World Earth Day
April 22 is a day to remember for all. That is the World Earth Day, the earth is the home of hundreds of millions of human beings and even the earth, it seems so special in the universe, because once you leave this planet, it is difficult for human beings to find a second new home in the universe.
The lifespan of the Earth
Life originated on Earth, and of course may end on Earth. With the advancement of the national science popularization work, we now know that the earth is a planet with a history of 4.5 billion years, so how long can it continue to survive in the future?
Wang Jiyang, an academician of the Chinese Academy of Sciences, once said in a program: If I ask you how old the earth is now, everyone can definitely answer that it is between 4.5 billion and 4.6 billion years old, but if I ask you, how many more years can the earth live?
4.5 billion years later
In fact, the earth can live for another 4.5 billion years. This means that if humanity can survive in the future, 4.5 billion years from now, we will still be able to see a planet full of life. But is this really the case? Throughout the history of the earth, in this long 4.5 billion years of history, the earth has appeared from generation to generation of hegemons.
Their emergence, prosperity, and final extinction are all in a unified stage. Compared with any previous overlord of the earth, the existence of this species of human beings is not worth mentioning, from the excavation of ancient civilizations, scientists have found that the history of human beings on the earth has reached 3 million years.
Rulers of the past
This time seems to be very long, but compared with the dinosaurs that dominated the earth for nearly 200 million years, it is still not enough to see, if you don't believe it, you can divide 200 million by 3 million to calculate the result. Of course, unlike the overlords on the earth, human beings have created brilliant civilizations and powerful weapons in a short period of time.
If the emergence of a new species will replace the existing species, it is a cycle of life on Earth. But any creature on Earth that wants to replace humans is almost impossible to achieve. Of course, if these creatures secretly develop more advanced technology than humans, they may easily replace humans.
Energy crisis
In fact, what Academician Wang Jiyang expressed is not how long the earth can survive, but the life of the energy on the earth. As we all know, planets have no lifespan, the moment they are born, their life is destined to be a miracle, lucky planets may survive to the end of the universe, of course, unlucky planets, may appear not long ago, they are swallowed up by other celestial bodies.
But energy is different, and energy determines the progress of civilization. With the development of science and technology, we need more and more energy, energy development so far, mainly based on fossil energy and natural energy, of course, in order to be able to be based on artificial energy, remember is the future!
Natural energy
Among them, fossil energy, such as natural gas, oil, coal, which are stored on the earth, while natural energy comes from the sun, wind, water, geothermal heat, etc., and artificial energy is controlled nuclear fusion.
At present, it will take a long time for human beings to reach the stage of controlled nuclear fusion, and solar, wind, and hydropower will also produce huge energy, but compared to geothermal energy, their energy is too small.
The earth under our feet, 10 kilometers underground, is the boundary of the representation, that is, the crust, under the crust is the mantle composed of flowing lava, and below the mantle is the core core of the earth. The temperature there was very high, higher than the surface temperature of the sun, and under the deadly heat and the enormous pressure, the energy was far and continuous from the ground.
Powerful geothermal energy
Say geothermal energy you do not understand, earthquakes, volcanic eruptions you should know to put. Yes, this is a form of geothermal energy release, and the scene of geothermal energy application is also diverse, which can meet a large number of daily needs of human civilization, and most importantly, as long as the earth is constantly rotating, then geothermal energy can be inexhaustible.
This article summarizes
But can human beings really live to 4.5 billion years, you know that in another 8 billion years, our sun will expand into a red giant star, when the sun was 100 times larger than the current sky, and its huge size can directly swallow Mercury and Venus.
And at that time, the last drop of water on the earth will also be evaporated, and the temperature on the surface will be as high as hundreds of degrees Celsius, and no life will survive. Where were the humans of that time?