Jonathan wrote:
> Marco, in energetic terms, "closed" means that their is no input our
output of
> energy. There is no reason the system can't go on expanding in space.
>
What I would like to find out is *why* it is considered that there is no
input of energy; or, to be more precise, why such a possibility is
precluded. My suspicion is that this is a basic axiom of the physical
understanding of the cosmos (and completely reasonable in those terms) but
not necessarily one that is possible to be argued for (what would count as
evidence for it?). Or am I barking up the wrong tree?
Sam
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