Underground civilization said

In some science fiction movies, it is said that the earth is a paradise for human evolution, but there is another civilized world ruled by evolved insects inside the earth, and eventually the underground insects start a war with humans for the right to survive on the ground. It is reported that after the US artificial satellite "Charlie 7" went to the Arctic Circle to take pictures, it was found that a hole had been opened in the Arctic zone on the negative. In addition, geophysicists generally believe that the earth weighs millions of times more than 6 trillion tons, and if the earth's interior were a entity, the weight would be more than that, thus giving rise to the "earth hole theory". Some of the oil exploration team members have found large tunnels and huge underground people underground. We can imagine that the earthlings are divided into surface and insider, and that the underground people of the underground kingdom must have mastered science and technology higher than that of the surface people, so that it becomes logical for them, the same star of the earthlings, to travel through space in flying saucers that the earthlings cannot yet make.

The absurdity of this theory lies in the fact that the earth is not hollow at all. All the claims about the Earth's hole are all rumors and fake news: The Earth is the densest star in the solar system, and if there really is a huge hole inside, the mass of the Earth will never reach this number. What's more, the earth has a strong magnetic field, and the strong magnetic field of the planet (the generation mechanism of the stellar magnetic field is different from that of the planet) means that it has a huge iron core, which completely excludes the possibility of a hole in the earth's core.

Mixed people said

The idea is that aliens live and work among us. In some of the photographs taken by the researchers with a surprising new radiation camera, some people were surrounded by a pale green halo around their heads, possibly caused by rays emitted by their brains. However, when trying to query the people with halos, it was found that the people had disappeared completely, and there was not even any sign of their former existence. Aliens are hiding among us and we don't know what they're going to do, but there's no evidence that aliens can harm us. This theory is like a believer's inability to prove the existence of God, pushing all the parts that need to be proved to the unprovable.

The first human beings said

There is an opinion that the ancestors of mankind were aliens. About tens of thousands of years ago, a group of aliens with a high degree of intelligence and scientific and technological knowledge came to the earth, and they found that the environment of the earth was very suitable for their habitation, but because they did not bring sufficient facilities to cope with the geocentric attraction of the earth, they changed their original intention and decided to create a new human race - the combination of aliens and earth ape-man. They targeted female apes and tried to impregnate them, resulting in today's humans.

In fact, the genetic evolution of human beings is very regular, and there is no explosive emergence of a large number of new genes in a very short period of time (relative to geological time), and more importantly, the existence of apes is much earlier, tens of thousands of years ago human beings have long been formed, if aliens have done anything to interfere with this, it should be in the era of more than 4 million years, the geological span is more than 2 million years, this number is too large, and it is by no means the result of high technology.

Parallel world said

The universe we see (i.e., total galaxies) cannot be formed within the four-dimensional universe, that is, the world around us is not just formed in the dimensions of length, width, height, and time. The universe may be made up of two worlds adjacent to each other, and although they are connected to each other, they are almost transparent to each other, and the two material worlds are usually "shadow" worlds that have little interaction with each other. When these two stacked worlds are formed, they are "composite" into one with great interaction force, and various substances are highly mixed together to form a unified world. Later, the universe expanded, and at this time, the density of matter decreased, and the gravitational force decayed, resulting in two worlds that were actually separate from each other. In other words, it is entirely possible to exist in the same time and space in an invisible parallel world adjacent to us, which may or may not be very similar to ours, or it may be completely different from ours. The laws of physics and chemistry may be the same, but the actual conditions are different. These two worlds were "each dominant" as early as 200-15 billion years ago. Therefore, it is possible that the UFO came from that other world. It may have been accidentally intruded under some special conditions, or it is more likely that they have already mastered the knowledge of traveling between the two worlds, and often travel between the two worlds, and their technological level is far beyond that of us humans.

Four-dimensional space said

Some people believe that UFOs come from the fourth dimension. The ghost-like aircraft disappears in an instant, and the network of artificial satellite electronic tracking systems cannot be watched at all when it is turned on, so it can be assumed that the crew of the UFO is playing with time and space. A technical means can form some local spatial curvature, and this local curved space can then expand in the space in contact with it, and after this step is completed, people from another space can come to our space. As various sightings have reported, concrete and tangible creatures suddenly emerge from the ground near a UFO, rather than apparently running out of a door. The above statement can be used as an explanation for these situations. The absurdity of these two theories lies in the fact that it has been shown that all dimensions except 2D and 3D space are curled up dramatically.

Future life said

Some scientists believe that the so-called aliens are the future humans of the human world. There is data that humans have evolved more rapidly in the last hundred years than in primitive times. We also cannot deny that perhaps when human beings evolved to hundreds of millions of years, they became what we call aliens today, and mastered the technology to travel through time and space, and came to the human world.

Aliens are not a definite race of organisms, but are just a few of the more common terms heard in human society.

Pleiades, Siriusians, Lyrasians, Elohims, Reptiles, Greys

Search for extraterrestrial life

As part of the quest to explore the mysteries of the universe, scientists are also actively exploring life beyond Earth and searching for information about extraterrestrials. This scientific exploration began as early as the 50s of the last century.

In 1959, Coconi and Morrison co-authored an article that appeared in the prestigious British journal Nature. The article says that according to their calculations, if there is intelligent life elsewhere in the universe, and their level of science is comparable to our level in 1959. Well, they should be able to receive radio signals emitted by earthlings. In the same way, if they want to send us a radio signal, we can receive it. Although the distance is extremely far, it takes thousands or hundreds of years to talk a word, but it is possible to communicate after all. The two of them also studied the optimal wavelength for interstellar radio wave communication, which is the 21-centimeter wavelength of a hydrogen atom. Because, hydrogen is the most abundant element in the universe, and its wavelength of 21 centimeters is also easily detectable.

This article has greatly stimulated people's enthusiasm for exploring extraterrestrial civilizations and strengthened people's confidence. Because it tells us that as long as there are aliens, as long as the aliens are at a similar level of technology as us, we can communicate with each other. This article is the beginning of the scientific detection of aliens.

Humans have been living on Earth for about two or three million years. In the past, human beings thought that they were the spirits of all things, the only intelligent life in the universe, and even believed that the earth was the center of the entire universe. Later, with the progress of science and technology, people's horizons were broadened, and they understood that the universe is vast, it is far beyond our imagination, and the earth is too small, and of course it is not the center of the universe. So people imagined that the universe was so vast that perhaps there would be an intelligent creature similar to human beings living on other planets - aliens. Such an idea deeply appeals to some people who are keen to search for aliens.

In the 16th century, when someone used a telescope to observe Mars, they found many interlaced reticulations, and thought that it was a "canal" dug by "Martians". In 1935, an American radio station broadcast that Martians had come to Earth, causing a false alarm. A British writer wrote a science fiction novel called "The Martians", which made many colorful descriptions of Martians, and led to the birth of a series of novels and movies about "Martians".

Were there Martians? In the days when there were only telescopes, it was a mystery. In the sixties, the spacecraft finally went up to Mars and solved the mystery that had always puzzled people: Mars was much colder than Earth, the surface was full of mud and rocks, the wind was often strong, the sand and rocks were flying, and there was no life on it, and of course there were no Martians.

After this mystery was solved, astronomers further analyzed that in the solar system, except for the Earth, other planets do not have the necessary environmental conditions for the survival of life. Therefore, humans on Earth are the only intelligent creatures in the solar system, and in order to find aliens, they must go outside the solar system.

In 1972, the United States launched the Pioneer 10 spacecraft, which flew out of the solar system in 1987, and the metal plates on the spacecraft depicted the image of human beings, the earth where humans lived, and the location of the solar system. In 1977, the American Voyager 1 brought even more information to the outside world, including a sturdy record player and a gold-plated record containing dozens of human languages and musical compositions (including ancient Chinese songs). It is fervently expected that aliens will receive it.

The launch of the Voyager 1 space probe on September 5, 1977, was the first attempt to contact them in a scientific way. Although scientists believe that even if there are aliens, it is impossible to fly to Earth because of the huge distances between the planets, they do not deny the possibility of life in outer space.