The sun and the life of the earth

The sun and the life of the earth

The sun is the source of energy on the earth. It can be said that all the energy on the earth comes from the sun. Without the sun, life will no longer exist, and the earth will be dead and lifeless

What is the life span of the sun and the earth?

The earth's current life span is 4.6 billion years. As for how long the earth will exist in the future, it is still unknown. Here are the reference materials
How long is the life of the earth?
It is estimated that the earth has lived for 4.6 billion years. But how long can it live?
Scientists believe that if the earth is allowed to run freely, it may exist forever, but if other external factors interfere with it, the earth may die
In other words, all the energy and power on the earth come from the sun. Once the sun is short, it is bound to harm the earth. Before the 1930s, people always thought that the sun would burn out one day, turn from white to orange, then turn red, and finally turn into a silent dark star, In the 1930s, when physicists learned the mystery of the sun's glow and heat, the situation was very different. It turned out that the sun's energy came from its thermonuclear reaction, The life of the sun will go through the stages of gravitational contraction, main sequence star, red giant star and compact star. The main sequence star stage is the stable stage of the sun. This stage will last 10 billion years. At present, the sun only spends half of its time and is in its middle age. Once the sun reaches the stage of red giant star, the end of the earth will come. Of course, it will be billions of years later
Apart from the sun's interference with the earth, are there any other factors? Some scientists believe that the sun may have a brother, a companion star of the sun, which keeps circling the sun day and night. Every 26 million years, it will turn to the nearest place to the sun to "make waves and wind". Its strong gravity will cause great disturbance to many comets. One billion comets will collide in the solar system, The earth and other planets will become the "target" of these comets. If the mass of the comet colliding with the earth is large enough, the consequences will be unimaginable: the light ones will die out, and the ecology will change dramatically; the heavy ones will fall apart, and the earth will be "shattered". However, this sun companion that may bring accidents to the earth has not been found, but many scientists believe it exists

What is the relationship between life on earth and the sun

Without the sun, there would be no light on the earth. Without light on the earth, there would be no way to synthesize organic matter. Without organic matter, there would be no way for life
In fact, the most important reason is that without the sun, the temperature on the earth would be below - 250 degrees, and almost all things exist in solid state. The existence of life must have something in liquid state. We now know that all life is inseparable from water, but not ice. Therefore, without the sun, there would be no life on the earth