Death's End

by Cixin Liu

  “But it’s not time yet for our scheduled report. A report now would be treated as an alarm.”

  “This is an alarm! We have to tell people not to expose us.”

  “That’s a bit of a stretch. We’ve just begun researching lightspeed ships. It would be impressive if we managed to build one in half a century.”

  “But what if an initial test generates such a trail? Maybe they’re already conducting such trials somewhere in the Solar System!”

  And so this information was transmitted to Fleet Command with an alarm-level neutrino beam, then passed on to the PDC. There, it was leaked and mistaken as a photoid attack alarm, which caused the global panic two days later.

  The curvature trails were left behind when ships entered lightspeed, just as a rocket launching from the ground left burn marks on the launch pad. Once the ship was at lightspeed, it continued to coast by inertia, and left no more trails. It was a reasonable conjecture that dropping out of lightspeed would leave behind similar marks. It was still unknown how long such trails would persist in space. A guess was that the trails represented some kind of distortion in space due to curvature propulsion, and might last a long time—maybe even forever.

  It was reasonable to conclude that Sophon had claimed Trisolaris appeared more dangerous than the Solar System when observed from a distance because of the ten-AU-diameter curvature propulsion trail left behind within the Trisolaran system, which is what caused the dark forest strike against Trisolaris to come so quickly. The trail and the broadcast of Trisolaris’s location mutually provided confirmation and made the danger value of the Trisolaran system skyrocket.

  During the following month, Observation Unit #1 discovered six more curvature propulsion trails in different parts of space. All of these were approximately spherical, though their sizes varied widely, ranging from fifteen to two hundred AU. One of these bubbles was only six thousand AU from the Solar System, apparently the mark left by the Second Trisolaran Fleet as it dropped out of lightspeed. The directions and distances of the other trails, however, seemed to indicate that they had nothing to do with the Second Trisolaran Fleet. It appeared that curvature propulsion trails were common in the universe.

  After Blue Space and Gravity’s discovery inside the four-dimensional space fragment, this provided yet more direct evidence that large numbers of highly intelligent civilizations existed in the cosmos.

  One of the trails was only 1.4 light-years from the Sun, close to the Oort Cloud. A spaceship had apparently lingered there and then left by entering lightspeed. No one knew when this had happened.

  The discovery of the curvature propulsion trail finally eliminated lightspeed space flight, already facing mounting skepticism, from consideration as a viable plan. Fleet International and the UN quickly enacted legislation prohibiting any further research and development of curvature propulsion, and the nation states followed suit. This was the most severe legal restriction against a technology since the nuclear nonproliferation treaties of three centuries ago.

  Humanity now had only two choices left: the Bunker Project and the Black Domain Plan.

  Excerpt from A Past Outside of Time

  Terror of the Endless Night

  Superficially, research and development of lightspeed spaceflight died for obvious reasons: to avoid advance exposure of the existence of Earth civilization by the trails generated from curvature propulsion, and to prevent increasing the Solar System’s danger value in the eyes of observers elsewhere in the cosmos, either of which might have led to an earlier dark forest strike. But there were deeper reasons, too.

  From the Common Era to the end of the Crisis Era, humanity looked at the stars with hope. But the first few steps they took toward the stars resulted in failure and pain. The tragic Doomsday Battle revealed the extent of humanity’s fragility in the cosmos, and the internecine warfare of the Battle of Darkness had injured the human spirit in equal measure. Later events, such as the judgment of Bronze Age and the hijacking of Gravity by Blue Space, resulting in the universal broadcast, all deepened these wounds and elevated the pain to the level of philosophy.

  As a matter of fact, most of the general public was relatively uninvested in the quest for lightspeed spaceships. They believed that even if such ships could be built within their lifetimes, they would have no chance of making use of them.

  They cared far more about the Bunker Project, which seemed the most practical path to survival. To be sure, they also cared for the Black Domain Plan, because three centuries of horror had infused them with a strong desire for a serene life, and the Black Domain Plan promised just such a life. Although people were disappointed at the prospect of being sealed off from the rest of the universe, the Solar System itself was large enough that the disappointment was tolerable. The reason they were more interested in the Bunker Project than the Black Domain Plan was because even laypeople could see the extreme technical challenges of slowing down lightspeed, and generally agreed that it was unlikely for mere Man to complete God’s Engineering Project.

  On the other hand, both staunch opponents and fervent supporters of lightspeed spaceships belonged to the elite classes of society.

  The faction in support of researching lightspeed spaceflight believed that the ultimate security of the human race required expansion into the Milky Way and settlement among the stars. In this unfeeling cosmos, only outward-facing civilizations had a chance of survival, and isolationism ultimately led to annihilation. Those who held such views generally did not oppose the Bunker Project, but passionately despised the Black Domain Plan, viewing it as an attempt to dig humankind’s own grave. Even though they conceded that a black domain would guarantee the long-term survival of the human race, they saw such life as death for the civilization.

  The faction opposed to researching lightspeed vessels felt this way for political reasons. They believed that human civilization had suffered many trials before reaching a nearly ideal democratic society, but once humanity headed for space, it would inevitably regress socially. Space was like a distorting mirror that magnified the dark side of humanity to the maximum. A line from one of the Bronze Age defendants, Sebastian Schneider, became their slogan:

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

  For a democratic, civilized Earth to scatter innumerable seeds of totalitarianism among the Milky Way was a prospect that these people found intolerable.

  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.

  Broadcast Era, Year 8

  Sun-Earth Lagrangian Point

  Cheng Xin once again returned to the point in space where the Sun’s and the Earth’s gravities balanced each other out. A year had passed since the meeting with Yun Tianming, and she was far more relaxed for this trip. She was here as a volunteer for the Bunker Project simulation test.

  Fleet International and the UN conducted this simulation jointly. Its goal was to test the effectiveness of the giant planets as barriers in the event of a solar explosion.

  A supersized hydrogen bomb would play the role of the exploding sun. The power of nuclear bombs was no longer measured in TNT-equivalents, but this bomb’s yield would be approximately three hundred megatons. In order to more realistically simulate the physical conditions of a solar explosion, the hydrogen bomb was wrapped in a thick shell to mimic the solar material that would be thrown off by the explosion. The eight planets were modeled with fragments of asteroids. Of these, the four asteroids modeling terrestrial planets were around ten meters in diameter; the ones modeling the gas giants were far bigger, each around one hundred meters in diameter. The eight fragments were positioned around the hydrogen bomb at distances that replicated the relative distances of the planets, so that the entire system resembled a miniature Solar System. “Mercury,” which was closest, was about four kilometers fro
m the “Sun,” and “Neptune,” which was farthest, was about three hundred kilometers away. The test was conducted at the Lagrangian point to minimize the effects of the Sun’s and the planets’ gravities so that the system could remain stable for some time.

  Scientifically, this experiment wasn’t really necessary. Computer modeling based on existing data was more than adequate to produce results that could be trusted. Even if physical tests had to be done, they could have taken place in a laboratory. Though the scale would have to be smaller, careful design would have yielded considerable precision. As a science experiment, this large-scale simulation in space was clumsy to the point of being idiotic.

  But the experimenters who had envisioned, designed, and implemented the simulation understood that the ultimate goal of this trial wasn’t science. It was actually an expensive propaganda effort to stabilize international faith in the Bunker Project. The trial had to be direct and visually impactful, so that it could be broadcast to the world.

  After the total rejection of any further research into lightspeed spaceflight, conditions on Earth resembled the beginning of the Crisis Era. Back then, global defense against the Trisolaran invasion expended effort in two areas: one was the mainstream plan of constructing the Solar System’s defenses, and the other was the Wallfacer Project. Now, humankind’s mainstream survival plan was the Bunker Project, and the Black Domain Plan, like the Wallfacer Project, was a gamble filled with unknowns. The plans were carried out in parallel, but since only theoretical research was possible on black domains, limited resources were committed. The Bunker Project, on the other hand, extensively impacted all of human society, and great effort had to be expended to secure the public’s support.

  It would have been sufficient to leave monitoring equipment behind the rocky fragments, in order to test the shielding effects of the “gas giants,” or perhaps animal subjects. But in order to ensure a sensational reaction, the organizers decided that live human subjects were necessary, and so a global effort was undertaken to recruit volunteers.

  艾 AA was the one who suggested Cheng Xin send in an application. AA believed that this was an excellent opportunity to do some free marketing to burnish the Halo Group’s public image in preparation for entry into the Bunker Project. She and Cheng Xin also both understood that the trial had been planned carefully. It might look unsettling, but there was basically no danger.

  Cheng Xin’s spacecraft stopped in the shadow of the fragment representing Jupiter. This irregular asteroid was shaped like a potato. It was about 110 meters long, with an average width of around seventy meters. Over a period of two months, the asteroid had been pushed from its home in the asteroid belt to here. During its voyage, some artistic engineer who had too much time on his hands had painted it with colorful bands similar to the ones on the real Jupiter, including the Great Red Spot. Overall, however, the painted asteroid did not resemble Jupiter, but some space monster with a Cyclopean red eye.

  As on her last voyage, Cheng Xin’s spacecraft flew against the brilliant sun, but once it entered the shadow of the asteroid, everything darkened immediately, because there was no air in space to scatter the sunlight. The Sun on the other side of the asteroid might as well not have existed. Cheng Xin felt she was at the foot of a cliff at midnight.

  Even without the barrier of the asteroid, it would have been impossible to see the hydrogen bomb simulating the Sun fifty kilometers away. But in the other direction, she could see the simulated “Saturn.” By scale, it was just about a hundred kilometers from the “Sun” and fifty kilometers from “Jupiter.” It was about the same size as this asteroid fragment, and, illuminated by the real Sun, stood out against the backdrop of space so that Cheng Xin could just tell its shape. She could also see “Uranus” about two hundred kilometers away, though that was just a shiny dot, hard to tell apart from the stars. The rest of the “planets” were invisible.

  Along with Cheng Xin’s dinghy, about nineteen other space vessels were parked behind “Jupiter.” Together, these simulated the twenty planned Jovian space cities. The spaceships were lined up in three rows behind the asteroid, and Cheng Xin was in the front-most row, about ten meters from the asteroid. More than a hundred volunteers were seated in the ships. Originally, AA had planned to come with Cheng Xin, but company business kept her away. Thus, Cheng Xin’s dinghy might be the only one sheltered behind “Jupiter” with a lone passenger.

  They could see the bright blue Earth about 1.5 million kilometers away. More than three billion people there were watching a live broadcast of the trial.

  The countdown indicated that about ten minutes remained before the start of the detonation. The communications channels quieted. Abruptly, a man’s voice spoke up.

  “Hello. I’m next to you.”

  Cheng Xin shuddered as she recognized the voice. Her dinghy was at one end of the five vessels in the first row. Looking to her right, she saw a spherical dinghy very similar to the one she had ridden in a year ago parked right next to hers. Almost half the hull was transparent, and she could see five passengers inside. Thomas Wade was sitting on the side closest to her, and waved at her. Cheng Xin was able to recognize him right away because, unlike the other four passengers, he wasn’t wearing a lightweight space suit; instead, he wore only his black leather jacket, as if to show his contempt for space. His sleeve remained empty, indicating that he still had not gotten a prosthetic hand.

  “Let’s dock so I can come over,” Wade said. Without waiting for Cheng Xin to agree, he initiated the docking sequence. The dinghy he was in started its maneuvering thrusters and slowly approached Cheng Xin’s dinghy. Reluctantly, Cheng Xin initiated the docking procedure as well. After a slight tremor, the two ships were connected, and both sets of cabin doors slid open noiselessly. As the pressure between the two ships equalized, Cheng Xin’s ears popped.

  Wade floated over. He couldn’t have had much experience in space, but like Cheng Xin, he moved as though he was born to it. Though he had only one hand, his movements in weightlessness were steady and firm, as though gravity still worked on him. The interior of the cabin was dim. Sunlight, reflected from the Earth, was deflected again by the asteroid into the dinghy. In this obscure light, Cheng Xin looked Wade over and found him not much changed by the intervening eight years. He still looked pretty much the same as he had in Australia.

  “What are you doing here?” Cheng Xin asked, trying to keep her voice cool. But she always seemed to have trouble maintaining her composure in front of this man. After what she had gone through the last few years, everything in her heart had been polished until it was as smooth as the asteroid in front of her, but Wade remained a singular sharp corner.

  “I finished my sentence a month ago.” Wade took half of a cigar from his jacket pocket—though he couldn’t light it here. “It was reduced. A murderer, out in eleven years—I know that’s not fair … to you.”

  “We all have to follow the law. There’s nothing unfair about that.”

  “Follow the law in everything? Including lightspeed propulsion?”

  Just like before, Wade got straight to the point without wasting any time. Cheng Xin didn’t answer.

  “Why do you want lightspeed ships?” Wade asked. He turned and stared at Cheng Xin brazenly.

  “Because that is the only choice that makes humankind grand,” Cheng Xin said. She met his gaze fearlessly.

  Wade nodded and took the cigar out of his mouth. “Very good. You’re grand.”

  Cheng Xin looked at him, her eyes asking the unspoken question.

  “You know what is right, and you have the courage and sense of duty to do it. This makes you extraordinary.”

  “But?” Cheng Xin prompted.

  “But, you don’t have the skill or the will to complete this task. We share the same ideal. I also want to see lightspeed ships built.”

  “What are you trying to say?”

  “Give it to me.”

  “Give what to you?”

  “Everything
you own. Your company, your wealth, your authority, your position—and if possible, your reputation and glory. I will use them all to build lightspeed ships, for your ideals, and for the grandness of the human spirit.”

  The thrusters of the dinghy came on again. Although the asteroid generated little gravity, it was still enough to make the dinghy fall toward it slowly. The thrusters pushed the dinghy away from the rock until it returned to its assigned location. The plasma nozzle illuminated the surface of the asteroid fragment, and the red spot painted on it looked like a suddenly opened eye. Cheng Xin’s heart tensed, whether due to this eye or Wade’s words. Wade stared back at the giant eye, his gaze sharp and cold, with a hint of mockery.

  Cheng Xin said nothing. She couldn’t think of anything to say.

  “Don’t make the same mistake a second time,” Wade said. Each word struck Cheng Xin’s heart like a heavy hammer.

  It was time: The hydrogen bomb exploded. Without the obstruction of an atmosphere, nearly all of its energy was released in the form of radiation. In the live feed taken from about four hundred kilometers away, a fireball appeared next to the Sun. Soon, the brightness and size of the fireball exceeded the Sun itself, and the camera’s filters quickly dimmed the light. If someone were to gaze at it directly from this distance, he or she would be blinded permanently. By the time the fireball reached maximum brightness, there was nothing in the camera’s view but pure whiteness. The flame seemed ready to swallow the entire universe.

  Sheltered in the shadow of the giant rock, Cheng Xin and Wade did not witness this sight. The live broadcast feed was shut off within the cabin, but they could see “Saturn” behind them increase in brightness abruptly. Next, the molten lava generated on the side of “Jupiter” facing the “Sun” flew around them. The lava glowed red as it dripped away from the edge of the asteroid, but after it flew some distance away, the reflected light from the nuclear detonation exceeded its inherent red glow, and the thin dribbles of lava turned into brilliant fireworks. The view from the dinghy resembled the view from the top of a silvery waterfall tumbling down toward the Earth. By now, the four smaller asteroid fragments simulating the terrestrial planets had been incinerated, and the four larger asteroid fragments simulating the gas giants behaved as four scoops of ice cream being heated on one side by a blowtorch. The side facing the detonation melted and turned into a smooth hemisphere, and every “planet” dripped a silvery tail of lava. More than ten seconds after the radiation reached “Jupiter,” the simulated stellar material, consisting of pieces of the exploded shell of the hydrogen bomb, struck the massive asteroid fragment, causing it to quake and drift slowly away from the “Sun.” The dinghy’s thrusters activated and maintained distance from the fragment.