This question already has an answer here:
We all know that the universe is expanding at an accelerated rate and it might appear much like a soap bubble. That is where the phrase dark energy whose essence is unknown and which is thought to have caused this comes from. But that is not what this question is really about. If we could stand at the very edge of the expanding universe...
- What would we see just outside of it? Pure blackness or other expanding bubbles of multiverses?
- How about at the very edge? Would there be a membrane of some kind?
- What about at the inside of the edge? Of course this last question is easy to tackle because we would just see our own universe.