Name: We Found a Loophole to Survive the End of the Universe
Uploaded: 2025-11-17T17:02:50.000Z
Duration: 12 min 42 s
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Can we survive the heat death of the universe?

One day the last star will die, galaxies will dissolve and black holes will evaporate.

The cosmos will become a forever expanding empty void where nothing happens forever.

A place without life, purpose or meaning.

But there might be a loophole in the laws of physics for a future civilization to to survive the death of everything and go on having fun and Internet arguments for googols of years, maybe even forever.

To explain how this works, we need to go through a few steps.

So strap in if you want consciousness to live forever.

Let's travel 100 trillion years into the future when the last stars are about to die and the cosmos starts turning dark forever.

Here in this dying universe, we find the Noxons, the last civilization still alive.

They've solved physics and can do things we can only dream of.

Still, the same rules of reality apply to them as to us.

The Noxons like being alive and don't want to vanish with the last stars.

So they're enacting the plan to keep consciousness around forever.

If you want to keep a civilization running, you need a lot of it, but

In cosmic terms, with five hours of the full energy emitted by the sun, we could power present day humanity for about 10 billion years.

So the Noxons harvest the last stars and build a gigantic complex of batteries around their home star.

In principle, this energy could keep them alive for a few hundred trillion years.

The Noxons need to change the nature of life itself.

Being alive means doing things, eating, playing video games, and very importantly, thinking.

There's an idea from a famous paper we'll mercilessly simplify and call Dyson's Cold Thoughts In a nutshell.

The idea is that the lower your temperature, the less energy it takes to do something.

Your brain runs at a temperature of 310 degrees above absolute zero.

Zero is the temperature where nothing can happen any.

At 310 degrees, your brain needs 20 joules of energy to think.

A simple thought that takes one second to think, like I should wear a funny hat.

If your brain worked at colder temperatures, say 155kelvin instead of 310, a few things would change.

First of all, you'd think at half the speed and the same thought would now take Two seconds.

But in return, the energy you'd need to think.

The thought now halves from 20 joules to only 10.

If Dyson's cold thoughts are correct, then the colder you go, the less energy you need to think a thought at 1/10 your current temperature.

The same thought would take 10 seconds, but only require two joules.

And this has wild implications because it means that we actually might be able to play this game forever.

In reality, cooling down a living organism isn't easy.

If we put you in a fridge, you'll die from hypothermia.

The reality is that this plan will be impossible to do with flesh and blood.

So the Noxons have to take a huge step before we cool anything down.

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Because even with more efficient brains, we're still prone to the same biases we face today.

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They have to leave biology behind and transfer their minds into some kind of artificial brain.

Or even better, become completely virtual minds and build a digital world as good or better than the real one.

So to be fair, we don't know how to build such brains or computers.

But remember, we are 100 trillion years in the future.

The Noxons are desperate and the laws of physics should allow this.

So now we have a pretty big battery with a huge but finite amount of energy and a lot of brains.

Ok, this is great and all, but how do you stay around with limited energy forever?

Each time the Noxons get colder, they need less Energy to stay alive.

Sure they'll be slower, but this isn't relevant to them.

So from the Noxons perspective, as long as they can keep getting colder fast enough, their batteries energy is growing proportionally and could keep them alive forever.

As the last star in the universe goes out and the universe turns dark forever, the Noxons activate their batteries and start cooling down their brains.

Well, you unplug it so it can radiate away its heat.

So the Noxons switch off their brains and start to hibernate.

They enter a state with no activity, thoughts or even dreams, and

let their bodies radiate heat away to cool down a bit.

When they activate again after some time, they're now colder than before.

They think slower and each thought uses up less energy from their battery.

They enter into a new cycle of cosmic days and cosmic nights.

During the days they're alive and awake, doing all the stuff they want to do, hanging out with friends, thinking about things, eating virtual cheeseburgers, simulating universes.

Whatever type 3 civilizations think fun is in the future.

And during the night they're switched off, lost in dreamless non existence, not even noticing anything isn't happening.

While cooling down their brains even more.

At the beginning, the nights will be very short and the days extremely long.

A day can last a million years, while night is only a few hours.

But warm things shed heat much faster than cold ones.

Cooling from 300 to 299 degrees takes much less time than going from 100 to 99.

So as the Noxon brains become colder, the nights will have to grow longer and longer.

How long could the Noxons actually do this?

The reason Dyson's cold thoughts are so incredibly powerful is how incredibly they scale as eons pass in the dying universe, the Noxons keep cooling down and waking up.

After a hundred trillion years of this cycle, their temperature has only dropped 230 degrees above absolute zero.

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We Found a Loophole to Survive the End of the Universe

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