Mars Alien Underground Structures (Photo : NASA/Ufosightingsdaily)
Multiple theories about other civilizations existing in the universe have been around for a long time, but till date, scientists have not found any conclusive evidence. The subject is a matter of curiosity and thus, astronomers keep researching and now a latest research suggests that other advanced civilization may have existed, but they are very likely extinct.
According to a paper published in NASA's Astrobiology, it is possible to allot a tested probability to the question whether a technologically advanced civilization has ever existed in the universe. This has been made possible by the recent discoveries of exoplanets and a broader approach to the query, Daily Galaxy claims. The paper also sheds light on the twin aspects of pessimism and optimism about the chances of advanced life existing outside the earth.
It says that unless the chances of technically advanced life evolving on a habitable planet are low, then humankind is not the only technically advanced civilization of the universe. According to Woodruff Sullivan of University of Washington, even if there were thousands of civilizations in the earth's galaxy and they lived as long as human beings have been around, then all of them are quite likely extinct.
Also, others will not come to life until human beings are gone and hence, there is not much chance of finding another of our counterparts. In order to find them, they must last way longer than the present lifetime of human beings. Professor Adam Frank, who co-authored the paper, says that NASA's searches led them to approach the query in a different way and instead of asking the number of civilizations that may exist now, they looked into the fact if human beings are the only technological species to have ever arisen.
The changed perspective helped them calculate the probability against advanced life occurring in order for humanity to be the only technically sound civilization in the history of universe. This finding led Sullican and Frank to conclude that human civilization is likely to be one-of-its-kind only if the likelihood of another civilization developing on a habitable planet is less than around one in 10 billion trillion.
The following video talks about other intelligent civilizations:
