I want to ask, will the sun be the same in 3 billion years? Will there be life on the earth?

The sun 3 billion years ago, the sun 3 billion years later and the sun now are all one sun. Only 3 billion years ago, the sun was still a vibrant teenager. After 3 billion years, the sun has become slightly old.

Let's look at the life of the sun. Now the sun is about 4.6 billion years old. About 4.6 billion years ago, the sun was formed by a collapsed nebula. Scientists estimate that the life of the sun is about 1 10 billion years, in which the time of the sun on the main sequence belt is about 10 billion years. In 5 billion years, the sun will become a red giant. Now the sun is like the middle age of human beings, in a relatively stable period.

Illustration: The Sun

The evolution of the sun directly determines the fate of planets including the earth. The brightness of the sun has been increasing since its birth. The brightness will increase by 10% every10 billion years. As the brightness of the sun increases, the surface temperature will also increase slowly. In the past 10 years, the brightness of the sun has been increasing. The temperature on the earth is affected by solar radiation, and the temperature is rising. This may be the reason why life on earth began to appear on land.

Illustration: During the evolution of stars, the brightness is increasing.

When the temperature of the earth rises gradually because of the brightness of the sun and life begins to flourish, Venus, which is closer to the sun, becomes too hot because of the brightness of the sun. The ocean on the surface of Venus disappeared because of the high temperature. In the next 1 100 million years, the brightness of the sun will continue to increase, and the surface temperature of the sun will continue to rise. At that time, the earth will follow in the footsteps of Venus, and the surface will become too hot. The oceans on the earth may evaporate and the biological areas on the earth will become extinct.

If scientists predict the rising speed of the sun's brightness, the sun's brightness will increase to 30% after 3 billion years. At that time, the temperature of the earth may become like Venus now. In that case, life on earth will definitely become extinct.

Illustration: In the future, if the temperature of the sun rises, life on earth will be extinct.

So life on earth may not have to wait until the sun becomes a red giant before it becomes extinct. If humans still existed at that time, Mars might be a good place to go. Because Mars at that time became much warmer than it is now because of the rising brightness of the sun.