The life of the sun is still 4.5 billion years, what about humans?Humans may have only 100 million years left

The survival and development of life requires constant sources of energy, and the only source of energy on the planet is the sun.

Why do you say that? Because as long as we live, we must fight the increase of entropy, and the only way to fight entropy is to intake energy, that is, eating. We get energy by eating other animals, and other animals also need to obtain energy by eating, such as cattle and sheep need to eat grass. Grass does not grow up out of thin air. It needs to solidify the energy in the sun through photosynthesis and convert it into its own energy. Therefore, trace the roots, and all the energy on the earth comes from the sun. In addition to the solar energy on the earth, isn't it still energy, water energy, tidal energy, and geothermal energy? These energy, including fossil energy such as coal and oil, are still solar energy.

The survival of the earth's life depends on the sun, so the length of the sun's life is directly related to the time of the existence of the earth's life.

The earth is the planet and the sun is a star, but it is not stars, but planets that can really survive sustainable in the universe. In theory, the life span of the planet is not stopped, especially the rock -quality planets like the earth. Its quality is very small. Even in the past few billions of years or even tens of billions of years, it will not have any essential changes. But the stars can't work, the star is too big. The greater the quality of an object, the greater the gravity. Stelings like the sun, the huge gravity inside it can cause the entire star to collapse the center, and the only outward expansion pressure generated by the hydrogen nucleus fusion. However, the hydrogen nuclear fusion is to consume energy. With the exhaustion of the hydrogen internal hydrogen in the sun, the star will collapse further towards the center.

The stars' further collapse towards the center will cause the pressure and temperature inside the star to continue to rise, so the element element is ignited, and the star is officially entered from the nuclear fusion phase to the nuclear fusion stage. At this point, the main sequence star stage of the star is over.

At the end of the main stars, the stars will flash, and the huge energy will be released instantly. From the distance between the sun and the earth, this energy is enough to completely destroy the earth's ecology. After that, the nuclear agglomerations inside the sun gradually advance to the heavier elements, and the volume of the sun will continue to swell, and eventually swallow the earth's orbit. At this level of sun -level stars, the internal nuclear fusion can only be advanced to carbon or oxygen, and it will be suspended afterwards. After that, there is no power to prevent the stars from collapsed inward. In the end Very small star, white dwarf.

The life of the stars is limited, and the sun, as a medium -quality star, has a life span of about 10 billion years, and now the sun is more than 5 billion years old.

In this way, the life of the sun is at least 4.5 billion years. Even if the main sequence star stage of the sun is calculated, it is not less than 3 billion years. We have developed into an interstellar civilization. At that time, even if the earth is swallowed by the sun, we can move to other livable planets in the universe. However, the actual situation is not so optimistic, because it may be 100 million years left for humans. Why do you say that? There are indeed billions of years before the sun flashes and sharp expansion, but this does not mean that the sun will not change before that.

At all times, the substances generated by the nuclear agglomeration will accumulate inside the sun, and this accumulation will increase the volume of the sun slowly.

In a short period of time, it is difficult to feel that the increase of the solar volume is difficult to feel, but if the time span is extended to 100 million years, the expansion of the solar volume may reach 1.25 times. The average distance between the earth and the sun is about 150 million kilometers, so even if the volume of the sun increases by 1.25 times, it is still far from the earth. What can I worry about? The expansion of the sun means that the distance between the sun and the earth is closer, which will inevitably lead to the rise of the earth's temperature. In fact, including humans, the living conditions of the earth's life are extremely harsh. If the average temperature of the earth increases by 10 degrees, it will bring huge disasters, and there will be a large number of species extinction.

If the volume of the sun increases by 1.25 times, it means that in some areas on the earth, there will even be a high temperature of nearly 100 ° C. Such the earth can no longer be called a livable planet.

As a rocky planet, the earth is extremely strong in itself, but the earth's ecology is extremely fragile, so we cannot infer the time of the life of the earth with the life of the sun. It is difficult to become an interstellar species, but it is not impossible, because from the period of the ancient apes in the southern southern, human beings fly into space in only 3 million years, and even set foot on the planet outside the earth. If we give us more than 100 million years, what kind of height will civilization reach today is unpredictable today. We can only tell our children and grandchildren: "Human parties leave Earth Day, and the family sacrifice is not forgotten Nai Weng."

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