Re: Probably a dumb question ...

Yes, there is a boundary, on one side of which is everything that is
measurable and part of our universe and on the other "side" is that
which is not measurable and not part of our universe. The boundary is
present everywhere at the smallest scale. Our universe - physical
reality - is also part of this outside, an "area" if you like of
special conditions in this Nothingness, which is spiritual reality
(i.e. God). The interaction between both sides of the boundary is
spiritual.
But no, the universe is not expanding - that is merely an
interpretation of a fact (the redshift), not a fact itself.

.

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