Intelligent alien civilisations could number 36, says Nottingham University

New research has shown how many intelligent civilizations we should look for - Getty
Smart alien civilizations could be number 36, according to new research from Nottingham University.
Although there is no evidence of an intergalactic life that could communicate with humans, the calculation has given a number of how many different types of scientists should look for.
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Scientists added that we were "not surprised" by extraterrestrial life and that it would likely be similar to humanity.
Researchers said the average distance to these civilizations would be 17,000 light-years, which with our technology would make the chances of encountering such a life very slim. They found that humanity would probably have to survive another 6,120 years for mutual communication.
The paper published in the Astrophysics Journal is based on the assumption that intelligent life would develop in the same way on other planets as on Earth.
They used a theory called Astrobiological Copernican Limit, in which scientists apply evolution on a cosmic level.
Their calculation is a refinement of Francis Drake's first thought in 1961, which set out seven criteria for alien life, ranging from the number of stars in the galaxy to the presence of detectable electronic signals. However, estimates using this equation range from zero to many billions.
There are two astrobiological Copernican boundaries that dictate that intelligent life form in less than five billion years or after about five billion years, based on the fact that a communicating civilization has formed on Earth after 4.5 billion years. At that time, intelligent life would only be formed for planets that are like the earth in the habitable zone of a star and have the correct distribution of the elements.
The first author of the paper, Tom Westby, said: “In the strict criteria that require a metal content equivalent to that of the sun (the sun is relatively rich in metals in relative terms), we expect that there are approximately 36 active in our region Civilizations should give galaxy. "
Scientists estimated the number of Communicating Alien Intelligent Civilizations (CETI), which are civilizations similar to those on Earth and using these limits to send radio signals into space.
Christopher Conselice, professor of astrophysics at the University of Nottingham, led the research.
He said, "There should be at least a few dozen active civilizations in our galaxy, assuming that it takes five billion years for intelligent life to form on other planets like Earth."
Another factor in the equation is how long the technology used by intelligent civilizations such as televisions and satellites sends signals into space. Our technological civilization is 100 years old, and if others are of a similar age, there will be about 36 intelligent technical civilizations in our entire galaxy.
This is the lower limit, scientists said, meaning that there are likely to be many extraterrestrial communities in space if our technological civilization is likely to last well over 100 years.
If all civilizations were found, scientists could find out how long humanity is likely to survive.
The researchers said that if it turned out that intelligent life was widespread and there were many dozen civilizations, we can expect human technological civilization to last for a few hundred years. If it is not, it is not a good sign of human longevity.
Professor Christopher Conselice said: "By looking for extraterrestrial intelligent life - even if we cannot find anything - we discover our own future and our own destiny."

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