Points of View on the Existence of Intelligent Life in the Milky Way
People have never met extraterrestrial
However, time passed, and such contacts neveroccurred, so scientists doubted the Drake formula. Among them was Enrico Fermi, after whom the “Fermi paradox” was named. It is formulated as follows: if alien civilizations exist, why can't we find traces of their presence?
There is still no definite answer to this question. There is a point of view that there were unique conditions on Earth for the origin of life: such can hardly be repeated. However, today science has discovered many earth-like planets at the stars closest to us.
How did British scientists work?
British astrophysicists took as their basiscomputing the hypothesis that intelligent life on other planets of our galaxy could have formed in the same time and under similar conditions as on Earth.
All calculations were based on the assumption that the possibility of the development of life depends on several parameters: they are called the astrobiological limits of Copernicus.
The first parameter is the age of the planets, it should benot less than 5 billion years. The second parameter is the high metallicity of the stars in whose orbits the planets are. For the origin of life near the planet there must be a star similar to the Sun, due to which a large concentration of heavy elements appears. Based on these two conditions, scientists received a hypothetical number of civilizations that live in the Milky Way: about 36 different species.
I think this is extremely important and exciting: for the first time, we have an estimate for the number of active developed civilizations that we could potentially contact and discover that there is another life in the universe.
Christopher Conselis, professor of astrophysics at the University of Nottingham and co-author of the study
How did scientists get around the Fermi paradox?
Researchers from Nottingham and colleaguescame to the paradox in terms of chemical and biological evolution. We do not see extraterrestrial civilizations, since the main limiter of their formation may not be specific conditions on individual planets, but the general level of the chemical evolution of the Universe and the rate of development of life.
At the first stages of development, the Universe consisted onlyof the three elements - hydrogen, helium and lithium. Oxygen, carbon, nitrogen, and other elements making up proteins were absent. They began to accumulate after the first stars were lit and burnt out. This means that in the galaxy in the first stages of its development there were not enough elements necessary for the origin of life.
If there are really about 36 species, then how can I contact them?
36 is, of course, an approximate amount. It very much depends on how long intelligent civilizations are at a sufficiently high level of development to send signals about their existence into space. The lifetime of an active intelligent civilization on Earth, for example, is only about 100 years.
Research sheds new light on intelligent life existing across the galaxy
A new study led by the University of Nottingham and published today in The Astrophysical Journal has taken a new approach to this problem. pic.twitter.com/LXQhwKdyOQ
- Lunar Astronomy; Moon 'Exploration & Coloniz / News (@ DubnHG1) June 15, 2020
The closest alleged intelligent civilizationis several thousand light-years away from us. Our observational instruments cannot pick up radio signals or flashes of light from such a distance. More precisely, they can, but these signals will go for several millennia. The same situation with aliens: we launched signals into space about our existence, but they will not reach soon. Until this moment, no one will know that we live on Earth.
If humanity receives such signals in the future, it will mean that highly developed civilizations can exist for a long time.
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