At this time the sun will be relatively stable and not collapse again, this is called the main stages in its life. The main stage will last for about 10 billion years before the sun passed through the period of old age. During the main phase, in addition to hydrostatic equilibrium, it also achieve thermal equilibrium: Energy from the Sun center passed out of the surface and the radiation in the universe completely. Compared with the period of the Sun's brightness money it has increased 30% as we see now, that ensures the evolution and maintenance of life on Earth. If the number is larger or smaller, we can not exist or the world falls into an ice age.
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