Re: OT: Agnoticism (WAS: Making money from Java)



"Howard Brazee" <howard@xxxxxxxxxx> wrote in message
news:0b85r157lipsmptcr4vmih3oik3n8hu7qb@xxxxxxxxxx
> On Thu, 29 Dec 2005 01:58:21 +1300, "Pete Dashwood"
> <dashwood@xxxxxxxxxxxxxx> wrote:
>
>>> Please describe what you mean when you say "space curves back on
>>> itself".
>>>
>>It isn't so much that "space curves back on it itself"; rather that space
>>itself is (roughly) spherical (and expanding...). Anything emanating from
>>a
>>point on the "edge" of it will eventually describe a great circle and
>>return
>>to the point where it originated (given all the things required to allow
>>this to happen..)
>
> It is expanding - and there are galaxies which are far enough away
> from us that their current light will never reach us (we see them from
> when the universe was smaller). People have played with the idea
> that light from an object will eventually make it back to that object
> after going around the universe, but have found no evidence to support
> this idea.

There may be no real evidence (it is pretty difficult to set up an
experiment that will take around 15 billion years to confirm or deny :-)),
but there is a considerable amount of theory to suggest that such may be the
case.

Given that a photon has infinite time (being massless, it can travel at the
speed of light and time therefore stops for it), it will, (according to
Feynmann), cover every possible path in the universe. This includes the one
which takes it back to where it originated. Of course, many things can
happen to a photon in infinite time; one of them could be popping out of
existence due to quantum field fluctuations... or it could be absorbed into
another particle and never emitted... there are many reasons why it might
not arrive back where it started from, but it certainly cannot be proven
that it won't, if nothing untoward happens to it.

Pete.



.

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