Five billion years later, when the life of the sun comes to an end, what will be the fate of the earth?

There are eight planets in the solar system. While they rotate, they also revolve around a common celestial body, which is the sun. Everyone is familiar with the sun. The rising and setting of the sun every day brings light and warmth to the earth, as well as vitality to the earth. The birth of life on earth is closely related to the care of the sun. Without the sun, there would be no birth of life on earth, let alone the birth of human beings.

In ancient times, people regarded the sun as a totem, expecting it to live forever and accompany the earth and human beings forever. However, with the development of civilization, our understanding of the sun is constantly improving, especially after entering the era of science and technology, we understand that the sun is only one of the countless stars in the universe, it is nothing special, and it is not the most powerful celestial body in the universe.

At the same time, a large number of observations and studies also tell us that stars also have lifespan, and with the increasing mass, their lifespan is also decreasing. The end of a star’s life is also the beginning of the collapse of the entire galaxy. Especially for a life planet, the end of the star is also the end of the life planet, is the end of life.

The sun is only a small member of the cosmic star family, and its mass is far less than that of most stars. The mass of stars is good for nature, that is, the gravitational force is more powerful, and it is the dominant celestial body in the universe. Of course, there are advantages as well as disadvantages. The disadvantage of a star with too much mass is its short life span. If it is some super massive stars, their life is often only tens of millions of years, very short.

A star of such mass as the sun is the most favorable for the birth, evolution and development of life. The reason is that its heat is relatively mild and its life span is long enough to reach about 10 billion years. For a living planet, the evolution and development of life is a very long time. Take life on earth as an example. Early simple life was born 4 billion years ago. After billions of years of evolution, intelligent life human was born millions of years ago.

The evolution process from simple life to intelligent life is a very long time, which takes at least several billion years. If the life of a star is not long enough, it will be over before life evolves into intelligent life. All the galaxies of civilized planets in the universe are probably stellar systems with the same mass as the sun.

Even if the life of the sun has reached 10 billion years, it will still come to an end. After 5 billion years, the life of the sun will come to an end. What will be the fate of the earth? Maybe a lot of people will say that. Will they say that? The sun will be destroyed, the earth will not be destroyed with it? Is that really the case?

Normally, when the hydrogen in the sun is completely fused into helium by nuclear fusion, the life of the sun begins to change finally. At this time, the outer layer of the sun will expand rapidly and become a red giant. Although the surface temperature of the sun will decrease at this time, the sun will appear brighter because of its larger volume.

This time point is about 4 billion years later, after all the hydrogen inside the sun is fused into helium, the nuclear fusion reaction will not stop and will continue. It’s just that this time helium is fusing into carbon, and the temperature of the outer layer of the sun is rising again. Until all the helium in the sun is converted into carbon, the sun will throw away its outer shell and evolve into a planetary nebula, while the inner core will collapse and evolve into a dense white dwarf.

The last red giant stage of the sun is very short, only a few million years. When the sun enters the red giant stage, it can seriously threaten the safety of the earth. At that time, the diameter of the sun can grow to 2.42 astronomical units, which is 260 times the diameter of the sun now, and will exceed the orbit of the earth now.

The sun’s expanding orbit will devour the earth’s orbit, and the earth will not be spared at this time. It has been said that after the transformation of the sun to a red giant, the earth may be pushed outward by the sun’s gravity, thus sparing the earth from verification. However, through new research and observation, it is found that the possibility of this kind of situation is very small.

Although we can’t see the phagocytic process of the earth after the sun turns into a red giant in advance, there are countless stars like the sun in the vast universe, many of which have come to the end and are evolving towards white dwarfs. Through observation, scientists found that 410 light-years away from the earth, there is a special white dwarf with a dense celestial body moving around it.

Through the research of scientists, it is believed that the dense object near the white dwarf star may be the core of an earth like planet. The predecessor of this white dwarf is a star like the sun. When its life comes to an end, it turns into a red giant and devours the orbits of the planets around it, leaving behind a dense core.

From this observation, we also understand that under normal circumstances, the earth will be engulfed by the expansion of the sun after 4 billion years, but it can not completely engulf the earth, and finally it will leave us a dense metal core. Seeing here, some people may say that 4 billion years is too far away from us. By that time, human beings may have been an interstellar civilization, and we can give up the earth and migrate to other galaxies.

But in fact, the time left by the earth to mankind is far less than 4 billion years. With the progress of solar fusion, it will gradually become brighter and brighter, and the surface temperature will rise slowly. And this stage does not need to wait until 4 billion years later, about 900 million years later, the rising temperature of the sun will cause devastating damage to the earth’s ecology.

According to the calculation of scientists, 900 million years later, the temperature of the sun will rise sharply, and the temperature of the earth will also rise sharply at that time. The oceans will be continuously evaporated, and other ecological disasters will be triggered. For life on earth, we can’t adapt to such a high temperature. If human beings don’t leave the earth at that time, the end of civilization will be waiting for us.

It can be seen that the time left by the sun to the earth is only about 1 billion years. At that time, the earth may become a purgatory planet like Venus, and the surface water will disappear completely. Life will no longer exist. Therefore, human beings have only lived on the earth for a maximum of 1 billion years, while the earth still has more than 4 billion years to live.

Of course, one billion years is also a very long time for mankind. As long as there are no major changes in human beings and science and technology can continue to develop, one billion years will be enough for human beings to become a powerful interstellar civilization. At that time, human’s steps had already spread all over the galaxy and even the universe, and there was no need to worry about the threat of the end of solar life to us.

And the power of science and technology is infinite. As long as human beings become a powerful interstellar civilization, they may be able to change the fate of the earth. At that time, when the sun expands, we can move the earth outward, away from the sun to the right place. When the life of the sun evolves to the white dwarf, we can move the sun out of the solar system and into other star systems.

Guys, what do you think of this? Welcome to leave a message below to discuss and express your opinions.

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