On the thirty-eighth day after the end of deterrence, the Ringier-Fitzroy observation station at the outer rim of the asteroid belt discovered 415 new trails in the interstellar dust cloud near the Trisolaran star system. Apparently, Trisolaris had sent a second fleet toward the Solar System.

This second fleet had left Trisolaris five years ago, and passed through the dust cloud four years ago. This had been a huge risk on Trisolaris's part -- if they couldn't destroy humanity's dark forest deterrence system within five years, the discovery of this fleet might have led to the activation of the deterrence broadcast. This meant that as long ago as five years, Trisolaris already had sensed the shifting mood toward dark forest deterrence among humanity and correctly predicted the kind of second Swordholder that would be elected.

The end of deterrence once again cast the future of humankind into darkness, but, just like in the first crisis over two centuries earlier, people did not connect this darkness with their individual fates. Based on analysis of the trails, the Second Trisolaran Fleet's velocity wasn't so different from that of the First Trisolaran Fleet. Even if they could accelerate more, the fleet wouldn't arrive at the Solar System for at least two or three centuries. Everyone alive would be able to live out the remainder of their lives in peace. After the lessons taught by the Great Ravine, modern men and women would never again sacrifice the present for the future.

History seemed to have been reset; a new cycle had begun.

Three days after the Second Trisolaran Fleet left the interstellar cloud, the observation system detected 415 trails in the second interstellar cloud. These trails couldn't belong to a different fleet. The First Trisolaran Fleet had taken five years to go from the first dust cloud to the second, while the Second Trisolaran Fleet had taken only six days.

The Trisolarans had achieved lightspeed.

But this time, humanity wasn't so fortunate.

Timing wise, it appeared that the fleet had entered lightspeed as soon as it exited the first dust cloud; there didn't appear to be a stage during which it accelerated.

Analysis of the trails in the second interstellar dust cloud confirmed that they continued to extend through the cloud at lightspeed. At such high velocities, the trails left by the ships' impacts became particularly prominent.

If that was true, then the Second Trisolaran Fleet should have already or almost reached the Solar System. Using midsized telescopes, it was possible to see a patch of 415 bright lights about six thousand AU from the Earth. These were the lights generated by deceleration. Apparently the ships' propulsion systems were conventional. The fleet's velocity was now only 15 percent of the speed of light. This was evidently the fastest speed that still permitted safe deceleration before arriving at the Solar System. Based on the observed velocity and deceleration, the Second Trisolaran Fleet would arrive at the edge of the Solar System in one year.

This was a bit puzzling. It appeared as if the Trisolar ships were capable of entering and dropping out of lightspeed within an extremely short period of time, but they chose not to do so too close to the Trisolaran star system or the Solar System. After the fleet had left Trisolaris, the ships accelerated under conventional power for an entire year, until they were about six thousand AU from home, before entering lightspeed. Similarly, they dropped out of lightspeed at the same distance from the Solar System and switched to conventional deceleration. This distance could be covered in a month at lightspeed, but the fleet chose to spend a year traversing it. The cruise of the Second Trisolaran Fleet would thus take two years longer than it would if the entire voyage were conducted at lightspeed.

Only one explanation for this curious decision came to mind: It was motivated by a desire not to harm either solar system during the process of entering and dropping out of lightspeed. The safe radius appeared to be two hundred times the distance from the Sun to Neptune. This suggested that the power generated by the drives was two orders of magnitude greater than a star, which seemed unimaginable.

[Excerpt from A Past Outside of Time, Technology Explosion on Trisolaris]

First, Earth civilization had a tremendous impact on Trisolaran civilization -- on this point, at least, the Trisolarans likely didn't lie. Since the arrival of the first sophon, the massive inflow of human culture profoundly changed Trisolaris, and some human values resonated with the Trisolarans. Trisolaran society broke down the barriers to scientific progress imposed by the extreme totalitarian political system that had been adopted as a reaction to the chaotic eras, encouraged freedom of thought, and began to respect the individual. These changes might have triggered ideological transformation movements akin to the Renaissance in that distant world, leading to leaps in scientific and technological progress. This must have been a glorious period in Trisolaran history, but the specific details were unknown.

Exactly when the rate of Trisolaran technological progress had shifted from constant to explosive was a mystery. Some scholars believed that the acceleration began before the Crisis Era; others believed that the forward leap didn't happen until the Deterrence Era. There was, however, general consensus on the causes for the technology explosion.

For the first time since the end of deterrence, Sophon appeared. Still dressed in camouflage and wearing the katana on her back, she announced to the world that the Second Trisolaran Fleet would arrive in four years to complete the total conquest of the Solar System.

Trisolaran policy toward humanity had changed since the first crisis. Sophon announced that Trisolaris no longer intended to exterminate human civilization, but would create reservations for humans within the Solar System -- specifically, they would let humanity live in Australia and on one-third of the surface of Mars. This preserved the basic living space needed for human civilization.

[Post-Deterrence Era, Day 60, A Lost World]

A second possibility was only a guess: The exploratory sophon missions sent in other directions in the universe were not fruitless, as the Trisolarans claimed. Before being blinded, they might have found at least one other civilized world. If so, Trisolarans might have not only received technological knowledge from this other civilization, but also important information about the condition of the dark forest in the universe. If so, Trisolaris far surpassed the Earth in every domain of knowledge.

Five days after this historical "Reservation Proclamation," one of the five droplets cruising within the Earth's atmosphere attacked three large cities in Asia, Europe, and North America. The purpose of the attacks wasn't to destroy the cities, but to instill terror. The droplet passed straight through the giant forests of these cities, colliding with all hanging buildings that happened to be in the way. The struck buildings burned and then fell several hundred meters, like overripe fruits. Over three hundred thousand people died in the worst disaster since the Doomsday Battle.

To prepare for the Trisolaran conquest in four years, Sophon declared that humanity must immediately begin to resettle. To accomplish the so-called "defanging" of humanity, and to prevent the reappearance of dark forest deterrence or similar threats in the future, humanity must be completely disarmed and resettle "naked." No heavy equipment or facilities would be permitted in the reservations, and the resettlement must be completed within one year.

Human habitats on Mars and in space could accommodate about three million individuals at most; thus, the main destination for resettlement was Australia.

But most people still held on to the illusion that they would have at least a generation of tranquil life. After Sophon's speech, no country responded, and no one actually emigrated.

As a matter of fact, humans had been working toward overcoming this disadvantage. Humans understood early on that only strong-interaction materials (SIM) could be used to defend against droplets. Before the termination of deterrence, research facilities on Earth and in the fleet could already produce small quantities of such material in laboratories, though large-scale manufacturing and utilization would not be possible for years. If humanity had had another ten years, production of large amounts of SIM would have been a reality. Although the propulsion systems of the droplets would still have been far beyond human capabilities, at least conventional missiles could have been made out of SIM to destroy the droplets by sheer numerical advantage. Alternatively, SIM could have been used to construct defensive screens. Even if the droplets had dared to attack these shields, they would have become one-time-use shells.

People finally understood that, to the droplets, the human world was as fragile as eggs under a poised rock. Cities and large-scale facilities were defenseless. If the Trisolarans wanted, they could lay waste to every city, until the surface of the Earth was one large ruin.

Thus began the Great Resettlement of all of humanity to Australia.

But all of this depended on the successful accomplishment of the initial resettlement to Australia. If the relocation effort did not commence immediately, the droplets would continue to attack the cities. After the expiration of the one-year period, any humans found outside the reservations would be exterminated as invaders on Trisolaran territory. Of course, if humans left the cities and scattered across the continents, the five droplets alone would not be enough to locate and kill every single individual. But the Second Trisolaran Fleet arriving in four years would no doubt be able to.

Alas, none of these visions would ever come true now.

Sophon made another speech, in which she explained that Trisolaris had changed its policy of extermination of humanity out of love and respect for human civilization. It was inevitable that resettlement of humanity to Australia would cause them to suffer somewhat for a period of time, but it would last only three to four years. After the arrival of the Trisolaran Fleet, the conquerors were capable of helping the four billion people in Australia live comfortably. Also, the conquerors would assist humanity in constructing additional habitats on Mars and in space. Five years after the arrival of the Trisolaran Fleet, humanity could begin to migrate in large numbers to Mars and space, a process projected to take fifteen years. By then, humanity would possess adequate living space, and the two civilizations would begin a life of peaceful coexistence.

"The glorious and resplendent civilization of Earth earned humanity this one chance at survival," said Sophon. "Please treasure it."