How far outside of this solar system have you traveled, Jon? I'm thinking not very far. Do you have photographs of this "pure nothingness" you speak of? I'm willing to bet a great deal of money that you don't. You have no more clue as to whether the universe continues on infinitely or if it does have a tangible end. You've got a cule little Invader Zim avatar (Gir is the best character anyway), but it makes you no less enlightened about the layout of our universe.