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arncore t1_j2ql8ob wrote

Reply to comment by Aseyhe in How do galaxies move? by modsarebrainstems

A bit late but I’ve pondered this question before and finally there’s a relevant thread to ask and maybe have an answer.

Does this mean that over time the denser regions become denser (attracting matter around them constantly) to the point where the entirety of the universe becomes a dense point which condenses into an infinitely massive black hole? Which then collapses and causes a big bang event.

What I’m saying for a while Ive been thinking that the big bang isn’t the creation event. There is no specific “creation” event. The universe expands and then shrinks recursively, forever over trillenia. When it shrinks all life is erased and then life restarts once big bang occurs and galaxies reform.

This is a very interesting relevant article:

https://www.scirp.org/journal/paperinformation.aspx?paperid=80777

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iwaslegit t1_j2qq5q3 wrote

In short, no, this has been proposed before.

The current rate of expansion of the universe would mean that the universe keeps expanding forever. There is not enough gravity/mass in the observable universe to make it collapse into itself.

Also, dark energy is increasing the expansion rate. The most likely scenario is called Heat Death.

What you described is normally referred as Big Crunch.

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enderjaca t1_j2rqeg2 wrote

>the entirety of the universe becomes a dense point which condenses into an infinitely massive black hole? Which then collapses and causes a big bang event.

While theoretically possible, we don't see enough observable evidence to support this.

Additionally, think of this. At what specific point of size/mass would a black hole actually "explode" into another Big Bang? As far as we know, each black hole that currently exists at any size or mass is already infinitely dense. Even if you combined all the matter in the Milky Way Galaxy into one black hole, it would still be an infinitely dense black hole, it can't get any more dense than it already is. It *would* become more massive and have a larger event horizon.

But there's nothing fundamentally different about a solar-mass size black hole and a galactic core black hole, aside from just being much much more massive. Again, as far as I'm aware.

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