward by the United Nations, says that space belongs to no one country. Countries might plant their flags there, but this is a symbolic gesture rather than a proof of ownership.
However, there is increasing interest in mining the Moon for resources. Although no company or state has tried this yet, it's only a matter of time before people rush to claim a piece of the celestial body.
NASA recently announced it would be inviting private companies to test out plans for mining ice on the Moon, while also sharing plans for what lunar mining could involve in the future. The legality of this might be complicated, so we'll have to wait and see how the world's countries deal with complex issues of ownership in outer space.