by Cixin Liu
A few statues were scattered on the lawn next to the ruin. Cheng Xin’s attention was drawn to one of the statues: A gauntleted hand was picking wreaths woven with stars out of a pool with a sword, and flowing water dripped from the wreaths continuously. This sight triggered something deep in Cheng Xin’s memory, but she couldn’t recall where exactly she had seen it before. She gazed at the statue from the motorcar until it disappeared.
The car stopped in front of a blue building. It was a laboratory marked with a sign: “Academy of Engineering, Basic Technology 021.” Cheng Xin saw Wade and Bi Yunfeng on the lawn in front of the laboratory.
Wade had never entered hibernation since taking over the Halo Group, and was now 110 years old. He kept his hair and beard short, but both were now white as snow. He didn’t use a cane, and his stride was steady, but his back was a bit bent, and one of his sleeves still hung empty. In the moment they locked gazes, Cheng Xin understood that time had not defeated this man. What was at his core had not been worn away by the passing years, but had only become more prominent—like a rock revealed after the snow and ice had melted away.
Bi Yunfeng should be much younger than Wade, but he looked older. He was very excited to see Cheng Xin and seemed eager to show her something.
“Hello, little girl,” Wade said. “I’m now three times your age.” His smile still couldn’t make Cheng Xin warm, but it no longer felt as cold as ice water.
Cheng Xin faced these two old men with mixed feelings. They had struggled for their ideals for more than sixty years and were now near the end of their lives’ journeys. She, on the other hand, had gone through so many trials after awakening for the first time during the Deterrence Era—but in reality, she had spent no more than four years out of hibernation. She was now 33, still a young woman in this era where average life expectancy was 150.
Cheng Xin greeted the two, and then no one wasted time by saying more. Wade led Cheng Xin into the laboratory with Bi Yunfeng and Cao Bin following. They entered a spacious, windowless hall. The familiar acrid odor of static told Cheng Xin they were in a sophon-free room. After more than sixty years, people still could not be sure that the sophons had left the Solar System, and maybe they’d never be sure. The hall must have been filled with instruments and equipment not long ago, but now all the lab equipment was scattered in a chaotic pile next to the walls, as though it had been moved away in a hurry to clear out the center. In the middle of the hall was a single machine. The surrounding chaos and the emptiness in the center displayed an irrepressible excitement, as though a team of treasure hunters had suddenly found a priceless artifact, tossed their tools to the side, and carefully moved their prize to the center of the open space.
The machine’s complex structure reminded Cheng Xin of a tokamak from the Common Era, but miniaturized. The bulk of the machine consisted of a sphere bisected horizontally by a flat black metallic plane that extended several meters over the edge of the sphere. The plane, holding up the sphere at about waist-height, also served as a lab bench with sturdy legs. The surface of the bench was mostly empty save for a few tools and manipulators attached to telescoping arms.
The metal hemisphere below the bench was studded with tubes of various thicknesses, all aimed at the invisible center of the sphere, causing the machine to look like a naval mine studded with Hertz horns. Apparently, the arrangement was designed to concentrate some kind of energy at the center.
The hemisphere above the bench, in contrast, was made of transparent glass. The two hemispheres together formed a whole divided by the metal plane, contrasting simple transparency with complex opacity.
Looking down through the glass dome, Cheng Xin could see a small rectangular metallic platform whose sides measured only a few centimeters, about the size of a pack of cigarettes, and whose surface was smooth and reflective like a mirror. The platform under the glass dome was like a tiny, delicate stage; and the complicated mechanism below the plane the orchestra that would accompany the performance, though it was unimaginable what that performance would be.
“Let’s allow a physical part of you to experience this grand moment,” Wade said. Bi Yunfeng lifted the glass dome as Wade walked over to Cheng Xin and held up a pair of scissors. Cheng Xin tensed, but did not shy away. Carefully, assisted by a tool on the platform, Wade lifted a strand of her hair and cut off a small section at the end. He held the hair clipping with the tool, examined it, and concluded it was still too long. He cut the clipping in half so that the remaining piece was only about two or three millimeters long, almost invisible. Wade walked over to the side of the opened glass dome and carefully placed the hair on the smooth metal platform. Although Wade was over a hundred years of age and had only one hand, his movements were precise and steady, showing no tremors.
“Come, watch carefully,” Wade said.
Cheng Xin leaned down to look through the glass dome. She could see her hair resting against the smooth stage. There was a red line down the middle of the stage, and the hair was on one side of it.
Wade nodded at Bi Yunfeng, who opened a control window in the air and activated the machine. Cheng Xin looked down and saw that a few tubes connected to the machine began to glow red, reminding her of the glimpse she had caught of the inside of the Trisolaran spaceship. She heard a rumbling but didn’t feel any heat. She returned her gaze to the small platform and felt some invisible disturbance spread out from the platform, brushing across her face like a light breeze. She couldn’t be sure it wasn’t just an illusion.
She saw that her hair had moved to the other side of the red line, but she hadn’t seen it move.
After another series of rumblings, the machine stopped.
“What did you see?” Wade asked.
“You spent half a century to move a three-millimeter section of hair two centimeters,” said Cheng Xin.
“It was curvature propulsion,” Wade said.
“If we used the same technique to continue to accelerate the hair, it would be moving at lightspeed in about ten meters,” Bi Yunfeng said. “Of course we can’t achieve this now, and we dare not try it here. If we did, this bit of hair, moving at lightspeed, would destroy Halo City.”
Cheng Xin pondered the strand of hair that had been moved two centimeters by curving space. “You are saying that you’ve invented gunpowder and managed to make a firecracker, but the ultimate goal is to make a space rocket. A thousand years may separate those two achievements.”
“Your analogy is flawed,” Bi Yunfeng said. “We have invented the equation relating energy to mass, and we’ve discovered the principle of radioactivity. The ultimate goal is to make the atom bomb. Only a few decades divide those two achievements.”
“In fifty years, we should be able to construct curvature propulsion spaceships capable of lightspeed flight. This will require massive amounts of technical testing and development work. We have to lay our cards on the table now so that the government can back off and give us the environment necessary to carry out these tasks.”
“But your current approach will make you lose everything.”
“Everything depends on your decision,” Wade said. “You must think that we’re helpless against the power of that fleet out there. Not so.” He gestured at the door. “Come in.”
A group of forty or fifty armed men filed in and soon filled the hall. They were all young men dressed in black space camouflage, and their presence seemed to make the hall dimmer. They wore military-issue lightweight space suits that seemed no different from ordinary military uniforms, but they could enter space as soon as they put on helmets and life-support backpacks. Cheng Xin was astonished, however, to see the weapons they carried: rifles, from the Common Era. Perhaps they were newly made, but the design was ancient and entirely mechanical, with manual bolts and triggers. The ammunition they carried confirmed this: Everyone wore two crossed bandoliers filled with glistening yellow cartridges.
To see these men in this age was akin to seeing a group of men armed with bows and swords
during the Common Era. This was not to say that the fighters did not appear visually intimidating. Cheng Xin felt the presence of the past not only because of their ancient weapons, but also their appearance. They displayed a trained esprit de corps: they were uniform not only in dress and equipment, but also in their spirit. The men appeared tough and strong, with muscles bulging beneath their thin space suits. The gazes and expressions on their bold, angular faces were very similar: an indifferent, metallic grimness that viewed life as cheap as grass.
“This is our city self-defense force.” Wade waved at the assembled men. “They are all we have to protect Halo City and the ideal of the lightspeed ship. You can see almost all of them here—there are a few more outside, but the total is no more than a hundred. As for their equipment—” Wade took a rifle from one of the soldiers and pulled the bolt. “You can trust your eyes: ancient weapons constructed of modern materials. The bullets do not rely on gunpowder as the propellant and have much better range and precision compared to genuine ancient weapons. In space, these rifles can hit a ship from two thousand kilometers away, but fundamentally, they’re primitive weapons. You must think this ridiculous, and I would, too, except for one thing.” He returned the rifle to the soldier and pulled one of the cartridges from his bandolier. “As I said, the cartridges are basically of ancient design, but the bullets are new. So new, in fact, that they might as well come from the future. The bullet is a superconducting container and the interior is a pure vacuum. A magnetic field suspends a small ball in the middle to prevent it from contacting the bullet’s body. The ball is made of antimatter.”
Bi Yunfeng’s voice was filled with pride. “The circumsolar particle accelerator was not only used for basic research experiments, but also to produce antimatter. In the last four years, we’ve used it to make antimatter practically the entire time. We now possess fifteen thousand bullets of this design.”
The primitive-seeming cartridge held in Wade’s hand now caused Cheng Xin to suffer chills. She now worried about the reliability of the containment magnetic field within that superconducting bullet: a single malfunction would be enough to cause the complete destruction of Halo City in a brilliant flash. She looked at the golden bandoliers hanging over the chests of every soldier: These were the chains of the god of Death. A single bandolier possessed enough power to destroy the entire Bunker World.
Wade continued, “We don’t even have to go into space to attack. We just have to wait until the fleet approaches the city. We can shoot dozens or even hundreds of bullets at each of the twenty or so ships—a single hit is enough to destroy it. Although the tactic is primitive, it’s effective and flexible. A single soldier with a gun is a fighting unit capable of threatening an entire warship. Also, we have agents in other space cities with handguns.” He returned the cartridge to the soldier’s bandolier. “We don’t want war. During the final negotiations, we’ll show our weapons to the Federation envoy and explain our tactics. We hope the Federation Government will weigh the costs of war and abandon their threat against Halo City. We’re not asking for much, only to build a research center several hundred AU from the Sun devoted to curvature propulsion testing.”
“But if we go to war, can you guarantee victory?” Cao Bin asked. He had not spoken so far. Unlike Bi Yunfeng, he apparently was not in favor of war.
“No,” Wade answered calmly. “But neither can they. We can only try.”
As soon as Cheng Xin saw the antimatter bullet in Wade’s hand, she knew what she must do. She wasn’t too worried about the Federation Fleet—she believed that they’d come up with ways to deal with this tactic. Her mind was focused on only one thing:
Also, we have agents in other space cities with handguns.
If war were to erupt, any of the guerrilla fighters hidden in the other space cities could casually shoot one of the antimatter bullets at the ground and the explosion of matter-antimatter annihilation would instantaneously tear apart the thin shell of the city and incinerate everything within. Next, the spinning space city would break into fragments and millions would die.
Space cities were as fragile as eggs.
Wade had not explicitly said that he would attack the space cities, but he also hadn’t said he wouldn’t. She again saw Wade aiming a gun at her 133 years ago—an image which had been branded into her heart. She didn’t know how cold a man would have to be to make such a decision, but the core of this man was the utter madness and coldness brought about by extreme rationality. She seemed to see again the young Wade from three centuries ago, screaming like a crazy beast: “Advance, advance without regard for consequences!”
Even if Wade did not want to attack the space cities, what if others on his force did?
As if confirming Cheng Xin’s fear, a soldier spoke to her. “Dr. Cheng, please be assured that we will fight to the end.”
Another soldier spoke up. “We are not fighting for you, for Mr. Wade, or this city.” He pointed upwards, and fire seemed to light up his eyes. “Do you know what they’re trying to take away from here? Not the city or lightspeed ships, but the entire universe outside the Solar System! There are billions and billions of new worlds out there, but they won’t let us go; they want to lock us and our descendants in this prison, a prison fifty astronomical units in radius called the Solar System. We are fighting for freedom, for a chance to live as free men in the universe. Our cause is the same as every ancient struggle for freedom. We will fight to the very last. I speak for everyone in the self-defense force.”
The other soldiers nodded at Cheng Xin, their eyes grim and cold.
In the years to come, Cheng Xin would recall the soldier’s words countless times. But at this moment, they did not move her. She felt the world going dark, and she was mired in terror. She felt as though she was again standing in front of the UN headquarters, holding that baby from more than 130 years ago. She felt the baby in her arms was facing a flock of hungry wolves, and she had to protect the child at all costs.
“Will you keep your promise?” she asked Wade.
Wade nodded. “Of course. Why else would I ask you to come here?”
“Then stop all preparation for war and cease all resistance. Turn over all antimatter bullets to the Federation Government. Order those agents you’ve sent to the other cities to do the same immediately!”
The soldiers gazed at Cheng Xin, as if trying to burn her to a crisp with their eyes. The power differential between the two sides was overwhelming. She was faced with a cold machine of war. Every man carried more than a hundred hydrogen bombs, and, led by a strong, mad leader, they formed a powerful black wheel capable of crushing all resistance. She was nothing more than a blade of grass in front of this giant wheel, not able to even slow down its progress. But she had to do what she could.
However, things did not develop as she expected. The gazes of the soldiers moved away from her one by one, turning to Wade. The suffocating pressure seemed to let up gradually, but she still had trouble breathing. Wade continued to look at the curvature propulsion platform under the glass dome holding up Cheng Xin’s hair as though gazing at a sacred altar. Cheng Xin could imagine that Wade had once gathered his warriors around this altar to prophesy war.
“Why don’t you think about it some more?” Wade said.
“There’s no need.” Cheng Xin’s voice was like iron. “I have made my final decision. Cease all resistance, and turn over all antimatter in Halo City.”
Wade lifted his head and looked at Cheng Xin with rarely seen helplessness and pleading. He spoke slowly. “If we lose our human nature, we lose much, but if we lose our bestial nature, we lose everything.”
“I choose human nature,” Cheng Xin said, looking around at everyone. “I believe you all will, as well.”
Bi Yunfeng was about to speak, but Wade stopped him. His eyes dimmed. Something had gone out in them, extinguished forever. The weight of years abruptly crushed him, and he appeared exhausted. He supported himself on the metal platform with his one hand a
nd slowly sat down on a chair someone else brought over. Then he lifted his hand and pointed to the platform in front of him, keeping his eyes down. “Disarm. Leave all your ammunition here.”
No one moved at first. But Cheng Xin felt something soften. That dark force was dissipating. The soldiers looked away from Wade and no longer focused on a single point. Finally, someone walked over and placed two bandoliers on the platform. Though his movements were gentle, the metallic sound made by the cartridges scraping against the platform caused Cheng Xin to shudder. The bandoliers lay still on the platform like two gold-colored snakes. A second man walked over and deposited his bandoliers, then more. The platform was soon covered by a golden pile. After all the cartridges had been collected, the metallic noises stopped, and everything became quiet again.
“Order all of our agents in the Bunker World to disarm and surrender to the Federation Government,” Wade said. “The Halo City government will collaborate with the fleet to turn over the city. Do not take any drastic action.”
“All right,” someone answered. Deprived of their bandoliers, these men dressed in black space suits made the place even dimmer.
Wade gestured for the self-defense force to leave. They departed noiselessly, and the hall brightened as though a dark cloud had dissipated. Wade struggled to stand, walked around the pile of antimatter cartridges, and slowly opened the glass dome. He blew at the curvature propulsion platform and Cheng Xin’s hair disappeared. He closed the dome, turned to Cheng Xin, and smiled. “You see, I’ve kept my promise, little girl.”
After the Halo City Incident, the Federation Government did not immediately disclose the existence of antimatter weapons. The international community thought the event concluded as they had expected, and there wasn’t much reaction. As the creator of the circumsolar particle accelerator, the Halo Group enjoyed great prestige internationally, and public opinion was mostly forgiving of them, suggesting that there was no reason to pursue anyone legally, and Halo City should be allowed to self-govern again as soon as possible. As long as the Halo Group promised to never again engage in any research and development of curvature propulsion and submitted to Federation monitoring, it should be allowed to go on with its business.