According to the laws of the universe's higher civilization, planets cannot reveal the coordinates of their own planets, otherwise they will be violated by advanced civilizations, many scientists are opposed to us sending coordinates to extraterrestrial galaxies, such as the well-known scientist Hawking, Hawking is very opposed to the earth sending signals outward, because our knowledge is too limited we can't imagine what the consequences will be. Although the Trisolaran already has an advanced civilization, and their scientific level is much higher than that of our earth, they are still afraid that their coordinates will be leaked, because they also know that there is a higher civilization that will wipe them out in an instant, so our earth is constantly receiving extraterrestrial information and sending earth coordinates, which belongs to the fearless who do not know?There is still another scientific role.
Radio astronomy has developed rapidly in recent decades. Prompting people to search for unimaginable and distant extraterrestrial civilizations, and in order to communicate with "them", radio telescopes have been used like never before. Shkgevsky, a well-known astrophysicist in the former Soviet Union, believes that "intergalactic radio communication has an important feature that is significantly different from that of interstellar radio communication, that is, when intergalactic radio communication is carried out, the signal can be sent to billions of stars at once." Therefore, if among these stars, even if there is a highly developed civilization around even one star, this signal will be found. In fact, there may be many such civilized societies in the galaxy being explored.
On April 3, 1928, Stormma, a Norwegian professor working in the laboratory of Philip in the Netherlands, inadvertently received a strange set of radio signals, which appeared every 3 seconds, very regular, and Thoma reported to the director of the station. The station director was extremely interested in this and thought that the signal could be from an extraterrestrial star. So, they "called back" each other, they sent a set of Morse code signals every 20 seconds, and there was no response for 15 consecutive days, but on the 16th day, they received that strange signal that appeared every 3 seconds, as if someone was trying to contact the earthlings. Pleasantly surprised, Thoma arranged another launch test in October of the same year, only to receive the same fantastic signal. The news of this wonderful signal caused a sensation in the press, and many radio stations followed it closely. In the United States, it was reported that 10 such signals were received between February and April 1929A French scientific research ship inadvertently received the same signal on May 9, 1929. Unfortunately, no one has been able to decipher what exactly is contained in this strange set of signals. If this signal is from an extraterrestrial planet, then it can be proved that we are at the same level of galaxy as the planet sending the signal, and even the science and technology will be very similar, and the communication between them will still use radio technology, and even the frequency is at the same level. Unfortunately, different planets are different, and even if there are signals, we still don't know what they mean.
In 1972, the young Scottish astronomer Loren stumbled upon the precious records left by Stoma, he was immediately attracted to these signals, and used the logical thinking of modern science to study them, and after many sleepless nights, Loren announced that he had deciphered the meaning of the signal, which read: A spaceship from the planet Pastoral is flying around the solar system, but how to prove the authenticity of Loren's decipherment?I also doubt this, if the spacecraft is used for inter-universe travel, there are at least two points that can prove that the radio is not sent by them, the first spacecraft can fly galaxies must exceed the speed of light, Einstein's theory of relativity mentions that when an object reaches the speed of light, time is stationary, that is to say, when the spacecraft reaches the speed of light, the earth's time should be stationary, how can it receive a signal after 15 days, this is unreasonable, and second, since it can be interstellar, the use of radio technology to send signals is very backward and unreasonable。
In fact, the earliest research on receiving extraterrestrial signals was in the 60s of the 20th century, organized by the American radio astronomer Drake, and officially implemented, named "Ozma Project". This is a plan to passively listen to the voices of extraterrestrial civilizations, and the meaning of this plan is "to find distant extraterrestrial civilizations", with the purpose of searching for calls from aliens. The observatory uses a radio telescope with an aperture of 26 meters, which selects a wavelength of 21 centimeters to receive external signals. Why make such a choice?We know that any radio wave can only be emitted at a certain wavelength, in fact, there are infinitely many wavelengths of radio signals, how do we know which wavelength aliens use?Scientists believe that the most abundant element in the universe is hydrogen, so any intelligent living being will study hydrogen thoroughly. The wavelength of 21 centimeters is the wavelength of the microwaves emitted by hydrogen atoms, and they thought that 21 centimeters should be the most used wave rate by other cosmic creatures, of course, this is our own imagination. Drake first sent the solar system star Cetus, which is 119 light years, which is not too far away, turned out to be nothing. After that, they aimed the antenna at another 10 from EarthThe 7-light-year constellation, which initially received a radio signal with 8 pulses per second, reappeared 10 days later, and after analysis it was not the expected alien signal.
1972 In 1975, the second phase of the "Ozma Project" was carried out, in which scientists observed more than 650 planets near the Earth. Hopefully, outside of the natural radio noise of the universe, you can hear a signal like this: "You are not alone, please come to the Galactic Club." "The science of power, which comes from whimsy, only dare to think will break through the barriers of the world, and scientists believe that if these coded signals are received, it may be in numerical form, or it may be the atomic weight of some element, or any other signal that can be identified as a planned creation by aliens. In this regard, we are looking for a needle in a haystack to probe the entire sky, and even a powerful telescope like Arecibo has to point in 20 million directions. "Scientists have only listened to a few thousand planets so far, and most of them are near Earth, and the frequency they use is limited.
In 1985, under the leadership of astrophysicist Paul Horowitz of Harvard University in the United States, a new program to explore aliens was started - "space multi-channel analysis", which planned to detect extraterrestrial civilizations through more than 8 million different frequencies and high-intensity automation. They shared the following understandings: first, that, as in the case of humans, life is likely to occur in an extraterrestrial "solar system", and therefore the goal of exploration should be on a planet similar to the sun;Second, the best frequency range that radio telescopes can "hear" is between 1,000 and 10,000 MHz, when the noise in the band is lowest, so aliens who want to establish contact with the outside world may choose this band, known as the "microwave window", for interstellar dialogueThird, if we want to establish contact with other planets, we should use electromagnetic waves (such as radio waves) because they travel at the speed of light. Unfortunately, all of the above efforts have been fruitless, and no signals have been received that could confirm that they are from aliens.