2020-07-09

If there is no accident, how long can humans exist on earth? Is this answer acceptable?

By yqqlm yqqlm
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​2.4 million years ago, energy has appeared on the ancient African land Man, this is the first creature that can be called human. After more than two million years of evolution, Nengren has differentiated a variety of prehistoric humans, including Homo erectus, Heidelberg, and Nepal Anders.

By 250,000 years ago, Homo sapiens evolved. Homo sapiens finally survived the brutal competition for survival and became the only species in the genus. Nowadays, humans on earth are considered to be descendants of Homo sapiens.

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That is to say, humans have survived 240 on the earth Ten thousand years. If there is no accident, how long can humans survive on earth?

As early as 4 billion years ago, it is likely that life has evolved on the earth. In the past billions of years, life on earth has not been interrupted. But no species can always exist on the earth. With the continuous change of climate and environment, the organisms on the earth have changed from one crop to another. The number of existing earth species only accounts for 1%of the existing ones.

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Few species can exist on the earth for hundreds of millions of years Even if they are as strong as dinosaurs (non-birds), they have dominated the earth for 140 million years, and eventually disappeared into the long river of the earth 65 million years ago. At present, there are not many creatures that have existed for more than 100 million years, including 120 million years of”Mars” ants, 200 million years of sturgeon, and 360 million years of Lamprey, the horseshoe crab of 450 million years, the jellyfish of 500 million years, the oldest is the sponge of 760 million years.

The reason why few species can exist for a long time is because the earth’s ecosystem is constantly changing, and organisms that cannot adapt to environmental changes will be gradually eliminated. Especially when some drastic changes occur, such as large-scale eruptions of super volcanoes, giant asteroids hitting the earth, gamma-ray bursts bombarding the earth, these The event will make the earth’s ecosystem drastically change, leading to the extinction of a large number of species, which has happened 5 times on the earth. In addition, there have been dozens of smaller extinction incidents.

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After each mass extinction event, species on Earth will Perform a major blood exchange to replace the old species with new ones. A few surviving species quickly occupied the previous niche, and thus gradually evolved new species. Although there is never a shortage of creatures on the earth, there are very few creatures that can survive.

So, after the earth’s ecosystem continues to change, will humans be eliminated in the future because they cannot adapt to change?

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The biggest difference between humans and other living things is that we have wisdom , We can make tools. Although the human condition is not good, running slowly, unable to fly, and unable to survive in the water, but humans can invent a series of tools, which can allow us to go to heaven and even fly to earth creatures that have never been before Space and alien planets.

In just over two million years, we have become the dominant species on the earth, and it can be said that this is the contribution of human wisdom. No matter how the environment of the earth changes in the future, I believe that mankind has a way to deal with it. As long as there is no sudden upheaval, mankind can survive on the earth forever.

The sun out of moths

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In the future, the only thing that will surely bring major changes to the earth’s environment is the sun. The core of the sun is constantly undergoing a nuclear fusion reaction from hydrogen to helium. As heavier helium accumulates in the core of the sun, the gravitational collapse effect inside the sun becomes stronger and stronger, which accelerates the rate of nuclear fusion reactions.

As time goes on, the sun produces more and more energy per second, which means that the sun will get hotter and hotter. It is estimated that after 1.1 billion years, the solar radiation power will increase by 10%. The strong solar radiation will increase the temperature of the earth’s surface to 70 ℃, causing the liquid water to gradually evaporate.

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There is still much time left for humans. At that time, after 1 billion years of development, it is believed that mankind already has a response, such as pushing the earth away from the sun; or creating a huge”parasol” for the earth; or leaving the earth and going to other livable systems. planet.