Cixin Liu Death's End Quotes

Weakness and ignorance are not barriers to survival, but arrogance is.

Time is the cruelest force of all.

If we lose our human nature, we lose much, but if we lose our bestial nature, we lose everything.

Death is the only lighthouse that is always lit. No matter where you sail, ultimately, you must turn toward it. Everything fades in the world, but Death endures.

The universe is grand, but life is grander. We’re certain to meet again.

The ultimate fate of all intelligent beings has always been to become as grand as their thoughts.

And now we know that this is the journey that must be made by every civilization: awakening inside a cramped cradle, toddling out of it, taking flight, flying faster and farther, and, finally, merging with the fate of the universe as one. The ultimate fate of all intelligent beings has always been to become as grand as their thoughts.

I need a dual-vector foil for cleansing.

Mere existence is already the result of incredible luck. Such was the case on Earth in the past, and such has always been the case in this cruel universe. But at some point, humanity began to develop the illusion that they’re entitled to life, that life can be taken for granted.

In the eternal night of the Orion Arm of the Milky Way Galaxy, two civilization had swept through like two shooting stars, and the universe had remembered their light.

Life shouldn’t be a lifetime of waiting.

The fish responsible for drying the sea are not here.

We'll send only a brain," he said.

He lacked the ability to thrive in society, but also the resources to ignore it. All he could do was hang on to the edge, suffering.

Hide yourself well; cleanse well.

The child that was human civilization had opened the door to her home and glanced outside. The endless night terrified her so much that she shuddered against the expansive and profound darkness, and shut the door firmly.

On the day of the universe's Last Judgment, two humans and a robot belonging to the Earth and Trisolaran civilizations embraced each other in ecstasy.

Because the universe is not a fairy tale.

I don’t have much to say except a warning. Life reached an evolutionary milestone when it climbed onto land from the ocean, but those first fish that climbed onto land ceased to be fish. Similarly, when humans truly enter space and are freed from the Earth, they cease to be human. So, to all of you I say this: When you think about heading into outer space without looking back, please reconsider. The cost you must pay is far greater than you could imagine. *

The whole universe is in darkness, but we remain lit. We're a tiny bird tied to a branch in the dark forest, with a spotlight trained on on us.

The universal laws of physics are the most terrifying weapons, and also the most effective defenses.

Even Coca-Cola probably tasted medicinal the first time you tried it. Anything addictive is like that.

That’s right. Five minutes into the all-hands meeting, the fundamental values of this totalitarian society had received the support of the vast majority of the crew. So, let me tell you, when humans are lost in space, it takes only five minutes to reach totalitarianism.

The experience of high-dimensional spatial sense was a spiritual baptism. In one moment, concepts like freedom, openness, profundity, and infinity all gained brand-new meanings.

The universe is but a corpse puffing up.

Cheng Xin now recalled the strange feeling she had experienced each time she had looked at Van Gogh’s painting. Everything else in the painting—the trees that seemed to be on fire, and the village and mountains at night—showed perspective and depth, but the starry sky above had no three-dimensionality at all, like a painting hanging in space. Because the starry night was two-dimensional. How could Van Gogh have painted such a thing in 1889? Did he, having suffered a second breakdown, truly leap across five centuries

Fundamentally, Tianming was not suited to live in society, nor out of it. He lacked the ability to thrive in society, but also the resources to ignore it. All he could do was hang on to the edge, suffering. He had no idea where he was headed in life.

Child, the moon is very lovely tonight. I just saw a kangaroo. I guess the refugees hadn’t eaten them all.

We’re going to advance! Advance! We’ll stop at nothing to advance!

To love humanity, you must start by loving individual persons, by fulfilling your responsibility to those you love.

Earth was treated as a knowledge battery: After it was charged fully with Trisolaran knowledge, it would provide more power.

Outside the ship, the thin membrane of space-time rippled with the gravitational waves, like a placid lake surface disturbed by a night breeze. The judgment of death for both worlds spread across the cosmos at the speed of light.

Everything was deathly quiet. The eyes were the most terrifying: the eyes of dinosaurus; the eyes of trilobites and ants; the eyes of birds and butterflies; the eyes of bacteria... The humans alone possessed one hundred billion pairs of eyes, equal to the number of stars in the Milky Way, Among them were the eyes of ordinary men and women, and the eyes of Da Vinci, Shakespeare, and Einstein.

There is no appropriate expression in human language to express the moment at the start of time.

The false alarm was the result of the explosive amplifying effects of a hyper-information society when fed sensitive news.

The greatest mystery in the universe is right in front of us. The answers to all our cosmological questions may be found here. How can we leave?!

If so, I'll just hold the umbrella up for you forever.

I want to tell all those who believe in God that I am not the Chosen One. I also want to tell all the atheists that I am not a history-maker. I am but an ordinary person. Unfortunately, I have not been able to walk the ordinary person's path. My path is, in reality, the journey of a civilization.

A new technology can transform society, but when the technology is in its infancy, very few people can see its full potential. For

Life reached an evolutionary milestone when it climbed onto land from the ocean, but those first fish that climbed onto land ceased to be fish.

A bottomless abyss exists in every inch

No banquet was eternal. Everything had an end. Everything.

Because of the speed of light. The known universe is about sixteen billion light-years across, and it’s still expanding. But the speed of light is only three hundred thousand kilometers per second, a snail’s pace. This means that light can never go from one end of the universe to the other. Since nothing can move faster than the speed of light, it follows that no information and motive force can go from one end of the universe to the other. If the universe were a person, his neural signals couldn’t cover his entire body; his brain would not know of the existence of his limbs, and his limbs would not know of the existence of the brain. Isn’t that paraplegia? The image in my mind is even worse: The universe is but a corpse puffing up.” “Interesting, Dr. Guan, very interesting!” “Other than the speed of light, three hundred thousand kilometers per second, there’s another three-based symptom.” “What do you mean?” “The three dimensions. In string theory, excepting time, the universe has ten dimensions. But only three are accessible at the macroscopic scale, and those three form our world. All the others are folded up in the quantum realm.

They were the first to be painted into this grand painting of annihilation.

No banquet was eternal. Everything had an end. Everything.

A museum was built for visitors; a tombstone was built for the builders.

He came; he loved; he gave her a star; he left. He pressed 3.

The universe is big, but life is bigger!

But, in our age, conscience and duty are not ideals: an excess of either is seen as a mental illness called social-pressure personality disorder. You should seek treatment.” *

Carpe diem has always been the right path. Of course there’s not much diem now for carpe, but we need not look for trouble. Let’s go.

life was not so rare in the universe. In fact, the universe was downright crowded. How much has the universe been changed by life? A wave of terror threatened to overwhelm her. She knew that she could no longer save herself. She tried to stop thinking, to turn her mind into empty darkness, but a new question stubbornly refused to leave her alone: Is Nature really natural?   Crisis Era, Year 4

Some call them doomsday ships. These lightspeed ships have no destination at all. They turn their curvature engines to maximum and accelerate like crazy, infinitely approaching the speed of light. Their goal is to leap across time using relativity until they reach the heat death of the universe. By their calculations, ten years within their frame of reference would equal fifty billion years in ours. As a matter of fact, you don’t even need to plan for it. If some malfunction occurs after a ship has accelerated to lightspeed, preventing the ship from decelerating, then you’d also reach the end of the universe within your lifetime.

Lovely markings are carved into time As soft to the touch as the mud in shallow sea. She covers her body with time, And pulls me along to fly to the edge of existence. This is a spiritual flight: In our eyes, the stars appear as ghosts; In the eyes of the stars, we appear as ghosts

Killing one person was murder; killing a few or dozens was ore murder; so killing thousands or tens of thousands ought to be punished by putting the murderer to death a thousand times. What about more than that? a few hundred thousand? The death penalty, right? Yet, those of you who know some history are starting to hesitate. What if he killed millions? I can guarantee you such a person would not be considered a murderer. Indeed, such a person may not even be thought to have broken any law. If you don't believe me, just study history! Anyone who has killed millions is deemed a 'great' man, a hero. And if that person destroyed a whole world and killed every life on it--he would be hailed as a savior!

Of course,” said Guan Yifan. “The great universe isn’t going to fail to collapse because it misses five kilograms.” He had another thought that he did not voice: Perhaps the great universe really would fail to collapse because it lacked a single atom’s mass. The precision of Nature can sometimes exceed the imagination. For instance, life itself required the precise collaboration of various universal constants within a billion-billionth of a certain range.

I don’t have much to say except a warning. Life reached an evolutionary milestone when it climbed onto land from the ocean, but those first fish that climbed onto land ceased to be fish. Similarly, when humans truly enter space and are freed from the Earth, they cease to be human. So, to all of you I say this: When you think about heading into outer space without looking back, please reconsider. The cost you must pay is far greater than you could imagine.

Whatever people do, the gods remember.

A lovely dream had ended: Dark forest theory had received its final confirmation with the annihilation of Trisolaris.

when humans are lost in space, it takes only five minutes to reach totalitarianism.

And now, the Sun really was melting, its blood seeping into the deadly plane. This was the last sunset. In

Time really was the cruelest force of all. Something

Human civilization now possessed a mirror in the universe, through which humanity gained a new understanding of itself through a novel perspective.

Ignorance and weakness is not an impediment to survival. Arrogance is.

Food? Everyone, look around: You are surrounded by food, living food.

But, in our age, conscience and duty are not ideals: an excess of either is seen as a mental illness called social-pressure personality disorder. You should seek treatment.

In the eternal night of the Orion Arm of the Milky Way Galaxy, two civilizations had swept through like two shooting stars, and the universe had remembered their light.

Do you think life is nothing but a fragile, thin, soft shell clinging to the surface of this planet?” “Isn’t it?” “Only if you neglect the power of time. If a colony of ants continue to move clods the size of grains of rice, they could remove all of Mount Tai in a billion years. As long as you give it enough time, life is stronger than metal and stone, more powerful than typhoons and volcanoes.

Only the phosphorescence of the planet’s liquid helium and hydrogen, diffused through the thick atmosphere, formed patches of hazy light roving about like eyeballs behind the closed eyelids of a dreamer.

Equally important was the fact that the interpretation provided the model for how Tianming had hidden his message in the three stories. He employed two basic methods: dual-layer metaphors and two-dimensional metaphors. The dual-layer metaphors in the stories did not directly point to the real meaning, but to something far simpler. The tenor of this first metaphor became the vehicle for a second metaphor, which pointed to the real intelligence. In the current example, the princess’s boat, the He’ershingenmosiken soap, and the Glutton’s Sea formed a metaphor for a paper boat driven by soap. The paper boat, in turn, pointed to curvature propulsion. Previous attempts at decipherment had failed largely due to people’s habitual belief that the stories only involved a single layer of metaphors to hide the real message. The two-dimensional metaphors were a technique used to resolve the ambiguities introduced by literary devices employed in conveying strategic intelligence. After a dual-layer metaphor, a single-layer supporting metaphor was added to confirm the meaning of the dual-layer metaphor. In the current example, the curved snow-wave paper and the ironing required to flatten it served as a metaphor for curved space, confirming the interpretation of the soap-driven boat. If one viewed the stories as a two-dimensional plane, the dual-layer metaphor only provided one coordinate; the supporting single-layer metaphor provided a second coordinate that fixed the interpretation on the plane. Thus, this single-layer metaphor was also called the bearing coordinate. Viewed by itself, the bearing coordinate seemed meaningless, but once combined with the dual-layer metaphor, it resolved the inherent ambiguities in literary language. “A subtle and sophisticated system,” a PIA specialist said admiringly. All the committee members congratulated Cheng Xin and AA. AA, who had always been looked down on, saw her status greatly elevated among the committee members. Cheng

I know about your experience as the Swordholder. I want to let you know that you didn’t do anything wrong. Humanity chose you, which meant they chose to treat life and everything else with love, even if they had to pay a great price. You fulfilled the wish of the world, carried out their values, and executed their choice. You really didn’t do anything wrong.” “Thank you,” Cheng Xin said. “I don’t know what happened to you after that, but you still didn’t do anything wrong. Love isn’t wrong. A single individual cannot destroy a world. If that world was doomed, then it was the result of the efforts of everyone, including those living and those who had already died.

Of course, I’ve only brought up two examples. Other universal laws of physics have been used as weapons as well, though we don’t know all of them. It’s very possible that every law of physics has been weaponized. It’s possible that in some parts of the universe, even … Forget it, I don’t even believe that.” “What were you going to say?” “The foundation of mathematics.” Cheng Xin tried to imagine it, but it was simply impossible. “That’s … madness.” Then she asked, “Will the universe turn into a war ruin? Or, maybe it’s more accurate to ask: Will the laws of physics turn into war ruins?” “Maybe they already are.… The physicists and cosmologists of the new world are focused on trying to recover the original appearance of the universe before the wars more than ten billion years ago. They’ve already constructed a fairly clear theoretical model describing the pre-war universe. That was a really lovely time, when the universe itself was a Garden of Eden. Of course, the beauty could only be described mathematically. We can’t picture it: Our brains don’t have enough dimensions.” Cheng Xin thought back to the conversation with the Ring again. Did you build this four-dimensional fragment? You told me that you came from the sea. Did you build the sea? “You are saying that the universe of the Edenic Age was four-dimensional, and that the speed of light was much higher?” “No, not at all. The universe of the Edenic Age was ten-dimensional. The speed of light back then wasn’t only much higher—rather, it was close to infinity. Light back then was capable of action at a distance, and could go from one end of the cosmos to the other within a Planck time.… If you had been to four-dimensional space, you would have some vague hint of how beautiful that ten-dimensional Garden must have been.” “You’re saying—” “I’m not saying anything.” Yifan seemed to have awakened from a dream. “We’ve only seen small hints; everything else is just guessing. You should treat it as a guess, just a dark myth we’ve made up.” But Cheng Xin continued to follow the course of the discussion taken so far. “—that during the wars after the Edenic Age, one dimension after another was imprisoned from the macroscopic into the microscopic, and the speed of light was reduced again and again.…” “As I said, I’m not saying anything, just guessing.” Yifan’s voice grew softer. “But no one knows if the truth is even darker than our guesses.… We are certain of only one thing: The universe is dying.” The

Civilization was like a mad dash that lasted five thousand years. Progress begot more progress; countless miracles gave birth to more miracles; humankind seemed to possess the power of gods; but in the end, the real power was wielded by time. Leaving behind a mark was tougher than creating a world. At the end of civilization, all they could do was the same thing they had done in the distant past, when humanity was but a babe: Carving words into stone.

Although her internal pain was no longer searing and heart-rending, there also was no end in sight. Suffering and depression seemed to suffuse every cell in her body, and she could no longer recall the presence of sunlight in her life.

I know you can’t. Because you’re too kind. It’s very simple. The attacker must first transform themselves into life forms that can survive in a low-dimensional universe. For instance, a four-dimensional species can transform itself into three-dimensional creatures, or a three-dimensional species can transform itself into two-dimensional life. After the entire civilization has entered a lower dimension, they can initiate a dimensional strike against the enemy without concern for the consequences.” Cheng

Cheng Xin gazed up at the giant black columns reaching into space. They lifted up the domed sky and seemed to turn the universe into a Palace of Death. Is this the ultimate end for everything? In the sky, Cheng Xin could see the end of the columns. She pointed in that direction. “So the ships entered lightspeed at the end?” “That’s right. These are only about a hundred kilometers high. We’ve seen columns even shorter than these, presumably left by ships that entered lightspeed almost instantaneously.” “Are these the most advanced lightspeed ships?” “Maybe. But this is a rarely seen technique. Death lines are usually the products of Zero-Homers.” “Zero-Homers?” “They’re also called Resetters. Maybe they’re a group of intelligent individuals, or a civilization, or a group of civilizations. We don’t know exactly who they are, but we’ve confirmed their existence. The Zero-Homers want to reset the universe and return it to the Garden of Eden.” “How?” “By moving the hour hand of the clock past twelve. Take spatial dimensions as an example. It’s practically impossible to drag a universe in lower dimensions back into higher dimensions, so maybe it’s better to work forward in the other direction. If the universe can be lowered into zero dimensions and then beyond, the clock might be reset and everything returned to the beginning. The universe might possess ten macroscopic dimensions again.

Mere existence is already the result of incredible luck. Such was the case on Earth in the past, and such has always been the case in this cruel universe. But at some point, humanity began to develop the illusion that they’re entitled to life, that life can be taken for granted. This is the fundamental reason for your defeat.

The biggest barrier to reanimating a flash-frozen body is preventing cell damage from ice crystals during the process. It's like what happens to frozen tofu: When you defrost it, it turns into a sponge. Oh, I guess most of you haven't head frozen tofu.' The expert, who was Chinese, smiled at the confused Western faces around him.

From a scientific perspective, ‘destroy’ isn’t really accurate. Nothing has disappeared. All the matter that used to be there is still there, and so is all the angular momentum. It’s only the arrangement of matter that has changed, like a deck of cards being reshuffled. But life is like a straight flush: Once you shuffle, it’s gone.

The Archean Eon was followed by the Proterozoic Eon, each billions of years; then the Paleozoic: the Cambrian’s seventy million years, the Ordovician’s sixty million years, the Silurian’s forty million years, the Devonian’s fifty million years, the Carboniferous’s sixty-five million years, and the Permian’s fifty-five million years; then the Mesozoic: the Triassic’s thirty-five million years, the Jurassic’s fifty-eight million years, and the Cretaceous’s seventy million years; then the Cenozoic: the Tertiary’s 64.5 million years and the Quaternary’s 2.5 million years. Then humanity appeared. Compared to the eons before, mankind’s history was but the blink of an eye. Dynasties and eras exploded like fireworks; the bone club tossed into the air by an ape turned into a spaceship. Finally, this 3.5-billion-year-long road full of trials and tribulations stopped in front of a tiny human individual, a single person out of the one hundred billion people who had ever lived on the Earth, holding a red switch.

Inside the grand tomb under the surface of Pluto, lit by the dim lamps that could shine for a hundred thousand years, Mona Lisa’s smile seemed to appear and disappear. The smile had puzzled humankind for nearly nine centuries, and it looked even more mysterious and eerie now, as though it meant everything and nothing, like the approaching Death.

Because of the speed of light. The known universe is about sixteen billion light-years across, and it’s still expanding. But the speed of light is only three hundred thousand kilometers per second, a snail’s pace. This means that light can never go from one end of the universe to the other. Since nothing can move faster than the speed of light, it follows that no information and motive force can go from one end of the universe to the other. If the universe were a person, his neural signals couldn’t cover his entire body; his brain would not know of the existence of his limbs, and his limbs would not know of the existence of the brain. Isn’t that paraplegia? The image in my mind is even worse: The universe is but a corpse puffing up.

Life reached an evolutionary milestone when it climbed onto land from the ocean, but those first fish that climbed onto land ceased to be fish. Similarly, when humans truly enter space and are freed from the Earth, they cease to be human. So, to all of you I say this: When you think about heading into outer space without looking back, please reconsider. The cost you must pay is far greater than you could imagine.

In contrast to this hellish but magnificent sight, the turbid water brewed a microscopic tale. Here, organic molecules were born from lightning flashes and cosmic rays, and they collided, fused, broke apart again—a long-lasting game played with building blocks for five hundred million years. Finally, a chain of organic molecules, trembling, split into two strands. The strands attracted other molecules around them until two identical copies of the original were made, and these split apart again and replicated themselves.… In this game of building blocks, the probability of producing such a self-replicating chain of organic molecules was so minuscule that it was as if a tornado had picked up a pile of metallic trash and deposited it as a fully-assembled Mercedes-Benz. But it happened, and so, a breathtaking history of 3.5 billion years had begun.

Cheng Xin awakened from the dream of the fairy tales. Something struck her heart hard, and it was almost unbearable. She said, “The universe is grand, but life is grander. We’re certain to meet again.” Only when she was done did she realize she had almost repeated Sophon’s farewell. “Then let’s pick a spot to meet, somewhere other than the Earth, somewhere in the Milky Way.” “How about at the star you gave me? Our star.” Cheng Xin didn’t even need to think. “All right. At our star!

But more commonly, the technique is used to construct the equivalents of pits and city walls. Some reduced-lightspeed belts are large enough to traverse an entire arm of a galaxy. In places where the stars are dense, many reduced-lightspeed black holes can be connected together into chains that stretch for tens of millions of light-years. That’s a Great Wall at the scale of the universe. Even the most powerful fleets, once trapped, would not be able to escape. Those barriers are very difficult to cross.

A newly formed planet appeared on the large screen. its surface was till red-hot, like a piece of charcoal fresh out of the furnace. Time passed at the rate of geological eras, and the planet gradually cooled. The color and patterns on the surface slowly shifted in a hypnotic manner. A few minutes later, an orange planet appeared on the screen, indicating the end of the simulation run. "The computations were done at the coarsest level; to do it with more precision would require over a month." Green Glasses moved the mouse and zoomed in on the surface of the planet. The view swept over a broad desert, over a cluster of strangely shaped, towering mountain peaks, over a circular depression like an impact crater. "What are we looking at?" Yang Dong asked. "Earth. Without life, this is what the surface of the planet would look like now." "But . . . where are the oceans?" "There are no oceans. No rivers either. The entire surface is dry." "Your'e saying that without life, liquid water would not exist on Earth?" "The reality would probably be even more shocking. Remember, this is only a coarse simulation, but at least you can see how much of an impact life had in the present state of the Earth." "But--" "Do you think life is nothing but a fragile, thin, soft shell clinging to the surface of this planet?" "Isn't it?" "Only if you neglect the power of time. If a colony of ants continue to move clods the size of grains of rice, they could remove all of Mount Tai in a billion years. As long as you give it enough time, life is stronger than metal and stone, more powerful than typhoons and volcanoes.

When they were about a hundred meters from the death lines, Yifan waved Cheng Xin to a stop. Each death line was about twenty or thirty meters in diameter, and from here, they resembled death columns. “These are probably the darkest things in the universe,” Cheng Xin said. The death lines showed no details except an exceptional blackness showing the boundaries of the zero-lightspeed region, with no real surface. Looking up, the lines showed up clearly even against the dark backdrop of space. “These are the deadest things in the universe as well,” said Guan Yifan. “Zero-lightspeed means absolute, one hundred percent death. Inside it, every fundamental particle, every quark is dead. There is no vibration. Even without a source of gravity inside, each death line is a black hole. A zero-gravity black hole. Anything that falls in cannot reemerge.” Yifan picked up a rock and tossed it toward one of the death lines. The rock disappeared inside the absolute darkness. “Can your lightspeed ships produce death lines?” Cheng Xin asked. “Far from it.” “So you’ve seen these before, then?” “Yes, but only rarely.” Cheng

Faced with the forlorn desolation at the world’s end, Cheng Xin nonetheless felt serenity in her heart. Not long ago, she had thought her own life had reached its terminus, but now there were many reasons to continue living. She saw a sliver of blue revealed at the edge of the leaden sky, and the sun peeked out of the opening for a few minutes, instantaneously changing this cold world. It reminded her of a line from Tianming’s stories:... as if the painter of this world-picture scattered a handful of gold dust boldly over the surface of the painting. This was her life now, hope hidden in despair, warmth felt through frost.

A new technology can transform society, but when the technology is in its infancy, very few people can see its full potential. For example, when the computer was first invented, it was merely a tool for increasing efficiency, and some thought five computers would be enough for the entire world. Artificial hibernation was the same. Before it was a reality, people just thought it would provide an opportunity for patients with terminal illnesses to seek a cure in the future. If they thought further, it would appear to be useful for interstellar voyages. But as soon as it became real, if one examined it through the lens of sociology, one could see that it would completely change the face of human civilization. All this was based on a single idea: Tomorrow will be better.

Zero dimensions! Have you seen such a thing done?” “No. We’ve only witnessed two-dimensionalization. We’ve never even seen one-dimensionalization. But somewhere, some Zero-Homers must be trying. No one knows if they’ve ever succeeded. Comparatively, it’s easier to lower the speed of light to zero, so we’ve seen more evidence of such attempts to lower the speed of light past zero and return it to infinity.” “Is that even theoretically possible?” “We don’t know. Maybe the Zero-Homers have theories that say yes, but I don’t think so. Zero-lightspeed is an impassable wall. Zero-lightspeed is absolute death for all existence, the cessation of all motion. Under such conditions, the subjective cannot influence the objective in any way, so how can the ‘hour hand’ be shifted past it? I think the Zero-Homers are practicing a kind of religion, a kind of performance art.” Cheng

Cheng Xin stared at the death lines, her terror mixed with awe. “If these are trails, why don’t they spread?” Guan Yifan clutched Cheng Xin’s arm. “I was just getting to that. We’ve got to get out of here. Leave not just Planet Gray, but the entire system. This is a very dangerous place. Death lines are not like regular trails. Without disturbance, they’ll stay like this, with a diameter equal to the effective surface of the curvature engine. But if they’re disturbed, they’ll spread very rapidly. A death line of this size can expand to cover a region the size of a solar system. Scientists call this phenomenon a death line rupture.” “Does a rupture make the speed of light zero in the entire region?” “No, no. After rupture, it turns into a regular trail. The speed of light inside goes up as the trail dissipates over a wider region, but it will never be much more than a dozen meters per second. After these death lines expand, this entire system might turn into a reduced-lightspeed black hole, or a black domain.… Let’s go.” Cheng Xin and Guan Yifan turned toward the shuttle and began to run and leap. “What kind of disturbance makes them spread?” Cheng Xin asked. She turned to give the death lines another glance. Behind them, the five death lines cast long shadows that stretched across the plain to the horizon. “We’re not sure. Some theories suggest that the appearance of other curvature trails nearby would cause disturbance. We’ve confirmed that curvature trails within a short distance can influence each other.” “So, if Halo accelerates—” “That’s why we must get farther away using only the fusion engine before engaging the curvature engine. We’ve got to move … using your units of measurement … at least forty astronomical units away.” After

In each other’s eyes, they saw the dark future for the great universe. In perpetual expansion, all the galaxies would move farther away from each other until none were visible from any other. By then, standing at any point in the universe, all one would see was darkness in every direction. The stars would go out one by one, and all celestial bodies would turn into thin dust clouds. Coldness and darkness would reign over all, and the universe would become a vast, empty tomb. All civilizations and all memories would be buried in that endless tomb for eternity. Death would be eternal. The only way to prevent this future was to return the matter locked up in all the mini-universes constructed by all the civilizations. But such a decision meant that the mini-universes would not survive, and all the refugees in the mini-universes had to return to the great universe. That was the meaning of the name of the Returners’ movement. The

In this cosmic arena, Luo Ji faced not the fancy moves of Chinese sword fighting, resembling dance more than war; nor the flourishes of Western sword fighting, designed to show off the wielder’s skill; but the fatal blows of Japanese kenjutsu. Real Japanese sword fights often ended after a very brief struggle lasting no more than half a second to two seconds. By the time the swords had clashed but once, one side had already fallen in a pool of blood. But before this moment, the opponents stared at each other like statues, sometimes for as long as ten minutes. During this contest, the swordsman’s weapon wasn’t held by the hands, but by his heart. The heart-sword, transformed through the eyes into the gaze, stabbed into the depths of the enemy’s soul. The real winner was determined during this process: In the silence suspended between the two swordsmen, the blades of their spirits parried and stabbed as soundless claps of thunder. Before a single blow was struck, victory, defeat, life, and death had already been decided.

Cheng Xin’s eyes moistened. She was thinking of Tianming, of the man who struggled alone in the long night of outer space and an eerie, sinister alien society. To convey his important message to the human race, he must have racked his brain until he had devised such a metaphorical system, and then spent ages in his lonely existence to create over a hundred fairy tales and carefully disguise the intelligence report in three of those stories. Three centuries ago, he had given Cheng Xin a star; now, he brought hope to the human race. Thereafter, steady progress was made in deciphering the message. Other than the discovery of the metaphorical system, the effort was also aided by another guess that was commonly accepted, though unconfirmed: While the first part of the message to be successfully deciphered involved escape from the Solar System, the rest of the message likely had to do with the safety notice. The interpreters soon realized that compared to the first bit of intelligence, the rest of the information hidden in the three stories was far more complex. At

After the shuttle took off, Cheng Xin continued to stare at the receding death lines. She said, “The Zero-Homers give me a bit of hope.” Yifan said, “The universe contains multitudes. You can find any kind of ‘people’ and world. There are idealists like the Zero-Homers, pacifists, philanthropists, and even civilizations dedicated only to art and beauty. But they’re not the mainstream; they cannot change the direction of the universe.” “It’s just like the world of humans.” “At least the Zero-Homers’ task will ultimately be completed by the cosmos itself.” “You mean the end of the universe?” “That’s right.” “But based on what I know, the universe will continue to expand, and become sparser and colder forever.” “That’s the old cosmology you know, but we’ve disproved it. The amount of dark matter had been underestimated. The universe will stop expanding and then collapse under gravity, finally forming a singularity and initiating another big bang. Everything will return to zero, or home. And so Nature remains the final victor.” “Will the new universe have ten dimensions?” “Who knows? There are infinite possibilities. That’s a brand-new universe, and a brand-new life.” *

You don’t need to pity them. Really, let me tell you: don’t. The reality of the universe is not something to envy.” “Why?” Yifan lifted a hand and pointed at the stars of the galaxy. Then he let the 3G force pull his arm back to this chest. “Darkness. Only darkness.” “You mean the dark forest state?” Guan Yifan shook his head, a gesture that appeared to be a struggle in hypergravity. “For us, the dark forest state is all-important, but it’s just a detail of the cosmos. If you think of the cosmos as a great battlefield, dark forest strikes are nothing more than snipers shooting at the careless—messengers, mess men, etc. In the grand scheme of the battle, they are nothing. You have not seen what a true interstellar war is like.” “Have you?” “We’ve caught a few glimpses. But most things we know are just guesses.… Do you really want to know? The more you possess of this kind of knowledge, the less light remains in your heart.” “My heart is already completely dark. I want to know.” And so, more than six centuries after Luo Ji had fallen through ice into that lake, another dark veil hiding the truth about the universe was lifted before the gaze of one of the only survivors of Earth civilization. Yifan asked, “Why don’t you tell me what the most powerful weapon for a civilization possessing almost infinite technological prowess is? Don’t think of this as a technical question. Think philosophy.” Cheng Xin pondered for a while and then struggled to shake her head. “I don’t know.” “Your experiences should give you a hint.” What had she experienced? She had seen how a cruel attacker could lower the dimensions of space by one and destroy a solar system. What are dimensions? “The universal laws of physics,” Cheng Xin said. “That’s right. The universal laws of physics are the most terrifying weapons, and also the most effective defenses. Whether it’s by the Milky Way or the Andromeda Galaxy, at the scale of the local galactic group or the Virgo Supercluster, those warring civilizations possessing godlike technology will not hesitate to use the universal laws of physics as weapons. There are many laws that can be manipulated into weapons, but most commonly, the focus is on spatial dimensions and the speed of light. Typically, lowering spatial dimensions is a technique for attack, and lowering the speed of light is a technique for defense. Thus, the dimensional strike on the Solar System was an advanced attack method. A dimensional strike is a sign of respect. In this universe, respect is not easy to earn. I guess you could consider it an honor for Earth civilization.

Later, my responsibilities became more complicated: I wanted to endow humans with lightspeed wings, but I also had to thwart that goal to prevent a war. I don’t know how much those catastrophes and the final destruction of the Solar System had to do with me. Those are questions that could never be answered definitively. But I’m certain they had something to do with me, with my responsibilities. And now, I’ve climbed to the apex of responsibility: I am responsible for the fate of the universe. Of course this responsibility doesn’t belong only to me and Guan Yifan, but we own a share of the responsibility, a share of something that I never could have imagined. I want to tell all those who believe in God that I am not the Chosen One. I also want to tell all the atheists that I am not a history-maker. I am but an ordinary person. Unfortunately, I have not been able to walk the ordinary person’s path. My path is, in reality, the journey of a civilization. And now we know that this is the journey that must be made by every civilization: awakening inside a cramped cradle, toddling out of it, taking flight, flying faster and farther, and, finally, merging with the fate of the universe as one. The ultimate fate of all intelligent beings has always been to become as grand as their thoughts.

I created a sphere in this infinite space for myself: not too big, though possessing mass. My mental state didn’t improve, however. The sphere floated in the middle of “emptiness”—in infinite space, anywhere could be the middle. The universe had nothing that could act on it, and it could act on nothing. It hung there, never moving, never changing, like a perfect interpretation for death. I created a second sphere whose mass was equal to the first one’s. Both had perfectly reflective surfaces. They reflected each other’s images, displaying the only existence in the universe other than itself. But the situation didn’t improve much. If the spheres had no initial movement—that is, if I didn’t push them at first—they would be quickly pulled together by their own gravitational attraction. Then the two spheres would stay together and hang there without moving, a symbol for death. If they did have initial movement and didn’t collide, then they would revolve around each other under the influence of gravity. No matter what the initial conditions, the revolutions would eventually stabilize and become unchanging: the dance of death. I then introduced a third sphere, and to my astonishment, the situation changed completely. Like I said, any geometric figure turns into numbers in the depths of my mind. The sphereless, one-sphere, and two-sphere universes all showed up as a single equation or a few equations, like a few lonesome leaves in late fall. But this third sphere gave “emptiness” life. The three spheres, given initial movements, went through complex, seemingly never-repeating movements. The descriptive equations rained down in a thunderstorm without end. Just like that, I fell asleep. The three spheres continued to dance in my dream, a patternless, never-repeating dance. Yet, in the depths of my mind, the dance did possess a rhythm; it was just that its period of repetition was infinitely long. This mesmerized me. I wanted to describe the whole period, or at least a part of it. The

What you’re saying makes no sense. At least, it doesn’t make sense to lower spatial dimensions as a weapon. In the long run, that’s the sort of attack that would kill the attacker as well as the target. Eventually, the side that initiated attack would also see their own space fall into the two-dimensional abyss they created.” Nothing but silence. After a long while, Cheng Xin called out, “Dr. Guan?” “You’re too … kind-hearted,” Guan Yifan said softly. “I don’t understand—” “There’s a way for the attacker to avoid death. Think about it.” Cheng Xin pondered and then said, “I can’t figure it out.” “I know you can’t. Because you’re too kind. It’s very simple. The attacker must first transform themselves into life forms that can survive in a low-dimensional universe. For instance, a four-dimensional species can transform itself into three-dimensional creatures, or a three-dimensional species can transform itself into two-dimensional life. After the entire civilization has entered a lower dimension, they can initiate a dimensional strike against the enemy without concern for the consequences.” Cheng Xin was silent again. “Are you reminded of anything?” Yifan asked. Cheng Xin was thinking of more than four hundred years ago, when Blue Space and Gravity had stumbled into the four-dimensional fragment. Yifan had been a member of the small expedition that conversed with the Ring. Did you build this four-dimensional fragment? You told me that you came from the sea. Did you build the sea? Are you saying that for you, or at least for your creators, this four-dimensional space is like the sea for us? More like a puddle. The sea has gone dry. Why are so many ships, or tombs, gathered in such a small space? When the sea is drying, the fish have to gather into a puddle. The puddle is also drying, and all the fish are going to disappear. Are all the fish here? The fish responsible for drying the sea are not here. We’re sorry. What you said is really hard to understand. The fish that dried out the sea went onto land before they did this. They moved from one dark forest to another dark forest. “Is it worth it to pay such a price for victory in war?” Cheng Xin asked. She could not imagine how it was possible to live in a world of one fewer dimension. In two-dimensional space, the visible world consisted of a few line segments of different lengths. Could anyone who was born in three-dimensional space willingly live in a thin sheet of paper with no thickness? Living in three dimensions must be equally confining and unimaginable for those born to a four-dimensional world. “It’s better than death,” said Yifan. While

On the day of the universe’s Last Judgment, two humans and a robot belonging to the Earth and Trisolaran civilizations embraced each other in ecstasy.