Astrophysicists Declare: We Did Not Choose the Best Place and Time to Build a Civilization
By Space Coast Daily // March 11, 2021
In scientific circles, the hypothesis that the presence of life on Earth, and even more so its long evolution to an intelligent form, is a happy accident is increasingly being expressed.
Scientists have already discovered so many problematic factors that it is easier to believe in artificial settlement of the planet by some powerful forces than in the emergence of life here by natural means.
Fresh data came from the Italian National Institute of Astrophysics, where they compiled a history of the Milky Way and found the optimal site for the emergence of life – but it turned out to be in the distant past.
It is known that global extinctions on Earth 2.6 million years ago and 359 million years ago were caused by supernova explosions.
Extinctions due to gamma-ray bursts have not yet happened to us, but this is nothing more than luck, since only in some 500 million years the outskirts of our galaxy have been literally sterilized 2-5 times by long bursts of harsh radiation.
It is these two factors – supernova explosions and gamma-ray bursts – that Italian astrophysicists have called the main threats to life on a cosmic scale.
Both events are closely tied to the processes of star formation and death, which proceeds most intensely while space is filled with light elements – hydrogen and helium. However, the fusion of atomic nuclei within stars and supernova explosions begins to form other elements that are already considered heavy.
This slows the star formation process in a given area of space, and it shifts to other areas. The rule does not apply to the most central part of the galaxy, there is always high activity and life is impossible in principle.
Scientists have calculated that 6 billion years ago, at a distance of 6.5-26 thousand light-years from the galactic center was formed conditionally quiet zone with a minimum probability of supernovae and gamma-ray bursts.
It existed for about 2 billion years, and only then at the very border of this zone arose the planet Earth, and before the appearance of life on it there were still billions of years. The Milky Way is waiting for future catastrophes, collisions and mergers with other galaxies, so the ideal moment for the emergence of life here has irrevocably passed.
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