Hi Jonathan,
I also have problems to accept universe as a closed system. And not because of
the possibility of multiple universes. Let me try a simple consideration.
I've heard that the system is expanding, so IMO it is not closed. Let's admit
that the total amount of energy is constant: if the system will go on expanding
forever, the density of universe will always go on decreasing.
In this situation, the limit of entropy should decrease, also... or not? I
mean: the expansion of universe will continuously insert in the universe a new
portion of universe that is less warm than the *old* universe.
That is, entropy can't be reached.
It seems too easy. Tell me where I'm wrong. :-)
Marco
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