As the human being advances in his knowledge of the Universe, it is proven that there are less and less isolated and unique phenomena. So, in theory, if life was given on our planet, it has necessarily had to happen on other planets.
This deduction has been so evident to all scientists that they have unraveled the physical laws that govern the universe, that it has had to be admitted even by people as skeptical as Carl Sagan or Stephen Hawking. Even the Vatican, so reluctant to consider the existence of extraterrestrial life, has ended up admitting that, if it exists, and if one day we have obvious evidence of such existence, we must admit that it was equally created by God.
The matter took an unexpected turn when two scientists awarded a Nobel Prize in Medicine in 1962, James D. Watson and Francis Harry Compton Crick, developed a theory that considered life on Earth to be of extraterrestrial origin. This idea was known as the panspermia theory.
But nobody run to look for little green men, because what this theory really defends is that the organic molecules arrived on the sterile primitive Earth aboard a meteorite. These molecules, when landing in acidic and quite chemically aggressive conditions, reacted with other fully terrestrial atoms beginning to develop the first forms of life, which were gaining in complexity as they evolved.
Nor has the Kepler mission been the first one created by NASA with the intention of answering the question of whether we are alone in the universe. Decades ago, in 1970, an initiative to search for radio signal emissions in the Universe began, which showed a series of peculiarities that could rule out its natural origin and therefore, that could only be produced artificially.
Such was the great reception of this project that even a subproject, called SETI home, in which any person with a sufficiently powerful computer could register and put it to analyze signals, in order to help the general project and be able to scrutinize a greater number of collected signals. Still, to date it has not been possible to detect a single signal whose origin is exclusively artificial.
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