Originally posted by PinkFloyd
Since the universe is expanding, there must be a point at which one could call the Edge of the Universe, right? Granted, that boundry would change every moment (since it's always expanding at a fantastic rate), but still, at a given point in time, one should be able to say "Right here IS the edge of the universe." My question is what is on the other side answer I've heard is some sort of parallel opposite universe. Anyone have a conjecture?
The anwser to your post is extremly simple.
Humans are interpreteting the world around us the best they can but when something is beyond their understanding they try to simplife it to be able to understand it. Just because we can't understand something for our tiny human perspective, it doesn't mean that it is complicated or abstract. I mean, what is 500 grams of grey mass compared to seemingly endless universe. Human mind automatically rejects what it can not understand, so if there is NOTHING beyond limits of universe, human mind can not imagine NOTHING existing. We think : Well, isn't nothing something ???! That is just your brain limit.
However, here is analogy that I'have read in one of my astronomy books :
Earth is endless, isn't it, I mean it has concrete, limited mass and size easily measured. However, from our perspective (ESPECIALLY before technological advancement in XX. century), WHERE ON HECK THE EARTH ENDS ? Earth is endless and still it is not big at all. You can walk until the end of your life, and you still won't find an edge.
Add another, third dimension, and you use this analogy to universal proportions.