text: I like "builders rubble" I don't think I can top that.\n\nBut I can tell you that as soon as you leave the universe, time stops (because you've left space time) and normal laws of physics break down. So as you headed outward, first you'd blow by the last bit of radiation into very high energy vacuum state that would probably rip every molecule in you to shreds, but if you could find someway to avoid that and acutally hit the end of space time you'd be unable to move because you can only change position along (x,y,z) over time. As soon as spacetime ended you'd come to a stop; the physics of movement would not work anymore. Within an imperceptible fragment of a second the edge of the universe would catch back up to you and you'd be sitting there wondering what happened (if you noticed anything at all). You could keep trying for an eternity but you'd never be able to leave or "see" anything because you're eyes and senses are biased to the physical stimuli of this universe, not the trans-dimensional stuff between universes. All you'd see is black.