My name is Yan Shunlu, and one moment I was listening to Goliath talk about ancient civilizations, and the next moment I heard Goliath accuse us of doing stupid things?

"Where do you start with that?" I asked, of course, with some resentment, although I don't know what he was referring to, but I always felt that our modern civilization, although there was a gap with them, was not as unbearable as he said.

"Our plan is to hide, although their goal is in our direction, there are still many planets on this line, and they can't find us for a while, and there is a great chance to pass by, and there is a high probability of not being discovered. Of course, a large part of this is our luck mentality. And in fact it seems to have worked, as in our 50th year at the bottom of the sea, we tentatively monitored them and found that they had slowed down and that there seemed to be some slight changes in their path. In the time that followed, as we watched, they seemed to change direction and headed for another galaxy. Goliath said, at the same time, with a wave of his hand, an image appeared in the sky, and in order to make it easier for us to see more clearly, he also made a mark, drawing a line from the alien spacecraft to our solar system, marking the time more than 20,000 years ago, and the other 5,000 years ago again, the angle has changed recently, and it flew away at an angle of 15 degrees to us. There will be a marker every next thousand years, and the deviation will be larger and larger.

"And then there's the situation in recent years...... "Goliath didn't say more, and showed us directly, the spacecraft formation had obviously adjusted its angle and was heading towards the solar system. The distance is also marked, 5 light years.

"What the hell did we do?"

Goliath didn't answer, but there was an indescribable mixture of emotions in her eyes that I couldn't read all of them.

There was a brief silence, but Goliath gave us the answer. A few metal plates appeared silently in the air. Many of you here have already seen what it is, and I can see that although I don't know much about astronomy, this is a big event, which has been reported in many media, and the latest news shows that it has flown out of the solar system and into the deeper part of the universe, which is the business card of the earth.

"We weren't paying attention to you at the time, and by the time we knew you had launched the Earth Card, it was too late." Goliath sighed faintly.

The Earth Business Card was carried by NASA's Pioneer 10 and Pioneer 11 vehicles launched in 1972 and 1973, and later launched Voyager 1 and Voyager 2 in 1977, both of which carried Earth Business Cards.

At that time, the purpose of the launch was so that one day, extraterrestrial creatures would know that there was once a planet in the universe called the earth, and that there was once a human civilization on it. As U.S. President Jimmy Carter's greeting reads: "This is a gift from a small, far-flung world." It contains our voices, our science, our images, our music, our thoughts and feelings. We are trying to live our time and enter your time. ”

Because the universe is so big, the closest star to us is α Centauri, which is more than 400 million light-years away from us, and it was already 40,000 years later when Voyager arrived there, and now scientists generally expect that human beings will have died out long ago at that time, so leaving the earth's business card will be the best testimony of the existence of human civilization.

In order to preserve the earth's business card for a longer period of time without being affected by cosmic radiation, it is carefully processed and said to be able to keep it undamaged for one billion years.

The content recorded above is even more comprehensive, with information about the location of the Earth in the universe and the time when the probe was built and launched. The position of the Sun is expressed in terms of its relative position to the 14 pulsars. As the "clock of the universe", pulsars rotate at a constant rate over a long period of time. There are not many pulsars in the Milky Way, and the precise period of pulsars is described in binary codes in the "business card", according to which extraterrestrial civilizations with advanced astronomy can easily determine the location of the solar system. There are also basic information about human beings, the chemical composition of DNA, the way humans reproduce, the evolution of life on Earth, basic mathematical knowledge, basic units of mass, length and time, descriptions of the composition of the Earth's atmosphere, daily information about human beings, and our scientific and technological achievements, nuclear energy, which is a scientific and technological display and a certain threat.

The first part of the first part is 115 photographs and charts recorded in image encoding, introducing the overview of the solar system and its position in the Milky Way, the appearance of the earth, the development of human science and technology, and social conditions, including photos of the Great Wall of China and pictures of Chinese family banquets; The second part is greetings spoken in 60 languages of the world, including Mandarin, Cantonese, Xiamen and Hakka in China; The third part is to introduce various natural phenomena and development history on the earth with sound, including the sound of wind, rain, thunder, the sound of various insects, birds and beasts chirping and roaring, as well as the croaking and crying of babies landing on the ground and the huge rumble of rocket launches; The fourth part is a music program, with famous songs by Beethoven and Bach, as well as folk music from various countries, including the ancient Chinese music "Flowing Water". The set of records comes in a sealed aluminium box with a high-purity uranium-238 piece on the sleeve. Since it is known to have a half-life of about 4.17 billion years for its decay into plutonium-239, the alien life that captured the record could deduce the launch date of the probe.

This series of records completely presents our current level, and I am afraid that aliens will not understand, and it is expressed in the most understandable way, as long as the life with the same intelligence can understand the above content at a glance.

"Your record on it is too detailed, and you have marked the location of the Earth in the universe, which is undoubtedly a map for them to go to the Earth." Goliath said hatefully, almost squeezing out between his teeth.

Of course, my translation only meant it, but the tone and look on his face when he said it already showed his emotion.

At that time, we just thought that we had thrown out a cosmic drifting bottle, and that it would not be discovered by other interstellar civilizations until humans disappeared from the earth, but we didn't expect it to become a guiding light by mistake.

"But they haven't necessarily discovered these Earth business cards, they have already flown out of the solar system in time, and they should have just flown out this year or so. Aliens are 500 million light-years away. Some people questioned it unconvinced.

"The reality is that one of the two Voyagers has already flown out of the solar system – Voyager 1. And 2 has already surpassed the speed of 1, but now it is still at the edge of the solar system, do you know why? Goliath glanced at everyone.

Among the astronomers here are some of the news, and of course they know some of the news, "According to the analysis of radio tracking data transmitted by Pioneer 10 and 11, when the probe was at a distance of 20 to 70 astronomical units from the Sun, its signal had some slightly anomalous Doppler frequency drift. This drift causes the detector to continuously decelerate with an acceleration of (8.74 ± 1.33) × 10^−10 m/s^2. In other words, it was as if an outside force was forcing the Pioneer to slow down. Voyager 2 is currently orbiting to the edge of the solar system and is sending some strange, hard-to-decipher signals that even space agency scientists can't do anything about. ”

"Very well, so have you ever thought that those strange signals were sent by aliens?" Goliath stared at the experts and said, "They've discovered these Earth business cards, and in a way we don't know about, they've sent some signals back to Earth through Number 2 in the process." The Pioneer may have been sent out as well, but it has long since lost contact with Earth for design reasons. ”

"This series shows that the Earth's business card has been noticed by the aliens, so they will turn around and come to Earth!"