The Ye Wenjie in the novel is a top student majoring in astrophysics. She encountered that special era right after graduation.

Society has given her and her father a lot of unfair treatment, and people around her have also deceived and framed her.

Her painful experience made her finally lose hope in humanity and society. Therefore, she believes that human beings can no longer solve their own problems and must either be destroyed or must rely on external forces.

So when she was working at the Red Bank Base, she came up with the idea of ??summoning advanced civilizations in the universe through radio waves, hoping that aliens would come to the earth.

In 1971, she secretly used the giant radio telescope in the base to emit radio waves to the sun, and through the amplification of the radio waves by the sun, broadcasts were broadcast to the entire universe. Ye Wenjie didn't have much hope for this matter at the time, because no one had ever received a signal from aliens, and she didn't even have a definite answer to whether there were aliens in the universe. .

Human beings have also tried to find aliens, but found nothing for decades. So people wondered if they could take the initiative to contact aliens. In the 1970s, the United States took the first action. They wanted to launch a spaceship with a business card to fly to outer space.

The business card is a piece of gold foil with the image of a man and a woman drawn on it. There is also a row of symbols depicting the positions of the sun and nine planets in the solar system. The position of the earth is also marked to indicate the spacecraft. It flew out from here.

Later, in 1977, the United States launched Voyager 1, a probe that could fly further. I brought a gold record with me, which contains 115 images and more than 90 minutes of sound information, including the natural sounds of waves, wind, birdsong, and all kinds of music on the earth. It also recorded 55 images used by people on the earth. Greetings spoken in languages.

These languages ??express the desire of humans on Earth to establish communication with extraterrestrial civilizations.

After all, the speed of the spacecraft is not fast enough, so it is better to use radio waves to launch directly. Later, the largest radio telescope in the world at the time was used to transmit radio waves to fixed points in the universe.

Of course all these attempts have yielded no results.

In the Three-Body novel, Ye Wenjie sent a signal, which happened to be received by the Trisolarans in the Trisolaran galaxy closest to the sun. It was only four light-years away, so they immediately replied to the message. Eight years later, Ye Wenjie received a reply. There should be no happier person in the universe than this reply.

Ye Wenjie wants to call aliens to save mankind, but in reality, we obviously do not go looking for aliens for this reason. So why are we looking for aliens? What are the benefits of finding alien civilizations?

The meaning of searching for aliens can be said to be as big as they are.

It is of far-reaching significance in terms of science and technology, social politics, and even philosophy.

For example, if it can only prove the existence of extraterrestrial civilizations, even without any substantial contact, it can have a huge impact on our human civilization, because in the vast universe, there are finally The existence of others.

If we have contact with aliens, if aliens are willing to cooperate with humans and impart knowledge and wisdom to us, they may really be able to help us get rid of nuclear war and environmental pollution. .

On the other hand, if a certain country or political force on earth first makes contact with aliens and forms an information monopoly, then the internal differences of earth civilization will sharply widen. big.

In this country, the economic and military impact is beyond all imagination. He may reach the sky in one step and be the only one in the world, but the consequences may be a disaster for all mankind.

But the question is, if people don’t plan to cooperate with us, what will happen?

As depicted in the movie Independence Day, this possibility exists. We knew that was a disaster too.

In the novel, the Trisolarans called by Ye Wenjie are not intended to help people on Earth, but to immigrate to Earth.

The cosmic sociology and "dark forest" theory mentioned in the novel also explain to a certain extent why we should not expose ourselves. It’s no wonder that Mr. Hawking always warned people during his lifetime not to take the initiative to contact aliens.

But there must be a civilization that steps forward first and takes this first step to truly explore the real universe. Since humans invented radio equipment, so many radio waves emitted in daily life have actually spread into the universe long ago, and the position of the earth may have been exposed long ago.

No matter what the consequences are, it is impossible for humans to resist their original desire to explore the universe. In the future, whether we can explore new forms of earth civilization through extraterrestrial civilizations, only time will probably tell us. The answer is.