Current Events > So if the universe is expanding and we will eventually have heat death

(+) Yeah! (+)

Tora_Sami posted...

Well I would think there is a difference between stagnant and stable though. Stabilization isn't stagnation. Things will still be moving, the universe just won't be expanding. But I think it will expand eternally it will just be at such a slow pace it may seem stagnant. Kind of like that effect that makes water look solid. New suns will always be created and new worlds will be eternally formed. Then maybe, maybe, one day the universe will contract until it explodes again, renewing materials and worlds and suns in a endless cycle of life. It's possible that we are in the first cycle or we could be in the bajillions.

You don't understand what the heat death of the universe is. The ability to do anything is predicated on the ability to do work, and that ability to do work is predicated on energy, potential or kinetic, being higher in some places than others. Every time energy is used, a little bit of it is lost to the environment, and it would take more energy to return to the initial state than it took to leave it. The second law of thermodynamics, which is probably more ironclad as a rule than gravity, states that this happens for every process and it is irreversible. The heat death of the universe is the point where no more work can be done because energy is distributed completely identically everywhere. Every time you do anything, whether it's walking, talking, or breathing, you ever so slightly accelerate the heat death of the universe.

Foppe posted...

It is expanding because we are stuck in a black hole without realizing it.

being stuck in a black hole would make us do the exact opposite of expanding though, we'd be pulled into the black hole, not moving away from it

That cat from Madoka was right

Strider102 posted...

It keeps expanding until molecules also expand, and then everything keeps expanding until there's nothing left to expand and everything just poofs out of existence.

That doesn't makes sense, what would happen to gravity that would allow currently form bodies to separate? My understanding was that all stars would burn out and all black holes would evaporate and there would be no heat sources so everything would just cool to absolute zero.

From Wiki: https://en.wikipedia.org/wiki/Heat_death_of_the_universe
The heat death of the universe (also known as the Big Chill or Big Freeze)[1][2] is a hypothesis on the ultimate fate of the universe, which suggests the universe will evolve to a state of no thermodynamic free energy, and will therefore be unable to sustain processes that increase entropy. Heat death does not imply any particular absolute temperature; it only requires that temperature differences or other processes may no longer be exploited to perform work.

I love the theory of the White Hole. Which theoretically could exist. And our Big Bang could be an example of a white hole that is an entire universe/black hole on the other side.

luigi33 posted...

I love the theory of the White Hole. Which theoretically could exist. And our Big Bang could be an example of a white hole that is an entire universe/black hole on the other side.

So that Family Guy joke was right

https://youtu.be/l4Wbb1cqubo?si=4agB_LAs93MEIhAk

Garioshi posted...

The second law of thermodynamics, which is probably more ironclad as a rule than gravity,

If someone points out to you that your pet theory of the universe is in disagreement with Maxwell's equationsthen so much the worse for Maxwell's equations. If it is found to be contradicted by observationwell, these experimentalists do bungle things sometimes. But if your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.

- Arthur Eddington

just saw this and it reminded me of this topic:

https://m.youtube.com/watch?v=71eUes30gwc

https://youtu.be/uD4izuDMUQA?si=NWOOVvp490sdLKQo

Pikachuchupika posted...

https://www.youtube.com/watch?v=71eUes30gwc

Kurzgesagt comes out with this video just in time for this topic :p

Very interesting

Mother Black hole eating matter = Expanding daughter universe dark energy

CruelBuffalo posted...

Will it come to a point where the universe starts to contract back into a singularity?

Does this then reset the universe? Has this been going on for trillions of years?

A couple things here. The OP is roughly a version of the "big crunch" theory which has been disproven since the 90s at least.

The universe is expanding, and that expansion is accelerating (i.e. it's expanding faster and faster). We call the thing that causes this "dark energy"--the force of empty space expanding.

Eventually all the protons, neutrons, and other particles will decay into heat. Black holes will decay through Hawking radiation and they too will evaporate. Then the universe will be truly "dead."

However, because of quantum foam, eventually, the universe will restart itself anyway. We aren't talking in billions of years, more like 10^10000000000000000000000000000 years. A stupidly long time.