If there is no multiverse then what is beyond the Universe?

[multiversetheory]

I have been trying to think if there is no multiverse and the universe is not infinite than what is on the outside?

 

[PeroK]

There would be no outside. The universe, by definition, would be all there is.

 

[multiversetheory]

oh thank you

 

[Greg Bernhardt]

Here is a little primer on this
https://www.livescience.com/33646-universe-edge.html

 

[Klystron]

I have been trying to think if there is no multiverse and the universe is not infinite than what is on the outside?

If you are interested in the multiverse hypotheses, the link contains arguments pro and con plus many interesting books and articles at the level of this thread.