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The listener knew that at the scale of the universe, due to the lack of a sufficiently long measurement baseline, it was impossible to determine the distance of a source of low-frequency radio transmission from space, only the direction. The source could be high-powered but far away, or low-powered but close by. In that direction were billions of stars, each shining against a sea of other stars at different distances. Without knowing how far away the source was, it was impossible to ascertain its exact coordinates.

Distance, the key was distance.

Indeed, there was an easy way to ascertain the distance of the transmission source. Just respond to the message, and if the other party replies quickly to the response, the Trisolarans could determine the distance based on the round-trip time and the speed of light. Or maybe they would take a really long time to reply and cause the Trisolarans to be unable to determine how long the message was en route.

But the question was: Would the other party reply? Since this source had actively sent out a call into the universe, it was very likely that they would reply after getting a response from Trisolaris. And the listener was sure that the Trisolaran government had already given the order to send a message to that distant world to lure them to respond. Maybe the message had already been sent, but maybe not. If the latter was true, then the listener had a singular chance to make his own humble life glow.

The listener dashed in front of the operations screen and composed a short, simple message on the computer. He directed the computer to translate the message into the same language as the message received from the Earth. Then, he pointed the listening post’s antenna in the direction the message from Earth had come from.

The Transmit button was a red rectangle. The listener’s fingers hovered above it.

The fate of Trisolaran civilization was now tied to these slender fingers.

Without hesitation, the listener pressed the button. A high-powered radio wave carried that short message, a message that could save another civilization, into the darkness of space.

Do not answer! Do not answer!! Do not answer!!!

*   *   *

We don’t know what the official residence of the princeps of Trisolaris looked like, but we can be sure that thick walls separated him from the outside so as to protect him against the extreme weather. The pyramid from the Three Body game was one guess about what it could look like. That they built the residence deep underground is another.

Five Trisolaran hours earlier, the princeps received the report of the extra-Trisolaran communication. Two Trisolaran hours earlier, he received another report: Listening Post 1379 had sent out a warning message in the direction of the transmission.

The first report did not cause him to leap up in ecstasy, and the second report did not cause him to sink into depression. He wasn’t even angry or resentful. All of these emotions—and other emotions, such as fear, sorrow, happiness, and appreciation of beauty—were things that the Trisolaran civilization strove to avoid and eliminate. Such emotions caused the individual and society to be weak spiritually and did not help with survival in the harsh environment of this world. The mental states that Trisolarans needed were calmness and numbness. The history of the past two hundred-some cycles of civilization proved that civilizations that relied on these two states as their spiritual core were the most capable of survival.

“Why did you do this?” the princeps asked the listener from Post 1379.

“So that my life isn’t wasted,” the listener answered calmly.

“The warning you sent out may have cost Trisolaran civilization the chance at survival.”

“But it gave Earth civilization such a chance. Princeps, Trisolaran civilization’s desire to possess living space is like the desire of a man who has been starving for a long time for food, and it is similarly boundless. We cannot share the Earth with the people of that world. We could only destroy Earth civilization and completely take over that solar system.… Am I right?”

“Yes. But there is another reason for destroying Earth civilization. They’re also a warlike race. Very dangerous. If we try to coexist with them on the same planet, they will shortly learn our technology. Continuing in that state would allow neither civilization to thrive. Let me ask you: You wish to be the savior of the Earth, but do you not feel any sense of responsibility for your own race?”

“I am tired of Trisolaris. We have nothing in our lives and spirit except the fight for survival.”

“What’s wrong with that?”