If the possible life span of the earth is reduced to1000 billion years, let's take a look at the life course of the earth.
From 0 to 5 years old, the earth is often hit by friends. The temperature of the impact point is as high as 16000℃. Metals such as iron and nickel melt and sink into the center, and some substances evaporate, forming the original atmosphere of the earth, of which 80% is water vapor and the rest is carbon monoxide and nitrogen. The atmosphere with water vapor as the main component caused a strong greenhouse effect, which soon made the temperature of the whole earth reach 12000℃, and the rocks melted, forming a magma sea on the earth's surface. The magma sea in turn controls the greenhouse effect and keeps the earth's temperature at a certain level.
Once, a partner half the diameter of the earth crashed into the earth from an oblique thorn, smashing a part of the earth to pieces. Later, some fragments fell back to the earth, while others were assembled into the moon.
After the earth grew up, the number of partners who hit her decreased, the temperature gradually decreased, the surface magma cooled into the crust, and the water vapor in the primitive atmosphere condensed into water and landed on the earth's surface, forming primitive oceans and rivers. At the same time, the ultraviolet radiation of the sun decomposes water vapor in the upper atmosphere into oxygen and hydrogen. Hydrogen escapes into space, while oxygen stays in the atmosphere.
At the age of 5-7, protein and nucleic acid gradually formed in the primitive ocean, and each developed its own self-replication mechanism. Soon, protein and nucleic acid combined and coexisted, and primitive life was born.
7-27 years old, primitive life develops in the ocean. At the same time, due to the plate movement of the crust and mantle, by the age of 27, a huge "Pangu continent" was formed (it is believed that some metals poured out of the ground due to the upwelling of the mantle, forming metal deposits).
At the age of 27-40, life forms gradually evolved, and supercontinents came and went.
40-40.5 years old; Ediacara biota, regarded as animals, appeared in the ocean, but died for some reason.
From 40.5 to 42 years old, the number of multicellular organisms increased explosively, and Bajie shale fauna was born, but it was extinct before 4 1 year old. The earliest vertebrate-primitive fish was born before 4 1.2 years old.
Because the plants in the ocean constantly release oxygen, oxygen molecules generate ozone under the action of solar ultraviolet rays, forming an ozone layer in the upper atmosphere, blocking solar ultraviolet rays from irradiating the ground, making the mainland a new world where life can survive and develop. At the same time, due to the increasingly fierce competition for the survival of plants in the ocean, marine plants landed first when the earth was 4 1 year old, and then propagated rapidly, ruling the earth and making it green.
Planets (it is believed that due to changes in the earth's crust, a large number of plants are buried underground and become coal resources).
42-43 years old, insects land behind plants. Some fish and amphibian vertebrates also changed from gill breathing to lung breathing, and developed to the mainland through rivers before the earth was 42.4 years old. Some amphibians evolved into reptiles.
From the age of 43 to 44, mammals and reptiles appeared before the age of 43.5, but except for one branch that evolved into mammals (similar to mice), the rest were almost extinct due to volcanic activity before the age of 43.65. At the same time, 96% of marine invertebrates are also affected by volcanic activity and die (it is believed that a large number of animal carcasses buried underground due to volcanic eruption and crustal changes form the earth's oil resources).
Dinosaurs appeared at about 43.82 years old and then multiplied in large numbers.
44-45 years old is the age when dinosaurs ruled the earth. There are herbivorous dinosaurs with a total length of more than 20 meters and carnivorous dinosaurs with a length of 12 meters on land. There are long-necked dragons, ichthyosaurs and pterosaurs in the sea. Dinosaurs ruled the earth for the longest time.
45-45.5 years old, not long before 45.45 years old, the earth was violently hit by asteroids or comets, which led to drastic changes in the environment, that is, a "impact winter" of about 3 seconds was formed, which made dinosaurs extinct. At the same time, 70% of species are extinct.
Fortunately, burrowing and nocturnal mammals survived the "impact winter" and then multiplied. Mammals that moved to trees became primitive primates, similar to squirrels.
45.5- Now.
Before the age of 45.52, in North America, which was connected with Europe at that time, a fake bear monkey evolved into the earliest ape, which looked like a big pig.
45.95 years ago, about 18 days ago, the Lamida ape-man in North Africa developed independently from chimpanzees and then walked upright, which became a great difference from other apes.
More than nine days ago, African homo habilis began to make "second-class tools", tore apart carrion, took out bone marrow and became homo erectus.
Six days ago, Homo erectus began to use fire to resist predators. At the same time, fire was used for lighting, heating and cooking food at night.
Four days ago, Homo erectus began to migrate from Africa to Europe, Asia and America.
4- 1 hour ago, Homo sapiens began hunting with javelins and bows and arrows, and painted murals with mud to make statues of bison and other animals.
42 minutes ago, humans began to sow seeds, so they began to settle down.
Twenty-two minutes ago, humans began to smelt copper, and then began to make iron. Then, commercial activities such as material exchange began, and cities emerged as commercial, political, religious and military centers.
12 minutes ago, the people of China began to build the Great Wall of Wan Li. Seven minutes ago, China people dug the Beijing-Hangzhou Grand Canal. Two and a half minutes ago, the Portuguese sailed around the earth. Half a minute ago, mankind developed aviation and flew into the blue sky by balloon, airship and plane.
In the last two minutes, although human science and technology have developed rapidly, the population has doubled. Less than 1 second ago, the total population of the earth has exceeded 6 billion.
Tsiolkovsky, the founder of space navigation theory, said that the earth is the cradle of human beings, but human beings will not live in the cradle forever. At first, they will cross the atmosphere carefully, and then they will conquer the whole solar system. Yes, man can leave the earth one day, but it will never happen in a few seconds or minutes.