Scientists have decided that the observed lack of signals from advanced alien civilizations is a bad sign for Earthlings. The lack of signals indicates that civilizations are short-lived, which should make us think about preserving our own civilization.
Civilizations on Earth are short-lived. The Roman Empire declined in less than a thousand years, and the Mayan civilization lasted no more than two thousand years. At the same time, the risk of civilization’s demise grows as it develops, so many scientists believe that today’s human civilization has not long to live. The gloomy predictions are also confirmed by the fact that there are no alien civilizations visible in the observable universe — researchers believe that if they did exist, they are already dead.
“Even if we receive a radio signal from a distant galaxy, the civilization that sent it is already very likely dead. But the universe is very big, so somewhere, of course, there must exist worlds with intelligent inhabitants. In our Galaxy alone, there must be at least a few dozen,” say scientists Tom Westby and Christopher Conselis of Nottingham University in England.
Scientists estimate that there are 36 advanced alien civilizations in the Milky Way galaxy capable of sending radio signals into space. “There are 200 billion stars in the Milky Way. Twenty percent of them have planets in the so-called habitable zone, but some of the star systems must be excluded because they lack the elements necessary for the development of life. If we consider the fact that an alien civilization capable of sending radio signals can survive for 100 years, there should be 36 such civilizations in the Milky Way today,” say the authors of the paper.