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Old 27th September 2021, 11:16 AM   #41
HansMustermann
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A lot higher, actually. But if you're in a hurry, the big rip may come first.
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Which part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn" don't you understand?
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Old 27th September 2021, 05:06 PM   #42
Hercules Rockefeller
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Originally Posted by dann View Post
When is that? I seem to remember something about 200,000,000 years. Or was it only 200,000?
About 100,000,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000 years.
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Old 27th September 2021, 05:51 PM   #43
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Originally Posted by Hercules Rockefeller View Post
About 100,000,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000 years.
That's for black holes to evaporate.

From a human perspective, the universe will be effectively heat dead when the last stars burn out, which will be roughly on the order of a mere 1014 years. That time scale is still much longer than the current age of the universe (~1010 years), but it's a lot shorter than black hole evaporation time scales of around 10100 years. On the flip side, the burned out cores of stars may take over 101000 years to completely fuse into iron, which is even longer than the black hole evaporation timescale. And this may actually trigger a few supernova, which would also break the monotony.
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Old 27th September 2021, 06:52 PM   #44
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Originally Posted by arthwollipot View Post
I have this theory. The origin of the universe is a quantum fluctuation with a ridiculously low probability. Like, once in thousands of trillions of years. Yet, it occurs, and a universe is brought into being and starts to expand. Hundreds of trillions of years after that occurs, all matter and energy in the universe dissolves and dissipates, leaving nothing - not even something that can be called spacetime. Entropy is at maximum.

Then it happens again.
There’s a wonderful short story by Isaac Asimov that weaves a similar tale:

https://www.physics.princeton.edu/ph115/LQ.pdf

Well worth the time if you haven’t read it - it’s only 9 pages long.

Last edited by Fast Eddie B; 27th September 2021 at 07:16 PM.
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Old 27th September 2021, 07:26 PM   #45
arthwollipot
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Originally Posted by Gord_in_Toronto View Post
If you do do the math, there is probably a Nobel Prize in store for you.
I expect so, yes.

Originally Posted by Fast Eddie B View Post
There’s a wonderful short story by Isaac Asimov that weaves a similar tale:

https://www.physics.princeton.edu/ph115/LQ.pdf

Well worth the time if you haven’t read it - it’s only 9 pages long.
I am very familiar with The Last Question. Once in high school I adapted it to a sound and light show in which after the last lines were spoken, I lit a bank of floods pointed at the audience.

And I'd like to mention that that PDF is paginated incorrectly. Asimov intended, as he did sometimes, for the last few lines to be over the final page, so you couldn't read ahead and spoil the ending.
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Old 27th September 2021, 11:22 PM   #46
dann
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I was thinking of the time when the sun is supposed to get so hot that it becomes a problem for (at least human) life on Earth, not the heat death of the universe.
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Old 27th September 2021, 11:30 PM   #47
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Originally Posted by dann View Post
I was thinking of the time when the sun is supposed to get so hot that it becomes a problem for (at least human) life on Earth, not the heat death of the universe.
That's about a billion years. Which, since life on earth began about 4 billion years ago, means we're already about 80% of the way through the period during which the earth will be capable of supporting life.
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Old 27th September 2021, 11:38 PM   #48
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Originally Posted by dann View Post
When is that? I seem to remember something about 200,000,000 years. Or was it only 200,000?
A bit longer.
A brown dwarf lasts 100 trillion years I think.
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Old 28th September 2021, 05:12 AM   #49
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On the other hand, the big rip may be anywhere between 2.8 billion years in the future (as an absolute minimum) and never.
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Which part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn" don't you understand?
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Old 28th September 2021, 07:50 AM   #50
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Originally Posted by HansMustermann View Post
On the other hand, the big rip may be anywhere between 2.8 billion years in the future (as an absolute minimum) and never.
On on the other other hand, the Universe could just do a reset and end tomorrow.
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Old 28th September 2021, 08:03 AM   #51
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Personally, I think avoid the heat death of the universe.
Last year, 5 million people died of heat death, and that was just Earth.

https://www.theguardian.com/world/20...ng-study-finds
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Old 28th September 2021, 11:46 AM   #52
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Originally Posted by Gord_in_Toronto View Post
On on the other other hand, the Universe could just do a reset and end tomorrow.
Don't worry, I'm guarding the button.
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Old 28th September 2021, 12:02 PM   #53
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Originally Posted by shemp View Post
Don't worry, I'm guarding the button.
Shemp! Guarding the button? Like that makes me feel comfortable?

We are doomed I tell you. DOOMED!

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Old 28th September 2021, 12:42 PM   #54
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Originally Posted by Gord_in_Toronto View Post
Shemp! Guarding the button? Like that makes me feel comfortable?

We are doomed I tell you. DOOMED!


No worries. It’s the button for the gate on the goat pen.


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Old 28th September 2021, 01:01 PM   #55
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Originally Posted by Fast Eddie B View Post
There’s a wonderful short story by Isaac Asimov that weaves a similar tale:

https://www.physics.princeton.edu/ph115/LQ.pdf

Well worth the time if you haven’t read it - it’s only 9 pages long.
One of my two favorite Asimov stories!
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Old 28th September 2021, 01:08 PM   #56
Ziggurat
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Originally Posted by Gord_in_Toronto View Post
Shemp! Guarding the button? Like that makes me feel comfortable?

We are doomed I tell you. DOOMED!

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Old 28th September 2021, 02:18 PM   #57
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Originally Posted by Ziggurat View Post
That does NOT make me feel any more comfortable.

https://vimeo.com/126720159
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