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Six years had passed since their return from Australia, but the trials of the Great Resettlement and the intervening years seemed to have left no mark on AA. She was like a fresh, resilient plant that allowed the hardships of the past to roll off her smooth leaves. During these six years, Cheng Xin's company had developed rapidly under AA's management and become one of the prominent players in near-orbit space construction. But AA didn't look like a powerful CEO; instead, she retained the look of a lively, fun young woman. Of course, that was not unusual in this age.

艾 AA told Cheng Xin that her eyes were even prettier and brighter than before, and perhaps she wasn't lying. Cheng Xin had been mildly myopic before, but now she saw everything with extreme clarity, as though the world had been given a fresh coat of paint.

The six years hadn't touched Cheng Xin either -- she had spent them in hibernation. After their return from Australia, her blindness had been examined and diagnosed. It had started out as psychosomatic -- the result of extreme emotional distress -- but later developed into a detached retina followed by necrosis. The recommended treatment was to produce cloned retinas suitable for transplant out of stem cells developed from her DNA, but the process would take five years. Cheng Xin spending five years in complete darkness in her extremely depressed state would have led to total breakdown, and so the doctors allowed her to hibernate.

Retaliation against the Earth Security Force followed. Objectively speaking, the good done by the ESF far exceeded that done by the Resistance. The ESF had been able to protect the big cities and other basic infrastructure. Although they had done so for the benefit of Trisolaran civilization, their efforts allowed the world to recover economically after the Great Resettlement with minimal delay. During the post-resettlement evacuation of Australia, Australia almost plunged into total chaos multiple times due to the lack of food and electricity, and it was the ESF that maintained order and kept supplies flowing, making it possible to complete the evacuation in four months. During that extraordinary, tumultuous time, if this well-equipped armed force had not been present, the results would have been unimaginably tragic. But none of these accomplishments were taken into account by the tribunals sitting in judgment over them. All ESF members were tried, and half were convicted of crimes against humanity. During the Great Resettlement, many nations revived capital punishment, and this persisted even after the return from Australia. During these five years, many former ESF members were executed, even though many among the cheering crowd had also submitted applications to the ESF.

The world had indeed been refreshed. After receiving news of the gravitational wave universal broadcast, the whole world celebrated. Blue Space and Gravity became salvation ships out of myths, and the two crews became superheroes worshipped by all. The charge that Blue Space had committed suspected murder during the dark battles was withdrawn, and replaced with the affirmation that it had acted in justified self-defense after being attacked. Simultaneously, members of the Earth Resistance Movement who had persisted in a hopeless struggle during the Great Resettlement were also hailed as heroes. When those resistance fighters dressed in rags appeared before the public, everyone felt hot tears in their eyes. Blue Space, Gravity, and the Resistance became symbols of the grandness of the human spirit, and countless worshippers seemed to think that they themselves had also always possessed such spirit.

This tranquility was premised on this fact: When Luo Ji had conducted his dark forest experiment, 157 years had passed between when he first broadcast the coordinates of 187J3X1 to the universe and when that star was destroyed. That was equivalent to the life span of a modern human. To be sure, birthrates declined to their lowest levels in recorded history because no one wanted to bring a child into a world doomed to die. But most believed that they would be able to live out the rest of their days in peace and happiness.

The gravitational wave broadcast was far stronger than the Sun-amplified radio broadcast employed by Luo Ji, but humanity soon found refuge in a new way to comfort themselves: questioning the validity of dark forest theory itself.

Eventually, peace returned, and people began to rebuild their lives. As the cities and industrial infrastructure remained intact, recovery was rapid. Within two years, the cities had eliminated the scars from the chaotic times and recovered their pre-resettlement prosperity. Everyone resolved to enjoy life.

The first piece of evidence: Luo Ji's dark forest experiment that led to the destruction of 187J3X1 and its planetary system. The supposition that the system had been destroyed by some extraterrestrial intelligence had always been controversial. The astronomical community had always voiced the loudest objections. There were two main views: One camp believed that the object observed striking the star at lightspeed was insufficient to destroy the star. The death of 187J3X1 was thus likely the result of a natural supernova. Since there was incomplete predestruction data for this star, it was impossible to say definitively whether the star possessed the requisite conditions for going supernova. Considering the long time that elapsed between Luo Ji's broadcast and the star's explosion, there was a high probability that the event was indeed natural. A second camp conceded that a lightspeed object did kill the star, but the "photoid" might very well be a natural phenomenon in the galaxy. Although to date no second photoid had been detected, there had been observations of massive objects being accelerated to extremely high speeds by naturally occurring forces. For instance, a supermassive black hole near the center of the galaxy was perfectly capable of accelerating some small object to near the speed of light. In fact, the center of the galaxy might produce a large number of such projectiles, but due to their small size, they were rarely seen.

For sixty-some years -- the entirety of the Deterrence Era -- dark forest theory formed the backdrop to human history. But scholars had always questioned it, and until the start of the Broadcast Era, there had never been any scientific proof for its validity. The existing few pieces of evidence all lacked rigorous scientific foundation.

[Excerpt from A Past Outside of Time, Delusions of Cosmic Persecution: The Last Attempt to Invalidate Dark Forest Theory]

The second piece of evidence: the terror Trisolaris showed for dark forest deterrence. This was, to date, the most convincing proof for dark forest theory, but humanity knew nothing of the Trisolarans' own process of derivation and the evidence they relied on; so, scientifically speaking, it was insufficient to constitute direct proof. It was possible that Trisolaris submitted to a state of deterrence balance with humanity for some other unknown reason, and finally gave up the conquest of the Solar System. Many hypotheses were proposed to explain this unknown reason, and although none were absolutely convincing, none could be conclusively disproven, either. Some scholars proposed a new theory of "delusions of cosmic persecution," which argued that the Trisolarans also had no proof of the validity of dark forest theory. However, due to the extremely harsh environment they had evolved in, the Trisolarans suffered a mass persecution complex against cosmic society. This persecution delusion was similar to Medieval religions on the Earth, and was merely a faith held by a majority of Trisolarans.

The third piece of evidence: the confirmation of dark forest theory given by the four-dimensional Ring. Clearly, the Ring had obtained the words "dark forest" from the Rosetta System, specifically the section discussing human history. This phrase appeared often in historical records dating from the Deterrence Era, and it was not surprising that the Ring would use it. However, in the dialogue between the Ring and the exploration team, the section where the concept was invoked was very brief and its exact meaning ambiguous. It was not enough to conclude that the Ring really understood the meaning of the words it used.

Since the Deterrence Era, the study of dark forest theory had developed into its own subject. Other than theoretical research, scholars also conducted large numbers of astronomical observations and built numerous mathematical models. But for most scholars, the theory remained a hypothesis that could be neither confirmed nor disproven. Dark forest theory's true believers were the politicians and the public, and members of the public mostly chose to believe or disbelieve based on their own situations. After the commencement of the Broadcast Era, more and more people leaned toward treating dark forest theory as merely a delusion of cosmic persecution.

Broadcast Era, Year 7, Cheng Xin

The election had been a complicated process -- public opinion had turned into political pressure exerted on the UN and Fleet International. The public vigorously debated who was ultimately responsible, but almost no one suggested that it was the result dictated by the herd mentality of all involved. Public opinion was relatively forgiving to Cheng Xin herself. Her positive public image provided some measure of protection, and her suffering as an ordinary person during the Great Resettlement gained her some sympathy. Most people tended to think she was also a victim.

After the dust settled, humanity turned its attention from the universal broadcast to reflecting on the end of the Deterrence Era. A veritable flood of accusations and denunciations against the Swordholder began to appear. If Cheng Xin had activated the broadcast at the start of the droplet attack, then, at a minimum, the disaster of the Great Resettlement could have been avoided. Most of the negative public opinion, however, was concentrated on the process of choosing the Swordholder.

But for Cheng Xin, life had turned into an endless torture. Although her eyes could see again, her heart remained in darkness, sunken in a sea of depression. 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. She spoke to no one, did not seek out news about the outside world, and paid no attention even to her growing company. Although AA cared about Cheng Xin, she was busy and could spend little time with Cheng Xin. Fraisse was the only one who provided the support Cheng Xin needed.

Overall, the Swordholder's decision to capitulate made history take a long detour, but didn't change its overall direction. In the end, the universal broadcast had been initiated, and so the debate over that period of history eventually subsided. Cheng Xin gradually faded from the public consciousness. After all, the most important thing was to enjoy life.

"Child, I spent the day picking up debris from the shelter-houses. I'd like to see the desert return to how it was before."

There was a two-hour time difference between Australia and China, and gradually, Cheng Xin grew used to the daily rhythms of Fraisse's life. Every time she heard the old man's voice, she imagined herself also living in that distant forest surrounded by desert, sheltered under a tranquility that kept the rest of the world at bay.

These conversations consisted of a few simple sentences: "Child, the sun is rising here."

During the dark period at the end of the Great Resettlement, Fraisse and AA had been taken out of Australia together. He lived in Shanghai for a while but didn't wait for the evacuation to complete before returning to his house near Warburton. After Australia returned to normalcy, he donated his house to the government to be used as an Aboriginal cultural museum. He, on the other hand, went into the woods and built a small tent, and really took up the primitive life of his ancestors. Though he lived in the open, his physical health seemed to improve. The only modern convenience he possessed was a mobile phone, which he used to call Cheng Xin a few times a day.

"Child, the sunset is lovely here."

"Child, it's raining. Do you remember the smell of humid air in the desert?"

He sounded anxious. "Child, go out and look up in the sky."

Just that kind of blue light could be seen outside.

Cheng Xin could already tell something unusual was happening. In her uneasy sleep, she had been gripped by a nightmare. The dream was a familiar one: A gigantic tomb stood in the middle of a plain covered by the darkness of night. A bluish glow spilled from within the tomb and illuminated the ground nearby…

She went onto the balcony and saw a blue star in the sky, brighter than all the other stars. Its fixed position distinguished it from the man-made structures orbiting in near-Earth orbit. It was a star outside the Solar System. Its brightness was still intensifying, and even overpowered the lights of the city around her, casting shadows against the ground. About two minutes later, the brightness reached a peak and was brighter even than a full moon. It was no longer possible to look at it directly, and the color of the light shifted to a harsh white, illuminating the city as though it were daytime.

One night, the telephone roused Cheng Xin from her slumber. She saw that the caller was Fraisse. It was 1:14 A. M. in China, and 3:14 in Australia. Fraisse knew that Cheng Xin suffered from severe insomnia, and without a sleep-aid machine, she could only manage two to three hours of rest a night. Unless it was an emergency, he would never be disturbing her at a time like this.

[Excerpt from A Past Outside of Time, A New Model for the Dark Forest]

Cheng Xin recognized the star. For almost three centuries, humans had looked at it more than at any other spot in the heavens.

Someone screamed in the leaf-building nearby, and there was the sound of something crashing to the floor.

The star now began to fade. From white it gradually dimmed to red, and about half an hour later, it went out.

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

Cheng Xin hadn't brought the phone with her, but the floating communication window had followed her. She could still hear Fraisse's voice, which had recovered its usual serenity and transcendence. "Child, don't be afraid. What will happen, will happen."

Trisolaris was shattered three years and ten months after the start of the Broadcast Era. No one had expected the attack to come so soon after the gravitational wave broadcast.

Since Trisolaris had always been under intense surveillance, plenty of data was captured concerning its extinction. The attack on the Trisolaran system was identical to the attack on Luo Ji's 187J3X1: A small object traveling near the speed of light struck one of the three stars in the system and destroyed it through its relativistically amplified mass. At the time, Trisolaris had just started to revolve around the star, and the stellar explosion annihilated the planet.

When it made the gravitational wave broadcast, Gravity was about three light-years from Trisolaris. Taking into account the lightspeed propagation of gravitational waves, the photoid must have been launched from a point that was even closer to Trisolaris than Gravity -- and the launch must have been practically instantaneous after receiving the coordinates. Observations confirmed this: The trail of the photoid traversing the interstellar dust cloud near Trisolaris was clearly recorded, but there were no other solar systems within this zone of space -- the only conclusion was that the photoid had been launched from a spacecraft.

The old model for dark forest theory had always assumed planetary systems around stars as the foundation. People simply assumed that attacks on systems whose coordinates had been exposed must come from other planetary systems. But once the possibility of attacks from spacecraft entered the scene, the situation became far more complex. While the locations of stars were relatively well known, humans had no information at all concerning spacecraft made by other intelligences -- save for the Trisolaran Fleet. How many extraterrestrial spaceships were there? How densely were they deployed in space? How fast did they fly? What were their headings? There were no answers to these questions.

The possible sources of dark forest attacks could no longer be predicted, and the attacks might come much faster than previously imagined. Other than the surviving stars of the Trisolaran system, the nearest star was six light-years from the Solar System. But the ghostlike alien spaceships could be, at that moment, passing next to the Sun. Death, once only a figure on the horizon, now loomed before our eyes.