With the development of science and technology, mankind soon realized the dream of flying to the sky, walked out of the earth and began to explore the universe. When we walk out of the earth, we realize the vastness of the universe and the smallness of the earth. At the same time, we are thinking about a puzzle that puzzles countless people: how many planets with life and intelligent civilization will exist in the galaxy.
If you think that the whole galaxy or universe has only one life planet, earth, and only one civilization, what’s the difference with frog in the well. Human beings are a great civilization of science and technology. Naturally, they are not frogs in the bottom of the well. Therefore, most people always believe in the existence of alien civilization, and scientists believe it deeply.
There is no doubt about the existence of extraterrestrial life and alien civilization, so some people have another question: how many living planets and alien civilizations will there be in the universe? The universe is so vast that it is difficult for us to estimate how many living planets and civilizations there are. We can only take the second place and estimate the number of living planets and alien civilizations in our galaxy.
Although human science and technology is still relatively backward and has not yet been able to explore the solar system, scientists have invented such a powerful artifact as the astronomical telescope, which can observe very long distances. At present, human beings can observe some celestial bodies tens of billions of light-years away by relying on astronomical telescopes and other observation equipment. Of course, such celestial bodies are basically similar to supermassive black holes Super massive objects such as stars or clusters.
The observation ability of astronomical telescopes is also limited for ordinary celestial bodies. Scientists mainly focus on the radius of 1000 light-years away from the earth to find earth like planets through astronomical telescopes. In this range, scientists have found hundreds of earth like planets very similar to the earth, many of which are located in the habitable zone, and they all have the possibility of life, which is very important It is possible that some of them also gave birth to intelligent civilization.
Scientists say that the hundreds of earth like planets discovered so far are only the tip of the iceberg, which may be less than 1% of the total number. If calculated by 1%, there are at least tens of thousands of earth like planets similar to the earth within a radius of 1000 light years. The diameter of the Milky way reaches 100000 light-years, which is the previous measurement. According to the latest exploration of the Milky way by Chinese scientists, its diameter may reach 200000 light-years.
How many earth like planets are there in the Milky way with a diameter of 200000 light-years? Scientists estimate that there may be hundreds of billions of stars in the Milky way, and the number of planets is even more incalculable. The number of planets is at least several times more than the number of stars. Based on the most conservative estimate of 100 billion stars, there will be at least 300 billion planets.
Planets are divided into rocky planets and gaseous planets. The earth belongs to rocky planets, and scientists are mainly searching for life planets according to the earth’s standard. The number of such earth like planets may only account for one percent of the total number of planets, so the number of earth like planets may be about 3 billion. If only one percent of the 3 billion earth like planets have life, there will be 30 million living planets.
However, scientists believe that although there are many extraterrestrial life planets, there are few that can evolve to the civilization stage, because the civilization stage of biological evolution on a planet takes an extremely long time, and many life planets are difficult to maintain a stable ecological environment for a long time.
This can be seen from the solar system. Although there is only one living planet, the earth, in the solar system, scientists have found that in the early days of the solar system, Venus and Mars were also very likely to be living planets. We can’t rule out the birth of intelligent civilization, but later we didn’t avoid all kinds of disasters, including super volcanic eruptions and small trips Star impact, they will cause mass extinction.
One of the reasons why the earth has been able to develop safely up to now is that there are two protectors outside the earth. One is the giant Jupiter, which blocks most of the asteroids coming to the earth. The other is the moon, the moon’s satellite. The moon is also a big planet, and its gravity can make some of the asteroids collide with the earth The star has shifted.
It is these two planets, one big and one small, that protect the earth from the impact of asteroids. Without the protection of these two planets, especially Jupiter, the earth may become a barren planet like Mars. This shows how difficult it is for a living planet to grow into a civilized planet.
Although a planet will experience a lot of hardships to become a civilized planet, there are too many similar earth like planets in the Milky way, at least 30 million. Even if there is one in ten thousand probability that a civilized planet will appear, there will be at least 3000 civilized planets. But in fact, when an earth like planet becomes a living planet, the probability of becoming a civilized planet will be very high, which may be far higher than one in ten thousand.
If there is a one percent probability of the birth of civilized planets, the number of alien civilizations in the galaxy may not be less than 300000. This is just the number of civilizations in the galaxy. If we zoom in to the whole universe, the number of living planets and civilized planets is beyond estimation.
Of course, the above is just a scientist’s estimate. We don’t know how far the error is from the real data. It may be very close or very different. If we want to really understand the number of living and civilized planets in the galaxy, we have to continuously develop science and technology. When we can cross the galaxy one day and travel to every corner of the galaxy, we can understand this problem.
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