Re: What's this universe that is expanding...

"Bob Cain" <arcane@xxxxxxxxxxxxxxxxx> wrote in message
news:dqchj5127bv@xxxxxxxxxxxxxxxxxxxxx
>
>
> T Wake wrote:
>
>> At t=10^-35 the universe could have been very, very small yet infinite in
>> size.
>

The key is, what is meant by infinite. :-) Its a mathematical concept more
than anything else, which is why it is often hard to transfer into reality.

In the very early universe (t=10^-35 for example) light could only have
travelled 1x10^-27 m. If the universe at this time was actually 10 m in
diameter and expanding at c, the energy released in the Big Bang would never
(ever) reach an edge making the universe functionally infinite.

Granted the problem with this approach is that it creates the possibility
for a "centre" of the universe which is against one of the basic principle
and in turn implies the universe isn't actually "infinite." But never mind.
:-)


.

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