Although human beings have done a lot of exploration, so far, they have not found any life beyond the earth. The earth is the only living planet we know. Can we directly determine that there is no alien life and civilization in the universe?
Of course not. Although we have not found the existence of extraterrestrial life, but it does not mean that we are the only, this is the view of frog in the well. We can’t find that the biggest reason is that the current technology is still too backward in the face of the universe. Even though we have launched a lot of space probes or telescopes that can see the brilliance of 10 billion light-years away, we can only understand the outline, not the details.
The universe is vast. At present, people think that the diameter of the observable universe is 93 billion light-years. Even if we don’t talk about the whole universe, our galaxy alone has hundreds of billions of stars, not to mention the number of other celestial bodies. So, for such a big universe, alien civilization must exist.
In 1961, American astronomer Frank Drake proposed the Drake equation, which can calculate the number of high intelligent civilizations inside and outside the galaxy that may contact us. But Drake’s equation estimates range from zero to billions.
However, according to sources, studies have shown that,
Among the hundreds of billions of stars in the spiral arms of the galaxy, there are 36 alien intelligent civilizations.
According to astronomer Christopher comsels of the University of Nottingham, Drake’s equation is more like a thinking tool, which can’t really solve problems.
He and his colleagues are interested in experimenting with new data on star formation and the presence of exoplanets. So on June 15, they published a paper in the Astrophysical Journal, explaining their results of using new data and assumptions to improve Drake’s equation.
They first calculated the age distribution of stars in the Milky way and found that there are at least 5 billion stars in it. Then they found that 97% of the stars in the Milky way are over 5 billion years old.
After that, they calculated the number of planetary systems and stars with sufficient density and stability, and one third of the 5 billion year old stars previously screened met the requirements.
Then, they estimated the number of rocky planets in the habitable zone of these stars, and calculated the stars with enough metal content to provide the necessary elements for the rocky planets around them to build various infrastructures (such as radio transmitters).
Finally, they set the life span of a civilization with communication capabilities at 100 years, based on the earth’s time line that has used radio technology so far.
The results show that there are 4-211 civilizations inside and outside the galaxy, while there are 36 civilizations with intelligence and ability to communicate with human beings whose life evolution trajectory is similar to that of the earth. If alien civilizations were evenly distributed in all parts of the galaxy, then our nearest “neighbor” might be 17000 light-years away. And they also said that it will take at least 6120 years for our earth civilization to have two-way communication with higher civilization.
What do you think of this? Welcome to comment area.