The earth has existed for about 4.6 billion years, as old as the sun and other planets in the solar system. Three billion years ago, the earth began to breed life; 200000 years ago, human beings finally stepped on the stage. The sun is the source of most of our light and heat. It has almost completed half of our life.
The sun keeps consuming hydrogen fuel, and the temperature keeps rising. In the end, the warming of stars will naturally turn the earth into a barren land. At present, the earth is still in the “habitable zone”, the temperature is not high or low, will not freeze the water, will not let the water boil. When scientists studied the destruction of the earth, they divided the destruction of the earth into four stages, but now, it seems to be in the first stage.
In the next billion years, the earth will gradually approach the edge of the habitable zone, and global warming will add fuel to the fire. A large number of sea water will evaporate, ice will melt, and water vapor will enter the atmosphere, making the situation worse. From this time, the earth will begin to be destroyed.
Light green represents the broad sense of habitable zone, dark green represents the narrow sense
In the second half of life, the sun began to expand and expand, and the earth’s surface temperature continued to rise. In hundreds of millions of years, the rocks were hot and red, and the temperature of sea water reached 80 ℃. There would be no life in most parts of the earth. Behind this lies a disappointing fact: three quarters of the life journey of the earth has been completed. If you just know the news, you may need to sit down and calm down.
The third stage:
Before the end, life will still show a strong desire to survive. Maybe you think that the organisms at this time may undergo some kind of evolution, and then adapt to the present environment. However, any living creature at this stage is in fact very difficult.
The fourth stage:
At the end of the day, it turns out, as expected, that extinction will prevail. But we don’t need to see this as the end of the universe.
We assume that the earth is not unique, and that intelligent organisms are ubiquitous in the universe. The sun will not be the last planet suitable for human habitation. Recently, NASA’s Kepler space telescope found that there may be as many as 1 billion earth like planets in the Milky way (maybe more, Americans like conservative estimates), and countless civilizations still have enough time to experience ups and downs.