Life can be said to be the most mysterious thing in the world, how was life born? Now scientists are also actively looking for answers, according to Darwin's theory of evolution we can know that life on the earth is evolved from simple organisms, the earliest life on the earth should be born in the water, from single-celled organisms to multicellular organisms, from multicellular organisms to marine organisms, from marine organisms to amphibians, from amphibians to terrestrial organisms, human beings are evolved from terrestrial biological apes, although Darwin's theory of evolution is more recognized in the scientific community, But how was the first life on Earth born? Scientists don't have an accurate answer either.
Many scientists believe that the birth of life on earth may be related to comets, comets are also known as broom stars, because comets in the process of flight, always drag a long tail behind, so humans named it broom stars, so why say that earth life may come from comets? Scientists through research to conclude that the comet contains a lot of water resources and other elements, in the early solar system, the solar system is very chaotic, often there will be comets hitting the earth scene, although the comet impact on the earth caused great harm, but also to the earth to bring a lot of water resources, now we know that 71% of the earth is ocean, scientists believe that these water resources are brought by comets.
Water is the source of life, with water resources the earth can give birth to life, in a sense, life originated from comets is also a certain truth, according to Darwin's theory of evolution we can know that life from birth began to evolve continuously, in the long years of the earth 4.6 billion years, the creatures on the earth experienced a total of 5 biological mass extinctions, the first mass extinction is called the Ordovician mass extinction, occurred 440 million years ago, scientists have calculated that due to the sudden decline in the earth's climate at that time. This caused the sea to freeze completely, so many creatures perished, and this mass extinction event may be related to the Great Ice Age. The second mass extinction occurred 365 million years ago.
At that time, terrestrial life had evolved on the earth, and scientists speculated that the second mass extinction event may be related to the eruption of submarine volcanoes, a large number of submarine volcano eruptions, making the sea temperature rise rapidly, so many marine organisms have died. The third mass extinction occurred 250 million years ago, this mass extinction event is known as the Permian mass extinction, this biological mass extinction event is the most serious in the history of the earth, resulting in 96% of the organisms on the earth are extinct, scientists speculate that the third mass extinction event may be related to the movement of continental plates, the fourth mass extinction occurred 200 million years ago, scientists speculate, because the earth at that time was lush with trees and oxygen content.
Fires often occur, fires can not be extinguished in time, so many organisms have been burned to death, this mass extinction event caused 60 percent of the creatures on the earth to die, the fifth mass extinction occurred 65 million years ago, scientists speculate that this mass extinction event was caused by asteroid impact on the earth, we know that there are many asteroids in the solar system, there is an asteroid belt between Jupiter and Mars, and the orbit of the asteroid is very unstable. De-orbiting is often the case, and scientists speculate that 65 million years ago, an asteroid with a diameter of 10,000 meters hit the earth, causing 90 percent of the creatures on the earth to go extinct, when the overlord of the earth was the dinosaurs, who lived on the earth for 160 million years.
If it weren't for the asteroid hitting the earth, then the dinosaurs would have lived longer on the earth, and many people may have a question when they see it here, that is, is the power of the asteroid hitting the earth so great? On July 17, 1994, a comet called "Sumec-Leve 9" hit Jupiter, and scientists calculated that the diameter of the comet "Sumec-Levey 9" was about 2,000 meters, which was five times smaller than the asteroid that hit the Earth 65 million years ago, and the energy generated by the comet's impact on Jupiter was equivalent to the sum of the energy of the 40 trillion tons of TNT explosion, about 2 billion times that of the Hiroshima atomic bomb. It's hard to imagine how powerful it really is.
An asteroid with a diameter of 2,000 meters is already so powerful, not to mention that the asteroid that hit the earth 65 million years ago has a diameter of 10,000 meters, and we can know from the number that the asteroid that hit the earth 65 million years ago must be more powerful. However, the fifth biological mass extinction event has also brought opportunities to mankind, human beings were born after the fifth biological mass extinction, if the dinosaurs did not become extinct, then human beings may not be born, after the birth of human beings will continue to develop their own science and technology, after thousands of years of efforts, human beings have been able to go out of the earth to explore the universe, which shows that the speed of human scientific and technological development is still very fast, but human beings in the development of science and technology at the same time, but also caused serious pollution to the earth environment.
A large amount of carbon dioxide emissions into the air, resulting in the concentration of carbon dioxide in the earth's atmosphere is getting higher and higher, making the global greenhouse effect serious, now the earth's temperature is getting higher and higher, if the long-term development continues, then the glaciers of the Antarctic and the Arctic will all melt, scientists through calculations, if the glaciers of the Antarctic and the Arctic are all melted, it will lead to a sea level rise of more than 60 meters, when all coastal cities will be submerged, coastal cities flooding means that the land area will become smaller, At that time, humans may start wars for territory, in addition, a large amount of industrial wastewater, garbage, plastic bags are discharged into nature, so that the animals and plants in nature are also endangered.
From the overall point of view, this is a vicious circle of the process, the earth's environment is formed through hundreds of millions of years of changes in the earth, once the destruction in a short period of time is difficult to recover, if human beings do not pay attention to it in time, the future one day human beings will be because the earth's environment is too bad and perish, many people may see here will say, human beings can immigrate to other planets, although now scientists have found planets similar to the earth outside the solar system, but these planets are too far away from us, Human beings now even have no way to fly out of the solar system, let alone migrate to other planets, and the environment on other planets is not necessarily the same as that of Earth, if you want to achieve interstellar migration, you also need to transform the colonizing planets, and there is no way to do it with human technology now.
The earth is the homeland on which human beings live, human beings want to develop for a long time, they must protect the global environment, only the earth environment becomes better, human beings can always survive, Xiaobian believes that although the development of science and technology is very important, but we also need to protect the earth environment at the same time as developing science and technology, the earth is not only the home of human beings, but also the common home of other animals, plants, and marine life, human beings are not the only life for the earth, and the earth is now the only home for human beings. Therefore, the protection of the global environment is the most important. What do you want to say about this?