Aliens in ancient times already lived on Earth, said in his research paper Jason Wright, professor of astronomy and astrophysics at Pennsylvania State University.
For some reason, when it comes to scientific works that fall out of the "generally accepted scientific worldview" they are not written about anywhere or quoted in the media.
The professor published his article in 2017 and can be found on arXiv. It is called "Previous indigenous technological species".
Jason Wright came to the conclusion that advanced alien life forms once existed on Earth.
In the article, he writes that the alien "technological species" lived on ancient Earth, Venus and Mars. It was at the time when Venus and Mars had an atmosphere, oceans and were similar to Earth.
Professor Wright writes:
Given that the Earth contains complex life, the most obvious origin for an antecedent species of any kind is the Earth.
Modern Venus would seem to be a terrible candidate for a technological species, with a surface temperature of around 735 K (462 ° C). Although, when it comes to alien life, we must be open to even this possibility.
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While ancient aliens may have left Earth, evidence for the existence of so-called "technosignals" may have survived underground.
The main difficulty lies in the fact that over the past millions of years since then, most of the physical evidence has been lost.
For example, on Venus, the global appearance of greenhouse gases could lead to the rise of the planet's surface.
While on Earth, the movement of tectonic plates and subsequent erosion could destroy any remaining evidence of the life of a previous civilization.
However, it would still be possible to recognize technosignals even if the physical evidence were destroyed.
Structures buried under the surface of the Earth, Venus, Mars - could have survived and can be discovered.
Even if these structures suffered from cataclysms, it made them non-functional, but they can still be recognizably technological.
We could assume that settlements or bases on Earth, Venus, Mars, as well as their satellites, were built underground for various reasons, and therefore can still be discovered even today.
One of the options may be to search for traces on tectonically calmer surfaces on other cosmic bodies in the solar system.
The most obvious reason for the extinction of the alien race was a global cataclysm, be it a natural event such as the fall of an asteroid that caused the extinction of species, or such as a global climate catastrophe.
But in the case of a species that settled elsewhere in the solar system, such an event would permanently destroy the alien species if there were many cataclysms throughout the solar system, closely spaced in time (a swarm of comets or interplanetary war, perhaps), or if the settlements were not completely self-sufficient
In addition, an unexpected nearby gamma-ray burst or supernova can cause a cataclysm across the entire solar system.
Even without a cataclysm, a species can simply die out, or become permanently non-technological at some point, or it left the solar system forever for some reason.
Interesting theories from a respected scientist, which for some reason do not want to draw public attention. Indeed, in fact, the study confirms the many facts that prove that before the appearance of people on Earth, a highly developed civilization already existed here.
This is evidenced by the finds of artifacts in coal seams, which are hundreds of millions of years old. This is evidenced by megalithic structures, pyramids around the world, the purpose of which is not fully known to us, and many legends, legends, textual historical documents describing the contacts of earthlings with aliens.
Scientists continue their mantra - we are the most developed, we are the only intelligent in the entire Universe. Really? But what about the facts that hundreds of unidentified aircraft fly in the earth's sky, the lower and upper layers of the atmosphere, in orbit and even in space, to whom do they belong?