If humans are still alive when the sun becomes a red giant, how can we save ourselves?

According to the evolution law of stars, our sun will definitely become a red giant in the future. The volume of the sun will increase by about 2.3 million times than it is now, and it will expand enough to annex the earth's orbit. If the earth is still in today's orbit, it will undoubtedly be swallowed up by the sun and buried in the vast sea of fire of the sun.

According to the evolution law of stars, our sun will definitely become a red giant in the future. By then, the volume of the sun will increase by about 2.3 million times than it is now, and it will expand enough to annex the earth's orbit. If the earth is still in today's orbit, it will undoubtedly be swallowed up by the sun and buried in the vast sea of fire of the sun.

However, there is another astronomical phenomenon that is more terrible than the sun becoming a red giant, and that is the helium flash of the sun. The solar helium flash burst time is very short. At that moment, the sun will release the energy equivalent to nuclear fusion millions of years later. If the earth is still at today's distance, the ocean on the surface of the earth will boil and evaporate, the ground will burn into glass, and the whole earth will become a fireball, which is no longer suitable for life. Therefore, life on earth should avoid the helium flash of the sun, instead of the sun becoming a red giant.

One solution to wandering the earth is to install engines on the earth, but this is a relatively low-level cognition under modern civilization. At that stage of the development of the sun red giant, the scientific level of human beings has been doubled, and the origin of physics and the universe has been cracked. Earth's orbit can be changed by controlling gravity or stretching and compressing space.

Another way is to immigrate to these satellites, such as Enceladus or Europa. The sun expands, and the temperatures of cold Jupiter and Saturn rise, which is suitable for living things!

After the star is formed, a nuclear fusion reaction takes place in the high-heat and high-density core, and hydrogen atoms are converted into helium to generate energy. The star at this stage is located in the main sequence region mainly because of its mass, chemical composition or other factors. All the main sequence stars are in hydrostatic equilibrium, and the hot pressure caused by the outward expansion of the hot core is in equilibrium with the pressure caused by the inward collapse of gravity. Core temperature and pressure have a strong correlation with productivity, which helps to maintain balance. The energy generated by the core is transmitted to the surface and radiated through the photosphere. Energy is transferred by radiation or convection, which will produce temperature gradient, higher opacity or both in this area. Therefore, the light radiated at this temperature has the possibility of spectral study.

Two astrophysicists, Ejnar Hertzsprung and henry norris russell, put forward the famous Herodotus. They found an interesting phenomenon. The main sequence stars on the Herro diagram can show the evolution process of stars. They are distributed from the upper left corner to the lower right corner and are also called stars in the main sequence zone. Because the sun is just on the main sequence star belt, it is the main sequence star now.