If humans get energy from red giant stars, what advantages do they have compared with the sun?

The sun is actually not the most ideal energy source for the earth, because of its? Life span? It is too short. After about 1 100 million to 2 billion years, the sun will gradually get bigger and hotter, and the earth will get hotter as the sun gets bigger, so the temperature will start to rise. Until a critical value is reached, the environment of the earth will no longer be suitable for human habitation.

If humans still existed at that time, they would face two consequences. First, human beings have realized interstellar migration and discovered new life planets; The second kind will go extinct like most species on earth and become insignificant dust in the evolutionary history of the universe.

In about 5 billion years, the sun will come to the end of its life and become a white dwarf. The white dwarf sun can no longer provide energy for the solar system, and the pattern of the whole solar system will change dramatically, and the earth may no longer exist.

In the whole universe, there are countless stars, and their lifetimes are different because of their different masses. Our sun is a yellow dwarf, and its life span is about 65.438+0 billion years, so the planets around the sun have only 65.438+0 billion years of energy at most.

This also includes the early sun and the late red giant sun, and the life of the earth's biosphere also depends on the stable energy irradiation of the sun. After about 654.38 billion to 2 billion years, the temperature of the sun will increase greatly, and the energy irradiated on the earth will also increase.

So the temperature of the earth will also rise, which is no longer suitable for survival. In other words, human beings must escape from the solar system and find a new life planet around 1 billion to 2 billion years. In the universe, there are stars bigger than the sun, and their life span is only about 654.38+0 billion years.

If there is a life planet around, the life of this life planet will be quite short. In fact, in the whole universe, there is a kind of star that is very suitable for the evolution of life. It is a red dwarf star. This is a dwarf with a low surface temperature and a red color. Its mass is no more than half that of the sun. In our galaxy, 70% stars are red dwarfs.

The nearest star, proxima centauri, is a red dwarf, so why is the red dwarf the last hope of mankind?

This is because red dwarfs are relatively stable and have a long life. Unlike stars such as yellow dwarf and blue giant, the internal nuclear fusion of red dwarf is mild, and its mass just ignites the internal nuclear fusion. Therefore, although its mass is much less than that of stars like the sun and Vega, it can burn for a very long time, from tens of billions to trillions of years.

The age of our universe today is only about 654.38+03.8 billion years. Therefore, among many stars in the universe, the sun has entered the middle age stage and will die out in about 5 billion years. However, red dwarfs in the universe, like childhood humans, still have a very long time. Such a long life span enables red dwarfs to provide a stable energy and environment for a planet for a long time.

And the life living on this planet can have a longer time to reproduce and obtain a relatively long and stable life evolution period. Therefore, in the whole universe, red dwarfs are the most suitable energy sources for planetary life.

So, does this mean that humans will follow the death of the sun? Of course not. According to the current science and technology of mankind, 65.438+0 billion years is enough for mankind to find another life planet, and in 65.438+0 billion years, mankind may not die with the sun, but on himself.

As for how long human beings can reproduce and whether they can follow the universe to the end of the universe, our generation will never know.