u/Tessellator-1

早々のフラーレン

If you make the question simpler, is it possible that it is a problem that cannot be solved in theory?

⚠︎By the way, this sentence was translated from Japanese to English. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated. Thank you!

⚠︎this sentence was translated from Japanese to English by AI. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated. Thank you!

I haven't read either of these books yet, so I wanted to ask those who have, or anyone who loves exploring extraterrestrial intelligence theories.

In both stories, the galaxy seems to be full of intelligent civilizations, and interstellar travel is technically possible—at least within their universes. So, why hasn't anyone fully colonized the galaxy yet? Is there an explanation for why no one colonized Earth over the billions of years to prevent a potential threat like humanity from emerging in the first place?

そばにいたいよ
僕のために出来ることが　君にあるなら

⚠️this sentence was translated from Japanese to English by AI. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated.

I want to know if it's theoretically possible because I'm creating a creation with a sci-fi element.
It assumes the setting of a nuclear test in space like Starfish prime.

If it is impossible in principle, is it possible for a sufficiently developed scientific civilization to communicate with only electromagnetic waves over a distance of billions of light years in the first place?

⚠️this sentence was translated from Japanese to English by AI. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated.

I want to know if it's theoretically possible because I'm creating a creation with a sci-fi element.
It assumes the setting of a nuclear test in space like Starfish prime.

If it is impossible in principle, is it possible for a sufficiently developed scientific civilization to communicate with only electromagnetic waves over a distance of billions of light years in the first place?

⚠️this sentence was translated from Japanese to English by AI. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated.

I want to know if it's theoretically possible because I'm creating a creation with a sci-fi element.
It assumes the setting of a nuclear test in space like Starfish prime.

If it is impossible in principle, is it possible for a sufficiently developed scientific civilization to communicate with only electromagnetic waves over a distance of billions of light years in the first place?

いつでも外しているよ　そっぽに矢道狂わせ
星的の横　手前の矢道　こんなとこに射るはずもないのに

気い張った名医畑芽育、歯貯め遺棄。
這った為息はため息、傍迷惑。
旗目良い旗はためいて、旗名は「溜め井」。
傍目「畑め…！」言い張った名ハッター姪。

⚠️The following sentence was translated from Japanese to English by AI. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated.

I've heard that falling on the horizon of events is subjectively a normal speed, but objectively it cannot be reached within a finite time,

Then if I go to Gargantua a few trillion years later, can I still see Cooper falling from the outside? Or is there a mechanism that allows him to cross the horizon of events within a finite time?
Did the future man assist Cooper even outside the horizon of the event?

this sentence was translated from Japanese to English by Chat GPT. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated. Thank you!

A question for viewers of Isaac Arthur’s YouTube channel!

I’m currently working on a fictional setting in which, as of the early 21st century, scientists have already determined that the proton’s half-life is about 10^36 years. I plan to depict human civilization 2 × 10^36 years in the future.
By that point, humanity occupies part of the Local Group, which has become isolated from the rest of the universe due to cosmic expansion. Several intelligent civilizations have survived there in a kind of long-term stalemate, while humanity spends most of its time inside virtual reality.
However, proton decay is gradually reducing the amount of matter available to them, and with no solution in sight, their civilization is facing an existential crisis.
What I’m struggling with is figuring out how this civilization managed to survive from the present day all the way to that era in the first place.
Some possibilities I’ve been considering are:

・controlled stellar fusion for energy
・extracting energy from the rotation of black holes
・minimizing energy consumption through reversible computing

But I’m not sure which of these would be the most plausible approach, or whether there are better possibilities I’ve overlooked.
I’m also having trouble figuring out what the civilization would actually be physically made of by that point. After such an unimaginably long period of cosmic evolution, what kinds of matter or structures could realistically still exist and serve as the basis of an advanced civilization?

I’ve been looking for material that could help me build a scientifically plausible setting for this era. Isaac Arthur’s channel seems to discuss extremely far-future civilizations in quite a lot of detail, but I’m not sure how accurately YouTube’s automatic translations and summaries reflect the actual content.
So I’d really appreciate hearing from people who are familiar with Isaac Arthur’s work: What does he actually suggest about civilizations surviving into the proton-decay era, and what technologies or forms of matter might they rely on?
Any interpretations, corrections, or suggestions for building this kind of setting would be greatly appreciated!

I’ve heard that if proton decay does occur, the estimated half-life of the proton is somewhere around 10^34 to 10^36 years. But proton decay is still only a hypothesis, right? So I’d like to ask people who know more about physics and cosmology about two things:

1:
If proton decay never happens, what would matter and artificial structures look like 10^36 years from now?

2:
Even if proton decay does occur, would the matter that has not yet decayed by that point be in essentially the same state as described in the answer to question 1?

The reason I’m asking is that I’ve recently been working on a fictional setting involving a civilization that has managed to survive far beyond the proton half-life thanks to energy-efficient intelligence based on reversible computing. I’m wondering whether such a civilization could still build things like machines and other structures in that incredibly distant era.

Whenever I ask questions along these lines, though, people seem to misunderstand me as asking what happens to matter after proton decay. Also, most of the “timeline of the far future” charts I’ve found online focus almost entirely on the evolution and eventual disappearance of stars.
So I decided to phrase the question differently this time.
I may make another post soon with a more direct and specific question about the same topic.

※ this sentence was translated from Japanese to English by Chat GPT. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated.

If proton decay occurs, the predicted half-life of the proton is somewhere between 10^34 and 10^36 years. This made me wonder: what will actually happen to the things that exist in the universe between now and that unimaginably distant era?
I often see timelines describing the future evolution of stars, but I’d like to know what will happen, scientifically, to the following six things by around 10^36 years from now.

1: 1 kg iron sphere
(I’ve heard that iron is one of the most stable elements.)
2: stone monument
(Would inscriptions remain readable for an extremely long time, or would the writing eventually disappear?)
3: can of food
(What would happen to food sealed inside a can over such an enormous span of time?)
4: manufactured industrial product
(Any particular example of an interesting industrial product would be fine.)
5: planet
(What would happen to a planet if it somehow avoided being swallowed by its star?)
6: intelligent civilization
(Could an intelligent civilization that made extensive use of reversible computing potentially survive for an extremely long time in a simulated or virtual environment?)

For #1–4, please assume that the objects are floating in a vacuum. If they would eventually be destroyed or worn away by interactions with the interstellar medium, I’d also be interested to know what would happen if we ignore the interstellar medium.
I’d also love to hear about anything else you think would be particularly noteworthy or interesting. Thank you!

First of all, I would like to say that I have no knowledge about computer science.

I recently heard about something called reversible computing. As I understand it, in ordinary computers, erasing information about the intermediate steps of a computation causes energy to be released as heat. But in reversible computing, the information from all the intermediate steps is preserved, so apparently, if we could build a computer capable of doing this, it could theoretically perform computations with essentially no energy consumption.
This made me wonder about something, and I’d love to hear from anyone knowledgeable about physics or computational theory:
If you never erase the information generated during a computation, wouldn’t the amount of storage required keep increasing as the computer performs more and more calculations?
I previously came across a science-related page online that said that an intelligent civilization that has mastered reversible computing wouldn’t need “Dyson’s eternal intelligence” to survive the heat death of the universe.
But wouldn’t such a civilization still need an absolutely enormous amount of storage to preserve all the information generated during its computations?
Or is there some way to preserve the information from the computational process without actually requiring additional physical storage?
I’m especially curious about how this works in the context of extremely long-term civilizations trying to survive the heat death of the universe.

By the way, this sentence was translated from Japanese to English by Chat GPT. Feel free to answer in English. However, I only understand Japanese, so I would really appreciate clear and simple English that is less likely to be mistranslated. Thank you!