How to find aliens? Three most reliable methods

1, what methods have humans thought of in order to find aliens?

1977 the United States launched the traveler program. Voyager 1 sailed for Ophiuchus, and Voyager 2 sailed for Peacock. Maybe you don't understand, why choose this year? NASA doesn't just launch probes on a random day, because Saturn, Uranus, Neptune and Pluto are all on the same side of the solar system this year.

Travelers flying over these planets can not only observe these planets, but also use gravitational slingshot effect to accelerate, saving fuel to the greatest extent, killing two birds with one stone. If 1977 is not released, the next one will be 2 153.

Now the speed of travelers has reached third cosmic velocity, and theoretically they can fly out of the solar system, but only to the heliosphere of the sun, which is the farthest place where the solar wind blows. But the solar system is not that big. The outermost layer of the solar system is covered with a dust cloud formed by comets, called Oort Cloud. It takes 40,000 years to fly to Oort Cloud.

Voyager brought gifts to alien civilization. It was a gold-plated record with the location of the solar system and the purpose of the record engraved on it. The record records the sounds of nature, greetings in 55 languages and classic music from all over the world. There is also a Chinese classical music on the gold record, which is the famous "Mountain Flowing Water". I wonder how aliens feel when they hear this magnificent concert.

There is little hope that Voyager 1 and Voyager 2 will be discovered by aliens. If the technology breaks through, it is likely that the new spacecraft will catch up with Voyager in a few decades.

Next, we continue to talk about the second way to find aliens, making phone calls.

2. How to communicate with aliens? Scientists have actually built a huge microphone.

1974 Humans made a phone call to the m 13 nebula, which is 25,000 light years away from the Earth. The "microphone" used is 305 meters in diameter and is the largest astronomical telescope ever. If the alien calls back, it will take us 25,000 years to hear it.

This is a string of information consisting of 1679 binary digits, including the shape of human beings and the information of the solar system. But I think this news is destined to be difficult to receive, because they are not aimed at the M78 nebula.

In addition to calling aliens, scientists are actually more keen to answer calls from aliens. As early as 1960, a non-profit scientific research institution in the United States set up a (Phoenix Project) to find extraterrestrial civilization. Phoenix plans to cooperate with radio telescopes in all directions around the world to search for extraterrestrial signals in all directions and analyze the regular information that may be sent by extraterrestrial civilization.

Not only professional scientists but also amateur astronomers can participate in the Phoenix Project. As long as you have a 3-5 square meter spherical observation device, you can search through SETI software. SETI headquarters will allocate a space for each member, and maybe you will receive three sentences: Don't answer! Don't answer! Don't answer!

Even if you don't have spherical observation equipment. You can also download SETI software and use your computer to help them analyze those complicated signals. 1977 American astronomer Jerry Ayman detected an obvious broadband radio signal in Ohio. This signal is not the signal of the solar system. Gradually increase and then decrease for 72 seconds. This is the first unusual signal that humans have searched for.

Ayman was very excited and wrote a "wow" next to the signal paper, which is the famous wow signal. Later, after analysis, this signal came from our neighbor Samsung Sagittarius, so the trio probably really exists. 20 16 Arecibo, once the largest radio telescope, died. This year, the China Eye of the Sky FAST telescope, which took 22 years to build, was officially put into operation. The FAST telescope also took over the task of searching for extraterrestrial civilization.

The third one is a little more complicated and can even help people with interstellar migration.

3. Where is the alien's hometown? Maybe they are in these super-earths.

As the name implies, Super Earth is a planet very similar to Earth. Many people say that the form of life is definitely not limited to carbon-based life, but also silicon-based life, gaseous life, neutron life and plasma life. But when we look for extraterrestrial life, we must first look for life forms that already exist in the universe. The fact is, you found a rare white tiger in nature. Is it more likely to find another white tiger or a green tiger? Therefore, the probability of finding life similar to human beings is the greatest.

When a rocky planet orbits a star, it periodically blocks some light from the star. By observing these phenomena through a telescope, we can know whether there are rocky planets in this star. This is the Ningri method. At present, 4 100 terrestrial planets have been discovered by this method, but the mass of these terrestrial planets should not be larger or smaller than that of the earth. Too big will attract too much gas to become a gas planet like Jupiter, and too small will not hold the atmosphere. So this 4 100 is like only 288 beautiful women who are similar to the earth. By spectral analysis of the atmospheres of these planets, we can determine whether there is liquid water in the clouds, and finally only 54 dates don't look like cantaloupes.

20 15 Kepler telescope discovered a super planet named k2- 12b. Its mass is eight times that of the earth, and it is very likely that there is liquid water. Kepler telescope observed 654.38+million stars and screened out 50 super earths. According to this probability of 0.05%, the Milky Way has1250,000 living planets and 60,000 planets with possible intelligent life. There are 2 trillion galaxies in the universe, so the universe has long been full of intelligent life. Perhaps, just like the dark forest setting in Three-body, we can't find them because they are all hidden.

And the earth civilization is just a baby civilization that has not even walked out of the novice village. Of course, more people think that in fact, we don't need to look for alien civilizations at all, because they may have come to the earth.

See you next time!