There is no "beyond" the end of the universe,
assuming that there is an end to it at all. In Big
Bang cosmology, time ends when the universe
collapses. Not only does the universe no longer
exist, but time no longer exists so there is not
"after" the end of the universe.
This is a subtle and difficult question. Our
simple models of the universe, which agree with
all observational data now known, have no actual
edge or "end" to the universe. Space is either
infinite in extent, or it might curve back around
onto itself, like the surface of a sphere or
perhaps a torus. However, many theories of the
origin of the universe postulate a period where
there was incredible inflation of space which
became our universe.
The universe beyond the
region that inflated might be VERY different from
our universe, with different laws of nature.
Unfortunately, as far as we can tell, we cannot
observe this region because there has not been
enough time for light to travel to us from this
region during the age of the universe.
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