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.
Answer
What would we see just outside of it? Pure blackness or other expanding bubbles of multiverses?
Outside our particle horizon we assume that everything is more or less the same like where we are, at least if the assumption of homogenity and isotropy holds. If we live in a multiverse there might also be other laws of nature beyond or horizon, but there is no way to really test this. Anyway, more speculations on this can be found here and here.
How about at the very edge?
The universe has no edges. If it is finitely curved you always get back to where you started from when you move in a straight line (except if superluminal expansion confines you to a horizon smaller than the cirumference of you dimension).
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