The earth is a beautiful ecological planet and also the homeland where mankind has survived for millions of years. One very important reason why the earth can become a rare planet of life in the universe is that it has the selfless gift of the sun. I believe many of my friends know that the solar system is centered on the stellar sun, and the most important celestial body in the entire galaxy is the sun.
The solar system appeared because of the birth of the sun. Without the sun, there would be no current solar system. We must know that 5 billion years ago, the current position of the solar system was just a cluster of nebula. Under the action of gravity, the dust and matter in the nebula continued to gather toward the center, forming the early solar celestial bodies. After the formation of the solar celestial body, it continues to absorb the surrounding nebula material through gravity, and finally ignites the internal nuclear fusion to evolve into a star.
After the sun evolved into a star, the remaining scraps continued to form various planets and other small celestial bodies. The early solar system was very unstable. At that time, there were about 100 planets. However, due to the unstable galaxy environment, there were constant collisions between the planets, and only eight were left.
After the solar system is stable, the earth slowly begins to form a good ecosystem, and it has the ecological environment needed for the birth of life. It can be said that it is the existence of the sun that relies on its strong gravitation to constantly balance the orbits of the planets in the solar system, and finally form a stable and harmonious solar system.
With this stable galaxy environment, the earth can hope to give birth to life, life can continue to evolve and evolve, and finally, intelligent life human beings will be born. Therefore, in a sense, the sun is the mother of life on earth. Without the sun’s selfless gift of sunshine, there would be no civilized planet. Therefore, the rise and fall of the sun directly determines the fate of the earth and mankind.
So can the sun exist forever? The answer is impossible. I believe everyone knows that stars are actually not long-lived. Depending on their mass, the lifespan of stars varies from tens of millions to tens of billions. Yellow dwarfs like the sun are small. A star has a relatively long life span, reaching 5 billion years.
Today’s sun has gone out of the spring and autumn of 5 billion years, and in another 5 billion years, its life will come to an end, and then it will continue to evolve into a white dwarf star. Many people may think that when the sun’s lifespan comes to an end, the earth will also come to an end, and humans will not be able to survive on the earth at that time. Therefore, there are still 5 billion years left for mankind, so is this data correct? Actually it is not correct.
Scientists believe that although the sun has a lifespan of 5 billion years, the earth can’t hold on to this time, and the time that humans can live on the earth is far less than this number. How is this going? In fact, there are many factors that determine how many years humans can continue to live on the earth. And this factor is mainly divided into internal factors and external factors.
The internal factor is naturally the ecological changes of the earth itself. I believe many people understand that after humans have entered the era of technology, the rapid development of industry has caused the earth’s ecological environment to continue to deteriorate rapidly. If this deteriorating trend cannot be changed, the time left for humans by the earth may not be too long. Some scientists have predicted that the ecological environment of the earth may completely collapse within hundreds of years. At that time, humans will not be able to stay on the earth. Continue to survive.
Nowadays, ecological and environmental issues and climate issues have become serious predicaments facing mankind. Scientists will warn mankind of ecological deterioration every year. This is the conclusion drawn by scientists through a large number of surveys and observational data. In fact, if the ecological environment continues to deteriorate, hundreds of years will be considered an ideal time. Some scientists even predict that in 2160, the earth will become a desolate planet. This time is only 140 years away from us, which is a short time.
Some people may think that in 140 years, how could the ecology of the earth deteriorate to such an extent that it cannot be inhabited by humans? In fact, this prediction is not unfounded. We can see that in recent years, the earth’s temperature has hit a new high each year. In June of this year, the Siberia region of the Arctic even experienced a high temperature of 38 degrees Celsius. An extremely cold place in the past can have a high temperature of 38 degrees Celsius, which shows how serious the global greenhouse effect is now.
If the greenhouse effect develops according to the current trend, it is indeed possible that the earth’s ecology will completely collapse in more than 100 years. If this is the case, then we are far from waiting for the day when the sun’s lifespan will come to an end, and we need to leave the earth to live on other planets. This is the dilemma that the earth body needs to face.
These dilemmas that the earth itself may face, as long as human beings can work together, there is still hope to control them. But if it is an external factor outside the earth, then humans may be powerless. We all know that the earth is just a tiny planet suspended in the universe. In the vast universe, there are too many disasters that can directly destroy the earth.
The most likely thing to happen is a small row impact. 65 million years ago, an asteroid with a diameter of only 10 kilometers hit the earth, which wiped out the dinosaurs that had dominated the earth for 160 million years. It can be seen that the destructive power of asteroids hitting the earth is huge, and the solar system is a star system with too many small rows.
Asteroids with a diameter of 10 kilometers are nothing in the solar system. There are many asteroids with a diameter of more than 100 kilometers. If one day in the future, an asteroid with a diameter of hundreds of kilometers hits the earth, then the earth’s ecological collapse is doomed, and it may even break the earth into several pieces.
Even if the earth is very lucky and has not been hit by a large asteroid, then as the life of the sun continues to approach, its brightness will increase year by year. What follows is that the temperature of the earth will continue to rise. Therefore, even if we can solve the greenhouse effect caused by industry, the overall environmental temperature of the earth will continue to rise because of the increasing brightness of the sun.
And before the sun reaches its end of life, it will continue to expand and transform into a red giant. This point in time is about 1 billion years. Once the sun begins to expand, it will continue to swallow the orbits of the planets, and eventually the earth will be swallowed by the sun. Therefore, even if the earth itself does not collapse, the orbit of the earth will be swallowed in 1 billion years.
It can be seen that the time left to mankind by the earth is far from 5 billion years, ranging from hundreds of years to as many as 1 billion years. And if human beings want to continue in the universe, they can only work hard to develop technology. Only the power of science and technology is strong. When we become a powerful interstellar civilization, at that time the universe is so big that our homes are everywhere. Naturally, there is no need to worry that the earth is gone and human beings have no place to live.