Cixin Liu - Death's End

The pinnace was now next to the paper slip. After checking their space suits, they opened the pinnace’s hatch so that they were exposed to space. They fine-tuned the pinnace’s position until the paper slip hung half a meter above their heads. The tiny white plane was perfectly smooth, and through it they saw the stars behind, confirming that it really was a glowing, transparent object. The white light it emitted made the stars behind it appear a bit blurred.

They lifted themselves up in the pinnace until their eyes were lined up with the edge of the plane. Just like the camera had shown, the paper had no thickness. From the side, it completely disappeared. Vasilenko extended a hand toward the paper, but 白 Ice caught him.

“What are you doing?” 白 Ice asked severely. His eyes said the rest. Think about what happened to my teacher.

“If it really is a letter, perhaps the message won’t be released until an intelligent body makes direct contact with it.” Vasilenko brushed off 白 Ice’s hand.

Vasilenko touched the paper with his gloved hand. His hand passed through the paper and was not damaged. Vasilenko received no mental message, either. He again moved his hand through the paper and stopped, allowing the small white plane to divide his hand into two parts. Still, he felt nothing. The paper showed an outline of the cross section of the hand where the hand penetrated it: clearly, the sheet hadn’t been broken, but passed through the hand unharmed. Vasilenko pulled his hand back, and the slip hung still as before—or, more accurately, continued to move toward the Solar System at the rate of two hundred kilometers per second.

白 Ice also tried to touch the slip, then pulled his hand back. “It’s like a projection from another universe that has nothing to do with ours.”

Vasilenko had more practical concerns. “If nothing can affect it, then we have no way to bring it to the ship for further analysis.”

白 Ice laughed. “That’s a simple problem to solve. Have you forgotten the story told by Francis Bacon? ‘If the mountain will not come to Muhammad, then Muhammad must go to the mountain.’”

And so, Revelation slowly sailed toward the paper slip, made contact, and then allowed it to enter the ship. Even more slowly, it adjusted its position until the slip hung in the middle of the laboratory cabin. The only way to move the slip during study was to move the ship itself. This odd way to manipulate the research subject posed some challenges near the beginning, but luckily, Revelation was originally designed to investigate small space objects in the Kuiper Belt and possessed excellent maneuverability. The gravitational wave antenna was equipped with twelve high-precision thrusters. After the ship’s AI grew used to the necessary adjustments, the manipulation became quick and precise. If the world could not affect the slip in any way, the only solution was to let the world surround the slip and move about it.

Thus, an odd sight came to be: The slip was located in the center of Revelation, but the ship had no dynamical connection to the slip. The two simply happened to occupy the same space as both moved toward the Solar System at the same velocity.

Inside the spaceship, due to the stronger background light, the transparency of the slip became more obvious. It now no longer resembled a slip of paper, but some transparent film that only indicated its presence by the faint light it emitted. People continued to refer to it as a paper slip, however. When the ambient light was very strong, it was sometimes possible to lose sight of it, so the researchers had to dim the lights in the laboratory to see the slip better.

The first thing the researchers tried to do was to ascertain the slip’s mass. The only applicable method was to measure the gravity it generated. However, even at the highest precision level, the gravity meter showed nothing, suggesting that the slip’s mass was extremely small, perhaps even zero. Based on the latter possibility, some guessed that the object might be a photon or neutrino in macro form, but its geometric shape suggested that it was artificial.

No progress could be made on analysis of the slip because electromagnetic waves of all wavelengths passed through it without diffraction. Magnetic fields, no matter how strong, seemed to have no effect on it. The object appeared to have no internal structure.

Twenty hours later, the exploratory team still knew next to nothing about the slip. They were able to observe one thing, however: The intensity of the light and gravitational waves emitted by the slip was decreasing. This suggested that the light and gravitational waves it emitted were probably a form of evaporation. Since these two were the only indication of the existence of the slip, their disappearance would be the same as the disappearance of the slip itself.

The base informed the exploratory team that Tomorrow, a large science vessel, had left the Neptune city cluster and would meet the expedition in seven days’ time. Tomorrow possessed more advanced investigative instruments, and could study the slip in more depth.

As they became more used to the slip, the crew on Revelation became less guarded and were no longer so careful about keeping a respectful distance from it. They knew that the object did not interact with the real world and emitted no harmful radiation. They touched it casually, allowing it to pass through their bodies. Someone even let the plane pass through his eyes and brain, asking a friend to take a picture of the sight.

白 Ice was enraged when he saw this. “Stop it! This is not some joke,” he screamed. Having worked nonstop in the lab for more than twenty hours, he left the laboratory and returned to his own cabin.

白 Ice turned off the light in his cabin and tried to go to sleep. But in the darkness he felt uneasy; he imagined the paper slip would float into his cabin, glowing white, at any moment. So he turned on the light and drifted in the gentle light and memories.

One hundred and ninety-two years had passed since he said good-bye to his teacher for the last time.

It was dusk, and he and Ding Yi and he had come to the surface from the underground city and taken a car into the desert. Ding Yi liked to stroll and think in the desert, and even to hold his lectures there sometimes. His students hated the experience, but he explained his eccentric habit this way: “I like desolate places. Life is a distraction for physics.”

The weather that day was good. There was no wind and no sandstorms, and the early spring air smelled fresh. The two of them, teacher and student, lay against a dune. The desert of Northern China was bathed in the light of the setting sun. Normally, Bai Aisi thought of these rolling dunes as a woman’s body—possibly a comparison that had originated with Ding Yi himself—but now he thought of them as an exposed brain. In the golden dusk, the brain revealed its profusion of grooves and folds. He looked up at the sky. Today, the dusty air managed to let through a bit of long-missed blue, like a mind about to be enlightened.

Ding Yi said, “Aisi, I want to tell you a few things that you should not repeat to others. Even if I don’t return, don’t tell others. There’s no special reason. I just don’t want to be laughed at.”

“Professor Ding, why not wait until you’re back to tell me?”

Bai Aisi wasn’t trying to comfort Ding Yi. He was sincere. He was still drunk with the ecstasy and vision of humanity’s imminent great victory over the Trisolaran fleet, and he did not think Ding Yi’s trip to the droplet would involve much danger.

“Answer a question first, please.” Ding Yi ignored Bai Aisi’s question and pointed at the desert lit by the westering sun. “Forget about the uncertainty principle for a minute and suppose everything is determinable. If you know the initial conditions, you can calculate and derive the conditions at any later point in time. Suppose an extraterrestrial scientist were given all data about the Earth several billion years ago. Do you think it could predict the existence of this desert solely through calculation?”