Five billion years later, the sun became a red giant. What is the process of the destruction of the earth? Do humans have time to escape?

In about 5 billion years, the sun will become a red giant, with a rapidly expanding volume and a radius of more than 200 times. The periphery will expand to the earth's orbit and devour the earth, even Mars, and everything on the earth, including the earth itself, will cease to exist.

When a star passes through a long youth-main sequence star stage and enters an old age, due to its own fuel shortage, the radiation pressure brought by nuclear fusion is not enough to compete with its own gravity, so its core will contract and collapse under the action of gravity, and its density and pressure will rise sharply. At the same time, its shell will expand rapidly, and the temperature will drop continuously while expanding, and this process will only last for hundreds of thousands of years.

The nuclear fusion of the sun only occurs in the core with extremely high density and pressure, and the hydrogen fuel in the outer layer cannot enter the core to participate in the fusion. As a result, when the sun entered the red giant stage, it blew the outer atmosphere into space, leaving a useless white dwarf. Although it will be 5 billion years later, the energy output of the sun will continue to increase. About 654.38 billion years later, the liquid water on the earth will evaporate due to high temperature, and the earth is no longer suitable for life.

As the sun becomes a red giant, its volume will expand a lot. At present, the size of the sun is amazing, which is 6.5438+0.3 million times that of the earth, but when it becomes a red giant, its size will increase to more than 8 million times.

For a star like the sun, the main sequence star stage is about 8 billion years, not more than 654.38+0 billion years. We usually say that the life of the sun is 5 billion years, but it still has so much life at most. Before that, the earth was no longer suitable for human survival.

To tell the truth, 5 billion years is still far away. It is better to care about how human beings will live in 5 billion years because the sun has become a red giant. Not to mention 5 billion years, even after 1 100 million years, it is unlikely that human beings will still be on the earth. Because of the development of science and technology, the earth can no longer meet the needs of human beings, so the earth will definitely be abandoned. Billions of years later, if human beings still exist, there is no reason not to travel between stars. Once interstellar travel is feasible, will interstellar immigrants be far behind? The sun should not pose any threat to mankind.