Look up at the night sky and you'll see stars. What you won't see is the junk: thousands of dead satellites, spent rocket stages, and stray bolts and paint flecks, all zipping around the Earth at speeds fast enough to turn a fleck of metal into a bullet. This is space debris, and it's becoming one of the quiet crises of our time. On Earth, when a factory dumps waste into a river, we have a simple, powerful idea to deal with it: the polluter should pay. It's called the "Pollut