Will the earth die one day?

The decline of the earth will take 4.5 to 5 billion years.

It is speculated that the earth has survived for 4.6 billion years. But how long can it live? I'm afraid no one can say for sure.

Scientists believe that if the earth is allowed to run freely, I am afraid it will exist forever, but if other external factors interfere with it, the earth may die.

The external factor is the sun first, because it is the closest planet to the earth and can be doomed on the right earth. In other words, all the energy and power on the earth comes from the sun. If something happens to the sun, it will certainly hurt the earth. Before the 1930s, people always thought that the sun would burn out one day, changing from white to orange and then to red, and finally becoming a dark star, ending its glorious life. In the 1930s, when physicists learned the secrets of the sun's light and heat, the situation was completely different. It turns out that the energy of the sun comes from its thermonuclear reaction, and the sun will go through gravitational contraction stage, main sequence star stage, red giant star stage and dense star stage in its life. The main sequence star stage is the stable period of the sun. This stage will last 654.38+00 billion years. At present, the sun only spends half its time and is in middle age. Once the sun reaches the red giant stage, the end of the earth will come. Of course, this is billions of years later. According to scientists' calculations, the age of the earth now is 4.5 billion to 5 billion years. Studies on other declining planets show that the earth is in middle age, which means that it will take about 4.5 billion to 5 billion years for the earth to decline.

Are there other factors besides the interference of the sun on the earth? Some scientists believe that the sun may have a brother-the companion star of the sun, which revolves around the sun day and night. Every 26 million years, it will turn to the nearest place to "make waves", and its strong gravity will cause great disturbance to many comets. There will be 654.38 billion comets rampaging in the solar system, and planets such as the earth will become the "targets" of these comets. If the mass of the comet hitting the earth is large enough, the consequences will be unimaginable: extinction of photoorganisms and ecological upheaval; In the worst case, the earth will be shattered. However, this sun companion, which may bring accidents to the earth, has not been discovered, but many scientists believe it exists.