The law has always had a problem with altitude. Here on Earth, we can draw neat little lines on a map and call them borders. We can assign them to taxing authorities and know who collects what. But the higher you go, the fuzzier things get. Airspace law is still a little like a neighborhood feud about where the fence belongs, except the “fence” is somewhere above the clouds. And if we can’t agree on who controls the sky, how do we decide who gets to tax outer space?