> As I understand it, there isn't, from the perspective of an observer external to the event horizon. This is not correct. An observer outside the horizon cann

> As I understand it, there isn't, from the perspective of an observer external to the event horizon. This is not correct. An observer outside the horizon cannot see anything at or inside the horizon; but that doesn't mean he can't calculate that there is a region of spacetime inside the horizon, from observations he can make from the outside. He can.