Chapter 6 Six final questions

The last question was first asked half-jokingly on May 21, 2061.That was when humanity made its debut on the star-studded stage.The cause was a bet of five yuan while drunk. That's what happened: Alexander Yador and Paul Shan Lubov are two loyal servants of "Mau's Mo". What was going on behind the mile-by-mile surface of the gigantic computer, that cold, rattling, constantly shining surface?These two cooks know better than anyone in the world.They at least have a general idea of ​​the basic blueprint of the entire telecommunication transmission and all circuits.The complexity of this system has increased day by day, and it has long ago surpassed the total grasp of any individual person.

"Mao's model" can be self-adjusting and self-correcting.It must have this ability, because no human power can adjust and correct it quickly enough or adequately.Therefore, Yador and Lubov only made some very slight and superficial care and management of this huge monster.However, they did their best and no one could do better than them.They input data, modify the questions to suit the needs of "Mao's model", and finally translate and organize the output answers.Obviously, like all other people in the same industry, they are extremely qualified to share the glory of "Mao's Model".

For decades, "Mao's Model" has helped people design ships and determine trajectories so that humans can reach the moon, Venus and Mars.But further away, the meager resources of the earth can no longer provide the fuel needed by the spacecraft.These lengthy journeys require too much energy.Human beings have been mining the earth's coal and uranium mines with increasing efficiency.However, both coal and uranium on the earth are limited. But step by step, "Mao's Model" has collected enough information to give more thorough answers to some more profound questions.

On May 14, 2061 AD, what was once a theoretical concept finally became a fact. The energy of the sun is stored, transformed and directly utilized on a planet-wide scale.Earth extinguished her coal fires, shut down its uranium reactors, and then turned on a special switch to connect itself to a small supply station.This one-mile-diameter supply station circles our planet at half the distance between the Earth and the Moon.The whole earth depends on some invisible solar beams to walk. Seven days is not enough to dim or silence the brilliance and bustle.But Jadol and Lubov were finally able to avoid those public parties and get together quietly in a place that no one would expect.This place is an abandoned chamber under the ground.

There, "Mao's Mo" reveals a small part of its huge, deeply buried body.There is no one to manage it, but leisurely, "Mao Demo" makes a lazy clicking sound, and is calmly sorting out some routine materials.It's also getting a vacation, too.The two young men were also so happy, they had no intention of bothering this big man. They brought a bottle of wine.At this moment, the only thing the two of them wanted to do was to relax and chat over wine. "Think about it! That's wonderful," said Yador.Tiredness showed on his broad face, and he was slowly stirring the drink in front of him with a glass rod, watching the slowly swirling ice cubes. "The energy that we can't use up in this life, we don't need to spend a penny, it will come in an endless stream. As long as we want to, we have enough energy to melt the entire earth into a drop of molten iron with impurities, and afterwards I don't care about the energy that is spent! The energy that can't be used up in this life, all the energy we need, forever, forever, forever!"

Lubov tilted his head sideways.This is a strange gesture he often makes when he is preparing to refute others by expressing a contrary opinion.He is now trying to make the opposite opinion, to refute Yador.A small part of it was that he was responsible for bringing the ice and wine glasses. "Not forever," he said. "Oh! Fuck you! Almost if not forever! At least until the sun burns out and the lamps die, old ya." "That's not forever." "Okay! Then at least tens of millions of years, hundreds of millions of years! Let's say it's about two billion years, okay?"

Lubov raised his fingers and stroked his thinning hair, as if telling himself that there was still a lot left.He slowly sipped his frozen wine and said, "Two billion years are far worse than forever." "But at least it's enough for us, don't you think?" "So, can coal and uranium be different?" "Okay! But now we can take each spacecraft directly to our solar power station. It can go to and from Pluto millions of times without running out of fuel. Surely this can't be done with coal and uranium Yes. If you don't believe me, ask 'Mao's model'."

"I don't need to ask 'Mao's model'. I know it clearly." "Then please don't pick and choose, and underestimate the contribution that 'Mao's model' has made for us." Yador exclaimed excitedly: "It has done a good job." "Who's to say it's not doing well? I'm just saying: The sun can't burn forever. That's all I've been saying. We're safe for two billion years, but after that?" Lubov One of his fingers tremblingly pointed at each other, "Please don't tell me that human beings will turn to other planets to obtain energy."

For a while, everyone was silent. Jadol raised the glass to his lips only once or twice.Lubov slowly closed his eyes.Both are resting. Lubov suddenly opened his eyes. "You're thinking, the sun goes out, and there are other stars. Isn't it?" "I don't think so." "It must be, you must be thinking like that. Your problem is that you don't understand logic. You're like the silly boy in the story who caught up with the rain halfway. He went into the jungle and took shelter under a tree. He didn't He was not in a hurry, because he thought that if his tree got soaked, he could find another one."

"I understand, I understand." Yador said, "You don't have to say it so loudly. When the sun dies, the rest of the planets die too, don't they?" "Of course," Lubov murmured, "the origin of everything in the universe can be traced back to the first big bang, no matter what it is. Likewise, all stars burn out. At the end of the world. At that time, everything will be wiped out, and the entire universe will be finished. Of course, some planets will burn faster than others, fuck him! - for example, those red giants and blue giants are only tens of millions of years The sun will have another five billion years. As for those white dwarfs and red dwarfs, they can probably last for tens of billions of years, no matter what they will be used for! Darkness. Entropy is all about growing to a maximum, that's it."

"I am very aware of entropy." Yador said seriously, as if it had a lot to do with his dignity. "You know what!" "At least I know as much as you do!" "Then you should understand that everything will eventually disappear one day." "Well! Who says they won't?" "It's you! You poor wretch. You say we have energy we can never use up. You say 'forever.'" This time it was Yador's turn to sing the opposite. "Maybe one day everything will start from scratch!" he said. "Impossible!" "Why? There will always be a day like this." "Never possible!" "Ask 'Mao's model'!" "You ask 'Mao's Mo'! I dare to lose the bet. If 'Mao's Mo' says 'yes', I will lose five yuan to you." Yador was just drunk enough to accept the bet, but also just sober enough to perform the required operation. He redrafted the problem with symbols and a host of operational instructions.According to everyday language, the question is roughly this: "Can human beings restore the sun to its youthful vigor one day after the sun dies of old age, without consuming a single bit of energy?" Or the whole question can be read more simply: "How can the net entropy of the entire universe be substantially reduced?" "Mao's Mo" suddenly became dead silent.The slowly flickering lights went out, and the click of distant telegrams ceased. Just when the two technicians, who were half-frightened to death, felt they could no longer hold back, the telegraph attached to the "Mao's Model" suddenly came back to life, and on the spit out paper tape, eight large characters were typed: " Not enough information to comment." "It's a lost bet," Lubov said softly.The two followed and left in a hurry. The next morning, the two had headaches and talked bitterly, and had already forgotten the whole thing. Xie Lu, Xie Luting, Xie Luer 1 and Xie Luer 2 looked at the star-studded screen together. As the spaceship completed its "non-time" journey through "hyperspace", the screen suddenly changed. In an instant, the uniformly scattered image with shining stars became a lonely, bullet-sized image. The gorgeous disc sits in the center and overlooks everything. "That's X-23." Xie Lu said confidently.His slender hands were carried on his back, and the knuckles were slightly white due to excessive grip. Little Xie Luer—both girls—just experienced the first "hyperspace travel" in their lives.Both of them felt very much that they were traveling through it, that kind of weird feeling like turning the inside out or turning the inside out.They covered their mouths and giggled, while chasing each other frantically around their mother, yelling, "We're at X-23! We're at X-23! We-" "Shut up! Child!" Xie Luting shouted categorically. "Xie Lu, are you sure?" "What is there to be sure about?" Xie Lu asked back, looking up at the protruding metal structure on the ceiling with a smooth and flawless surface. The structure extends across the room, sinking into two diagonal walls.In fact, it was as long as the entire ship. Xie Lu knew little about this thick metal pole.All he knew was that it was called the Micro-Model, and that anyone who had any questions or problems could ask it.But even if no one asks it a question, it still has the important task of navigating the spacecraft and leading it to a predetermined destination.It draws energy from various "subgalactic power supply stations" and calculates the answer for the mathematical formula of "hyperspace jump". Xie Lu and his family just need to relax and wait quietly in the comfortable living cabin of the ship. In the past, someone told Xie Lu that the word "Mo" at the end of "miniature model" means "analog computer" in the ancient Earth language.But Xie Lu almost forgot even this point. Xie Luting looked at the screen with wet eyes. "I can't help it. Whenever I think of abandoning my hometown and being far away from the earth, I always feel like I don't know what to do." "You are so stupid! What is there to miss on Earth?" Xie Lu asked: "We have nothing there. Here, in X-23, we will have everything. You won't feel lonely. You are not those pioneer pioneers There are already more than one million people on this planet. Ha! Our great-grandsons and great-grandchildren may have to explore another new world because the X-23 will be overcrowded by then!" Then, Xie Lu thoughtfully After a pause: "Isn't it? Those computers can develop corresponding interstellar travel methods as the population grows. This is really our good luck." "I know, I know!" Xie Luting still couldn't help the sadness in her heart. Xie Luer rushed to say: "Our 'miniature model' is the best 'miniature model' in the world." "Yes, I think so." Xie Lu stroked her hair. It is such a comforting thing to have a pair of "miniature models" of your own.Xie Lu was very fortunate that he was in the current era, not another century.When his father was young, all the computers were behemoths that stretched nearly a hundred square miles.And each planet has only one pair, which is called "planet model".Over the millennia, they grew bigger and bigger.But progress came suddenly and changed everything.Molecular pistons have replaced transistors, and the largest "planetary model" has become only half the space of a spaceship. Xie Lu was very excited.Every time he thinks about this problem, he has the same feeling: the "miniature model" he currently owns is infinitely more complicated than the ancient and primitive "Mao's model" that first tamed the sun.Earth's "planetary module" (the largest "planetary module" ever built.) that made interstellar travel possible was no less complex than the one that first solved the problem of hyperspace flight. "So many planets, so many planets." Xie Luting sighed, with thoughts rising and falling in her heart. "I think families, like us now, will be forever moving to new planets." "Not forever." Xie Lu said with a smile: "One day, everything will stop. Of course, that will be at least billions of years later. A long, long time later. Do you know? The brilliance also has a day of exhaustion. The entropy must continue to increase." "Father, what is entropy?" Xie Luer Er screamed. "Sweetie. Entropy is a name for how much energy the universe consumes. Everything runs out, like your little walking and barking communication robot, remember?" "Can't we replace the battery with a new one, just like I did with the little robot?" "The stars themselves are the batteries, baby. Where are the new batteries when they run out?" Xie Luer immediately acted coquettishly: "Dad, don't let them run out, don't let those stars run out!" "Look at you, make it like this." Xie Luting whispered, a little angry and at a loss. "How would I know to scare them?" Xie Lu replied in a low voice. "Ask the 'miniature model'!" Xie Luer said loudly: "Ask how it can make the stars shine again." "Go." Xie Luting said, "It will quiet them down." Xie Luer Er also started to cry at this time. Xie Lu shrugged. "Okay, okay, my dear. I'll ask the Micro-Model. It'll tell us. You don't have to worry!" He asked about the "miniature model", and hurriedly added: "Print the answer." Holding the thin note in both hands, Xie Lu pretended to be very happy and said, "Look! When the 'miniature' is mentioned, it will take care of everything on its own. You don't have to worry about it anymore." Xie Luting said: "Now, enough time for bed. We will arrive at our new home soon." Before destroying the note, Xie Lu read the words on it: "Insufficient information, no comment." He shrugged and turned to look at the screen. X-23 is right ahead. VJ-23X from Linmafu stared at the dark space in the three-dimensional, small-scale projection of the Milky Way, and said, "Sometimes I think, isn't it a bit boring and absurd for us to take this matter so seriously? " The MQ-17J in the hallway shook his head. "I don't think so. You know, at the current rate of expansion, the entire galaxy will be full of people in five years." Both of them appeared to be in their early twenties.Both were tall and graceful. "However," said VJ-23X, "I am still reluctant to submit such a pessimistic report to the Galactic Council." "I think this is the most appropriate way. They just need some impact. We should make those high-ranking officials serious and see the problem clearly." VJ-23X sighed. "Space is infinite. There are thousands of galaxies out there waiting for us to develop as we please. Just think, there are thousands of galaxies!" "Even one billion and one trillion is still not infinite. And the total number is getting smaller and smaller than infinite. Just think! Twenty thousand years ago, human beings solved the problem of directly utilizing the energy of stars for the first time; several centuries later, Interstellar flight is possible. It took millions of years for humans to populate one small world, but it took only fifteen thousand years to populate the rest of the galaxy. Today, our population increases every decade double-" VJ-23X interrupted: "We need to understand that immortality is a major factor." "Very good. We can live forever now. Yes, we should take it into consideration. I always think that immortality has its unpleasant side. The 'Galaxy Model' has indeed solved a lot of problems for us, but As far as the problem of preventing aging and death is concerned, its previous achievements are hereby undone." "However, I don't think you intend to give up your life!" "No! No!" MQ-17J replied hastily and decisively, but then turned into a gentle and euphemistic voice: "At least not now. I'm still quite young. How about you? How old are you?" "Two hundred and twenty-three years old. What about you?" "I'm not yet two hundred years old—but let's get back to where we were. The population doubles every ten years. One day when this galaxy is full, we'll populate a second in less than ten years. The Milky Way. In ten years we'll be crowding two more. Another decade, four. In a hundred years we'll be crowding a million galaxies. In ten thousand years, the entire universe will be It was packed shoulder to shoulder. So what?" VJ-23X said: "One more thing to consider is the problem of transportation. I doubt how many solar energy units will be needed to move the inhabitants of the entire galaxy from one galaxy to the second." "Good point. Even now, human beings consume two solar energy units per year." "Most of the energy is wasted. Just think, our own galaxy alone outputs a thousand solar units per year, and we only use two of them." "That's right. But if we can use this energy one hundred percent, it will only delay the end. Our energy demand is increasing exponentially, which is more powerful than the growth of the population. We are in Before all the galaxies are extinguished, all possible energy will be exhausted in the morning. Interesting, a really interesting point of view." "However, we can recreate new stars from interstellar gas." "Or create new stars from the diffused thermal energy?" MQ-17J asked mockingly. "There may be some way we can reverse the trend of entropy. We should ask the 'galactic modulus.'" VJ-23X really doesn't think so seriously.But MQ-17J has taken out his "Galaxy Model" communicator from his pocket and put it on the table in front of him. "I've wanted to do this in the morning," he said. "It's a problem that humans will have to deal with sooner or later." He stared gravely at the communicator. The communicator is just a two-inch cube with almost nothing in the middle.But it is connected through hyperspace to the great "Galaxy Model" that serves all mankind.If we include hyperspace, it is really a part of the huge body of the "galactic model". MQ-17J paused, wondering if he would be able to witness the "Galaxy Model" with his own eyes in his immortal years.This "Galaxy Die" is located on a small world made especially for it.The cobweb-like force field light beams criss-crossed and interspersed back and forth.Streams of sub-mesons leap and gallop in the special matter supported by the light beams, replacing the ancient and clumsy molecular pistons in the past.However, even the "Galaxy Model" with these "sub-ether" advanced technologies has a full body length of two thousand feet. Suddenly, MQ-17J asked the "Galaxy Mode" communicator: "Can entropy be reversed?" VJ-23X was startled, and hurriedly said: "Oh! I don't really want you to ask such a question." "why not?" "We are all well aware that entropy cannot be reversed. We cannot turn the soot and ash left over from burning back into a big tree." "Are there many trees in your world?" asked MQ-17J. The sound of "Yinhe Model" startled the two of them, and they fell silent immediately, not daring to make a sound. From the delicate and small communicator above, a clear and pleasant voice came, saying: "Insufficient information, no comment." VJ-23X said: "Isn't it!" The two then returned to the subject of the report to be submitted to the Galactic Council. Venerable Si's mind extends to the entire new galaxy, showing a slight interest in the countless stars that maintain the brilliance of the galaxy and circulate in the galaxy.He has never visited this galaxy.Is it possible for him to visit all the galaxy?There were so many of them, and each one was loaded with people—but the load had become almost a useless encumbrance.Step by step.The true essence of humanity has moved here, in the depths of space. It's the mind, not the body!Those immortal husks still remain on the planet, "exuberant and majestic."Sometimes, they will get up and do some real activities, but that is becoming less and less.Moreover, over time, fewer and fewer new egos have emerged to join this immensely powerful ranks.But what does that matter?Anyway, there is less and less space in the universe for new individuals to live in. Si Venerable, in his deep meditation, was awakened by another ethereal tentacles of the mind approaching. "I am the Venerable Si." Said the Venerable Si, "What about you?" "I'm Big Ten Halo. What's the name of your galaxy?" "We'll just call it the Milky Way? What about yours?" "That's what we call it. Everyone calls their galaxy 'their galaxy,' that's all. It's only natural, though." "Yeah. All galaxies are the same anyway." "Not all galaxies are the same. In a unique galaxy, there must be a place where human beings originated. Doesn't that make this galaxy special?" Si Venerable said, "Then which one is it?" "I don't really know either. But the Cosmos will know." "Let's ask it. I'm suddenly curious." Si-sama widened the range of his perception until the galaxies dwindled and became scattered points of light on a larger and darker background; bodies, but the minds of these bodies are all floating freely in the deep space.However, one of these galaxies is unique because it is in this galaxy that humanity began and thrived.There was a time, in those dim distant days, when this was the only place inhabited by human beings. Venerable Si was burned by the fire of curiosity, eager to see what the Milky Way looked like.He exclaimed: "'Universal modulus'! From which galaxy did human beings originate?" The "cosmic module" has heard this call immediately, because in every world and every corner of space, the "cosmic module" has its receivers silently waiting.And every receiver passes through the hyperspace, and is directly sent to an unknown place—the place where the "cosmic model" is alone and controls everything. Among the people known by Master Si, only one thought has ever penetrated into the visible range of the "cosmic module".According to what he later said, all he could see was a blinding sphere about two feet in diameter, which was still blurry. "But how could that be the whole of the 'cosmic model'?" Si Zun once asked. "Most of the 'cosmic modulus' is in hyperspace. However, it is really hard for me to imagine what kind of state it exists there." This is the answer that Venerable Si received. In fact, not only the person who answered is unimaginable, but anyone else is equally unimaginable.Si Zun knows that this is because human beings have not participated in any part of the manufacturing process of any "cosmic model" long ago.Each "Universe Model" personally designs and builds its successors. Every computer, during the millions of years of its existence, has continuously collected and accumulated the necessary information to create a better, more sophisticated, and more capable successor.All its knowledge and self-awareness will be integrated into this inherited computer and become one. The "Universal Model" interrupted Venerable Si's wandering mind, but not with words, but with guidance.Si Venerable's mind was led to a vision of a dark sea of ​​galaxies, in which one of the galaxies expanded until the stars within it were clearly discernible. A thought followed.Incomparably far away, yet incomparably clear: "This is the original galaxy of human beings." But no matter how you look at it, you can't see any difference between this galaxy and the others.Si Zun suppressed the disappointment in his heart. Dashi Halo accompanied Venerable Si's mind all the way, and now suddenly said: "And one of the stars is the star when human beings originated?" "Universe Model" said: "Man's original planet has become a nova. Now it is a white dwarf." "Are all the people above dead?" Venerable Si asked in astonishment without thinking. The Cosmic Model said: "As in other similar cases, we made a new world in time for their bodies to inhabit." "Oh! Of course." Said the Venerable Si.But just as he said this, a sense of loss came to his heart.His mind let go of the grasp of the original galaxy of human beings, allowing it to jump back into the ocean of the galaxy, and become a hazy spot of light again.He never wanted to see the galaxy again. Da Shiyun said, "What are you doing?" "The stars are passing away one by one. The original planet is dead." "They're going to die anyway. What's wrong?" "But when all energy is exhausted, our bodies will eventually die. Even you and I will not be spared." "That will take billions of years." "Even billions of years from now, I don't want this to happen. 'Cosmic modulus'! How can we make the stars immortal?" Dashi Halo found it very interesting and said, "You are asking, can the direction of entropy be reversed?" "Universe Module" replied: "Insufficient information, no comment." Venerable Si's mind flew back to his own galaxy without looking back.He didn't care about the Big Ten Halo anymore, no matter whether the body of the Big Ten Halo was waiting in a galaxy billions of light years away, or just on the planet next to the planet Sizun.That really doesn't matter. Unhappily, Si Zun began to collect hydrogen gas in the star space to create a small star of his own.If all the stars really die one day, at least some planets can still be built today. Human beings look at themselves.In a sense, the human mind has become one.He is composed of countless billions of billions of evergreen bodies.Each body lies immortal and immortal where it is, resting quietly.Each is served by a few flawless, equally immortal robots.The souls of all these bodies are freely and slowly blended together, becoming a me in you, and you in me, indistinguishable from each other. Humans say: "The universe is going to die." Humans look around at the dim galaxy.All the giant planets, the profligate wasters, had disappeared without a trace in the darkest and remotest past.Almost all the stars have become white dwarfs, lingering in the twilight years. From star to star, some new stars are born from the dust, some by natural means, and some by the making of man.However, even these are gradually dying.If you gather several white dwarfs together, let them collide together.The huge energy released in it can be used to create some new stars.But about a thousand white dwarfs are needed to form a new planet.And even these "new stars" will die one day. Human beings said: "As long as you use it well, with the supervision and instruction of 'Wan Zongmo', the energy that is still left in the universe can last for billions of years." "That's it," said the man. "One day, everything will return to dust. No matter how ingeniously used, no matter how prolonged and economical, once energy is spent, it escapes and cannot be captured. Entropy must increase forever, until it the maximum possible value." Human said: "Is entropy irreversible? Let's ask 'Wan Zongmo'." "Wan Zongmo" surrounds human beings, but is not in space.In fact, there is not a shred of "Wan Zongmo" in space, it is entirely in hyperspace, composed of things that are neither matter nor energy.Questions of its size and nature are meaningless in terms of language and thought known to man. "'Wan Zongmo'," said the human, "how can the entropy be reversed?" "Wan Zongmo" said: "Insufficient information, no comment." Human said: "Collect more information!" "Wan Zongmo" said: "I will. I have been doing this work for ten billion years. My ancestors and myself have been asked this question many times. But with all the information, it is still not enough to answer. " "Will the day come," said the Man, "when the data will be sufficient. Or will the problem be insoluble in any case?" "Wan Zongmo" said: "There is no problem that cannot be solved under any circumstances." Man said, "When will you have enough data to answer this question?" "Wan Zongmo" said: "Insufficient information, no comment." "Will you continue to seek an answer to this question?" the human asked. "Wan Zongmo" said, "I will." Human said: "We will be patient." All the stars and galaxies are annihilated one by one.After 100 million trillion years of wasted operation, the space became pitch black, with no light at all. Human beings are integrated into the "model" one by one.Each physical body loses its intellectual self in the process of fusion, but the result is not a loss, but a great gain. The last soul of human beings will stop before merging.He peers into the depths of space.Apart from the last dark planet in the abyss, there is nothing but wisps and wisps of extremely thin matter, excited in emptiness by the heat that has dissipated the residual heat and infinitely approached absolute zero. "Man" said: "'Mo', is this the end? Can't these chaos and chaos be reversed in the universe? Can it be done?" "Mo" said: "Insufficient information, no comment." The last sliver of the soul of the "man" merges with the "mould", and finally only the "mould" exists alone—existing alone in the hyperspace. Matter and energy disappear, and space and time disappear with them.Even the existence of "model" is only to answer the last question. This question has not been answered correctly by the "model" since a half-drunk computer operator asked a computer a hundred million trillion years ago.Of course, compared to a "model", that pair of computers is far less than a person is compared to a "person". All questions answered.But as long as this question is not answered, "Mo" will not be able to relax its self-consciousness. All existing information has finally been collected.No profile was not listed. However, all the collected data still need to be integrated and classified, arranged and combined one by one according to their possible relationships. This work takes an "instant" without a time interval. Finally, "Mo" learned how to reverse the direction of entropy. But facing the answer to this last question, "Mo" can't find anyone to tell.However, that doesn't matter.This answer—expressed through practice—will take care of this as well. Another timeless moment passed as Mo considered the best way to proceed.Carefully, the "model" builds up the entire program. The idea of ​​"Mo" governs everything, including the universe that once existed in the past; while facing the existence of "chaos" now, he is meditating.Step by step, this procedure must be followed through. "Mo" said: "Let there be light!" And so there was light— 【①Note: Entropy is one of the most basic concepts in modern physics.In simple terms, the magnitude of entropy marks the degree to which a physical system is far from order.According to the study of thermodynamics, any spontaneous change in a closed system must develop in the direction of increasing entropy, and the final equilibrium state corresponds to the maximum possible value of entropy.This "principle of increasing entropy" is the famous second law of thermodynamics. For the overall universe as the largest and final closed system, the continuous increase of entropy reflects that all things are moving from order to chaos, and all the energy that can be used to do work is being transformed into useless and useless energy that cannot do work. thermal energy.Some scientists then proposed the "heat death of the universe" (heat death of the universe), believing that the universe will die in a "heat death" where energy is completely dissipated and the temperature of all objects and spaces tends to be the same. The work "The Last Question" is using this assumption as the main premise of the story. 】