Scientists from Washington State University (USA) revised the criteria for searching for habitable exoplanets and re-examined the archives of the Kepler mission. From more than 4,000 distant worlds discovered to date, they have identified 24 planets where living conditions are much better than on our home Earth. Therefore, there is a possibility that a highly developed civilization also exists there.
American scientists did not abandon the previous conditions for the search for life, but proposed to supplement them with what can be called a “civilizational factor”. For example, according to cosmic standards, our civilization is doomed from the beginning, because the Sun, being a yellow dwarf, will last no more than 10 billion years. Of these, 4 billion have already been spent, and intelligent life has just appeared on Earth. Will we, people, be able to build a civilization on a cosmic scale in the remaining time? The answer is not so obvious.
But if instead of the Sun we had a long-lived K-type dwarf star, we would have at our disposal as much as 70 billion years. True, this star gives much less heat, but the icy world has its advantages. On the other hand, if an Earth-like world were warmed up just 5 ℃ above the current rate, most of the planet would become a green paradise. We would get an abundance of water, a lot of rainfall and a huge biodiversity in tropical forests, which bodes well for accelerated evolutionary growth.
There are requirements for the exoplanets themselves – in particular, they must be no smaller than the Earth in order to hold the atmosphere, maintain their own magnetic field, and also have a hot inner core. But what prevents you from choosing a planet for life by 10-20% more? All conditions are met, and the outer area is much larger, there is room for a convenient settlement of peoples. Of the 24 exoplanets noted, none is absolutely “ideal”, although some satisfy two or more criteria. It is to them that the attention of scientists in the future.