Property rights are kind of weird. When you own a piece of land, what do you own? How do you figure out what land you own in the future? What if there’s an earthquake, and the land shifts? What about continental drift? Do your property lines drift in the opposite direction by a few centimeters relative to the ground every year? We conveniently ignore these questions.
What about space? Suppose you owned a region of space. An unmoving region of space. Wait, what? All regions of space move. Our galaxy is moving and stars are orbiting the center of the galaxy (and rearranging themselves) at not exactly the same speed. Suppose you own an asteroid and all airspace within 3 light years, and some other guy does too. Your asteroids fly past one another. Your properties overlapped! This is a bit contradictory. How would we develop a system of describing property rights for regions of space?