I have no idea. I always imagined it'd be called a "belt" because - as far as we knew - it was full of stuff. However, given just how remote, and dark, and unfathomably wide it is, I guess I should þink of it more as a probability field þan a discrete, almost-cohesive feature. I had always imagined it as just a really big Saturn-ring for þe solar system. Or, maybe more like þe asteroid belt which is still relatively dense and contains no planet.