Re: if the big bang reverses will all the toothpaste eventually go back in its tubes? and then the tubes disappear.


Timberwoof wrote:
> In article <1137055142.730842.154310@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
> "rev.goetz" <jimgoetz316@xxxxxxxxx> wrote:
>
> > ck19bla@xxxxxxx wrote:
> > > if the big bang reverses and eventually goes back to no bang, is all of
> > > history erased like it never happened at all? 1+0=0. does everything
> > > (matter,anti-matter, light waves,thoughts,dreams. ect ect.) not only
> > > doesn't exist but never existed in the first place. what
> > > happens???????????
> >
> > First of all, measurements from the last couple of decades show that
> > the clusters of galaxies will continue to expand indefinitely. And this
> > will result in all galaxies crunching into galactic or multi-galactic
> > black holes.

> What? You seem to have contradicted yourself. If the galaxies expand, why woudl
> they contract into black holes? That makes no sense.

Space is sparse enough that most galaxies have minimal gravitational
influence on other galaxies. At the current estimates for how
intergalactic
space is expanding, the expansion rate exceeds attractive potential
so that the fates of most galaxies are independent of other galaxies.

Within a galaxy, the density of matter is relatively high such that
for much of the matter, gravitational collapse may be predicted.
I'm not entirely sure about this though. To the extent it is true,
the bulk of matter within a galaxy sinks into a central black hole.
Of course, those black holes may evaporate too.

> > On the other hand, if those calculations of those
> > measurements are wrong, then eventually all galaxies will crunch
> > together into a single universal black hole. But even if the latter
> > turns out to be true, time will not reverses itself while the universe
> > contracts. For example, if I had the power to make the galaxies of the
> > universe contract instead of expand, nothing would change in our
> > day-to-day life except various measurements in astrophysics.

> uh...

There is a strange notion that the 2nd law of thermodynamics
is tied to the arrow of time and an expanding universe. This
is, in a very oversimplified way related to the time symmetry
observed in many equations of physics. The trajectory of
a cannon ball following a parabolic arc works if you run time
forwards or backwards. Accordingly, some project that the
universe would run backwards if it were collapsing instead
of expanding. A corollary to this is that it is collapsing and
we are experiencing time in a backwards manner.

It all makes much more sense with black lights, psychedelic
posters of Jimi and some herb and very little otherwise.

.

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