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Varlex t1_iuf2ozm wrote

There are 2 possible options.

a. The expansion of the universe reverse at a certain point

B. It will expand for ever

A. In this case, the universe fall back into a new singularity.

B. The universe will be more and more cold and the distances between objects increase and the black holes and dust stay for itself. (So galaxies, maybe cold still exist as more and more single objects, because the gravity can't hold more objects together)

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Varlex t1_iuf4sy7 wrote

In addition to B)

You can still have planet, dead suns and other stellar objects in a galaxy, as long it has a stable orbit.

But like other mentioned, hawking radiation is a topic. When background radiation will be smaller then hawking radiation from a big black holes, it loses energy = mass. Because it loses mass, the orbit from all objects around will increase. So in a long long long future it could be, that galaxies disband and only some single solar systems with dead suns exists...

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trunktunk OP t1_iuf46a6 wrote

For the first point when it reverses, do you mean like it’ll un do everything that happened?

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tvalvi001 t1_iuf5ir9 wrote

Rather than an undoing, it’ll be more of a crunching together of all in the universe into one big piled up ball of everything

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trunktunk OP t1_iuf6k14 wrote

Woah, that’s crazy to think about. So it’d like get smaller?

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tvalvi001 t1_iuf6xv1 wrote

Theorists have it that it’ll crunch down to a single point in the same way the Big Bang occurred, or something like it. This used to be a very popular theory but I guess over the years many astrophysicists have gone on to ponder other possibilities, but I’m not intelligent enough to understand them lol

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Varlex t1_iuf8myr wrote

It depends, and currently we can't measure it with enough accuracy.

Most of the scientists thinks a big chill will happen (the universe will be more could from time to time).

I read more, it could be, when the temperature is more next to 0K also atoms will disintegrate into photons and electrons.

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tvalvi001 t1_iufa6lk wrote

Just for clarity, when you wrote 0K you meant 0 kelvin?

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Varlex t1_iufc523 wrote

Yes.

And you know the 2. Law of thermodynamics. So atoms will lose their energy and disintegrate after some times.

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tvalvi001 t1_iufd4j9 wrote

That makes the whole “Big Chill” a lot more clear now. It makes sense that it’d be more plausible too

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TheDinoIsland t1_iuffie4 wrote

The big bang/crunch seems to make the most sense. It kinda provides an answer to why we exist. This could be our trillionth life and we would never know it.

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Varlex t1_iuf7f5i wrote

No, the distance between objects in stellar will be smaller. The expansion or the opposite doesn't matters a lot for us.

Currently the room between all objects increase, also between sun and earth. But the gravity can easily hold it together.

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Varlex t1_iuf5byv wrote

From what i know, this will not happen.

Time is still a vector which is ongoing, where the room will be smaller from time to time.

Then gravity force objects into each others and the energy density increase, so the universe will heat up.

At a certain point it's so hot, matter don't exist and it falls into its subparticels.

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Varlex t1_iuf5tmp wrote

>Time is still a vector which is ongoing, where the room will be smaller from time to time.

In addition to this. The universe could be still infinite, but it's smaller then before ;)

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whativebeenhiding t1_iuffjye wrote

I just read a book that talked about seven ways the universe could end. The End of Everything: Astophisically Speaking

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