Suppose there were dilithium crystals on Pluto that we didn't know about, and anyway we don't have the technology to go out and mine Pluto. Does that mean that an alien superpower can come to our solar system, set up operations, and take what they want? In "Mudd's Women" there are humans working a stake on Rigel XII. But in other episodes we learn there are people on Rigel II (Shore Leave), Rigel IV (Wolf in the Fold), Rigel V (Journey to Babel), and Rigel VII (The Cage). So it appears that humans from the Federation surveyed and prospected the outer reaches of the Rigel system and found something they wanted. And they're taking it. On the one hand, you'd think that a solar system belongs to whoever evolved there. But on the other hand, if native people have no way of reaching a natural resource, they can't make or defend a claim. And the people from elsewhere who do reach the untouched wilderness of a solar system, must do so by expending considerable resources of their own. They have to invest and risk a lot of capital to travel across the stars, build mines, and transport the minerals back to "civilization" where they are worth something and add to the wealth of the galaxy. Out where no one has ever gone in a solar system, and no property lines have been drawn, doesn't nature belong to everybody, and thus mineral rights should go to those who can develop them and make something productive out of them? Or do natives have an eternal first claim that stretches as far as their sun's gravity can hold the lands, even if they never develop space travel?