A new theory emitted by the scientific society says that aliens are extinct and that is why they haven’t reached to us yet, or why we haven’t discovered any sign of their presence.
The Fermi’s Paradox dictates that the conditions that lead to the development of intelligent life are rare and there is a multitude of factors that contribute to the event, factors that have to coincide. According to this hypothesis, a sort of wall appears during the evolutionary process of life that prevents any further progress. This translates into the fact that there might be life out there, it’s just not intelligent enough.
But two astrobiologists from the National University of Australia, Charley Lineweaver and Aditya Chopra, do not necessarily agree with the Fermi’s Paradox. They think that all life forms, no matter the degree of intelligence, become extinct at a certain point in time.
The two state that there are many planets that seem suitable to sustain life as we know it, but the life forms rarely outgrow their bacterial state. The Gaian Bottleneck, as they have called their hypothesis, dictates that while there could be a large number of planets capable of sustaining life, at a certain point in time something happens and they become unfriendly.
To support their theory they give the example of Earth, Mars and Venus which, at the time in which microbes began to evolve on Earth, were all capable of sustaining life. But Venus and Mars lost their atmospheres, the surface temperature became unstable and so Earth remained the only planet on which life could evolve.
Also, the team says that life itself helped the evolutionary process because of the oxygenisation atmospheric cycle. Mars, too, had once water and an atmosphere but due to unknown conditions it became a barren wasteland so all possible aliens are extinct.
At the present moment, the Kepler telescope discovered around 1,039 planets that have a similar structure to Earth, but no life signs. According to the Gaian Bottleneck theory, all the life on these planets is extinct due to uncontrolled factors that rendered the planets uninhabitable.
What the Gaian Bottleneck theory lacks is perspective. While the variants may be well calculated, the authors did not take into account the fact that life, as it already proved, can evolve and adapt. If one of the planets in question loses the capacity to produce oxygen and carbon dioxide, there might be another gas to take their place. And bacteria that proliferates in sulfur-filled environments have already been discovered. So maybe aliens are extinct because we were looking in all the wrong places.
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