For the sun, it has always been called the master of all things. It is precisely because of the role of the sun that organisms on the earth can survive and multiply. Sunlight, water and air are the three main factors for the survival of life on the earth, and none of them are indispensable! The sun is always shining and heating up. For the human beings living on the earth, it seems that they are used to all this! The state of the sun today is very good. It can be said that it is in the prime of life, with a lifespan of about 5 billion years. So now we don’t have to worry about the sun going out. However, we have to consider such a problem. If one day What will happen if the sun goes out? Or how long will we be able to feel it?
You know, it’s only a few million years since the birth of mankind, but the sun has a lifespan of 5 billion years, so for us today, we don’t need to worry about such a problem. But after all, this kind of thinking about danger in times of peace is better! The sun is about 150 million kilometers away from the earth. According to the propagation speed of light in a vacuum, it takes 8 minutes for the light of the sun to reach the earth. Therefore, many people think that the sun is really extinguished. Will human beings feel the darkness on the earth after 8 minutes? However, this is not the case. Scientists have suggested that such a period of time may take 100,000 years. So what is the reason?
The first thing we need to know is that the sun’s continuous glow and heat are mainly due to the light and heat formed by the internal nuclear fusion, but when the internal hydrogen element is exhausted, the sun will die at this time. There is no combustion reaction in the sun itself. Even though the process of nuclear fusion in the sun has stopped, its energy still continues to spread, and the propagation speed is very slow, which takes about 10,000 years. Space itself is a vacuum environment, so even if the sun stops responding, its temperature and light will not disappear immediately. It will take 10,000 years for the whole to cool down completely.
But you must know that there is a very deadly strong radiation in the sun. If the gamma-ray is directly irradiated on the human body, it will cause abnormal cell division, which will lead to cancer. And this situation is irreversible. If the sun ceases activity, some of these rays will be released immediately and their brightness is very strong, directly surpassing the sun’s rays. At this time, if they are directly transmitted to the earth, they will be harmful to people. Cause more damage with other creatures.
But know that the sun still needs to go through a long process before it faces death. For example, like a human, it may go through a stage of aging, from a star to a red giant. At this time, its mass is constantly changing, and the light emitted from the core area is also It began to shrink gradually, so it is still unknown whether the earth will still be present in the process of aging. Therefore, we may not be able to feel the day when the sun is completely extinguished with our own eyes, and there is no exact answer to a question like this. After the sun goes out, the time for humans to feel the last ray of light may not be 8 minutes or 10,000 years. In short, the time is not particularly certain.
In any case, the current sun still has this relatively long lifespan. We still have no way to predict what changes will happen to the earth and the sun in the future, so don’t worry about such a problem anymore.