After leaving the earth, human beings have been searching for traces of the existence of alien civilization through various methods, but more than half a century has passed, not to mention alien civilization, even the simplest primitive life has not found any. Are human beings lonely in the universe?
In fact, scientists have no doubt about the existence of extraterrestrial civilization. If you know that there are at least 100 billion star systems in just a small galaxy, even if civilizations are born with a small probability, the number of civilizations in the galaxy is very considerable. of.
If a large number of extraterrestrial civilizations exist in the universe, why can’t human beings find one? In fact, the main reason is that the universe is too big. Although there are many alien civilizations, the distance between them may be very large in the entire vast universe, ranging from a few light-years to hundreds of thousands. More than 10,000 light years.
The interstellar distance that cannot be crossed naturally hinders the direct contact and communication between civilizations. If this is the case, does it mean that humans will never find alien civilizations? Of course not. Although we can’t really go to the galaxy where the alien civilization is located for direct contact and communication, there is another way to communicate between cosmic civilizations, that is, wireless signals.
Every intelligent civilization that embarks on the path of technological development cannot do without the development of wireless communication technology, and the stronger the civilization, the stronger the wireless communication technology will naturally be. The propagation speed of wireless signals can reach the speed of light, and theoretically they can propagate very far distances. As long as such civilization signals can be received by us, then we will also find alien civilizations.
So can the cosmic signals sent by alien civilizations be received by us? We must know that in order to find alien civilization, human beings have repeatedly sent their own civilization signals to the depths of the universe, but these signals have not received any response.
In the opinion of scientists, being able to send out a wireless signal does not mean that it can spread to the galaxy where the alien civilization is located. It should be known that the signal is also a kind of energy, which will continue to attenuate as it spreads in the universe. In particular, photons with infrared wavelengths will be slowly absorbed by various cosmic dust and gases, resulting in a significant attenuation of propagation. They may not have reached the target galaxy yet and have been absorbed by cosmic dust.
Therefore, the traditional wireless signal propagation mode cannot truly spread in the universe on a large scale, nor can it spread very far distances. The wireless civilization signal sent to the universe by humans in the past half a century has a high probability of attenuating very weakly. , Cannot be received by alien civilization.
So what kind of signal can hope to be received by humans? Scientists thought of neutrino communication, and believed that some advanced civilizations in the universe may use neutrinos for communication. The nature of neutrinos is similar to gravitational waves. Its penetrability is very strong, and there is almost no attenuation in any direction of emission, and it can penetrate the ubiquitous interstellar medium with very little loss, better Spread in the universe.
According to scientists’ simulation calculations, the propagation distance of neutrinos can almost cover the current observable universe of mankind, which is 93 billion light-years. In other words, even if a neutrino communication signal is sent from a high-level direction to the earth tens of billions of light years away, we have hope to receive it.
So does this kind of neutrino communication really exist? According to the current theoretical research, as long as the technological strength develops to a very high stage, this kind of communication method beyond our cognition can still be achieved, and it does not violate the physical laws we currently recognize.
Of course, neutrino communication is not an ordinary interstellar communication method. Its launch is very difficult and requires the use of gravitational lensing. The gravitational lensing effect is believed to be known to many friends. It refers to a condensing effect in which massive celestial bodies distort the nearby space and bend the light.
In the vast universe, there are only two kinds of celestial bodies that can be called mass overlords: neutron stars and black holes. Their origins all come from massive stars. When the star reaches its end, a supernova explosion will form a neutron star or a black hole.
These two types of celestial bodies have very high masses and very high densities, so the space around them is also very distorted, which will produce obvious gravitational lensing effects. Alien civilizations place neutrino launchers near neutron stars or black holes, and the released neutrinos can be gathered into a powerful beam of energy with the help of the abnormally distorted space around them, and advance toward the depths of the universe.
With the help of the powerful gravitational lensing effect formed around massive celestial bodies, the neutrino signal of alien civilization can penetrate into the distant cosmic starry sky with super powerful energy waves. This powerful energy wave reminds us of fast radio bursts. This is the strongest energy pulse signal we have detected in the universe.
What exactly is a rapid firestorm? At present, the scientific community has not formed a unified answer. Some scientists believe that this is a kind of electric wave emitted by the super natural energy of the universe, and some scientists believe that this may be a powerful wireless signal issued by advanced civilization. No matter what the truth is? But the propagation distance and energy intensity of fast radio bursts are indeed the most powerful we have found so far. It can spread to the earth from tens of billions of light years away.
The more powerful the civilization, the more powerful the wireless communication technology they use, especially the interstellar communication. Naturally, ordinary communication methods will not work. With the wireless communication technology currently mastered by human beings, it cannot meet the needs of interstellar communication. Neutrino communication is undoubtedly a better alternative. Maybe we will have neutrino communication technology when human scientific and technological strength is further improved.
If an alien civilization uses neutrino communication, it will also spread to the solar system one day and be received by us. At that time, we can prove the existence of an alien civilization, and based on this signal, we will also know where the alien civilization is. The place.
Through these understandings, we can also think that there may be some technological creations around neutron stars or black holes, especially if there is a supermassive black hole in the center of the Milky Way galaxy. Will there be a gathering place for advanced civilizations? If it is said that a powerful wireless neutrino signal is launched into the depths of the universe, where the most advantageous, it must be the center of the Milky Way.
With the help of this massive black hole in the center of the Milky Way, a stronger gravitational lensing support can be obtained, so that civilization signals can be transmitted to the distant depths of the universe and the existence of intelligent civilization in the universe can be detected. Therefore, some scientists have speculated that there may be many powerful galactic civilizations gathered in the center of the galaxy. Perhaps when a civilization develops to the interstellar stage, it will move to the galactic center and use black holes to conduct various experiments.