BIGBANG formed its solar system about 5 billion years ago and 4.6 billion years ago. There are nine planets in the solar system. There are two kinds of planets: water, earth, fire, wood, earth and sea. One is that sun-like planets are mainly composed of a single element "hydrogen", including wood, earth, sky and sea. The other is that terrestrial planets are made up of various minerals. The conditions of the earth are unique, not far from the sun, the temperature is suitable, there is a thick atmosphere, the main component is nitrogen (N), and there is a large area of ocean. Only the rotation and revolution of the earth will produce the atmospheric circulation of day and night seasons and wind, rain and lightning. Volcanic activity is frequent, and orogeny is constantly going on. At the same time, there is a satellite moon to slow down the occurrence of geological disasters. Only when all the conditions in the world are met can the earth have today's scene. (-—NH2) and carbohydrates are the basic conditions for the formation of life. Lightning and a large amount of nitrogen are the basic elements for the formation of amino acids. Amino acids and carbohydrates and minerals in the ocean form more complex organic substances until the most primitive life appeared about 3.8 billion years ago. Primitive life avoided the harm of ultraviolet rays in the ocean, and through continuous photosynthesis, it slowly recuperated and produced a lot of oxygen. The oxygen-like ozone layer shields a lot of ultraviolet rays, creating conditions for creatures to land from the ocean. The earth's rotation caused the collision between plates to form orogeny. The orogeny, combined with rainfall and glacial meltwater, formed rivers and lakes. With rivers and lakes, life in the ocean can penetrate into every corner of the earth. At the same time, the interaction between the moon and the earth slows down the rotation speed of the earth and reduces the frequent movements of earthquakes and volcanoes. In ancient times, the moon was closer to the earth than it is now. With the revolution, it keeps moving away. Now it looks about the same as the diameter of the sun, and it reaches a balance, which provides a guarantee for the later development of life, landing from the ocean to the land. Life began to flourish and evolve at a high speed, from single cell to multi-cell, from plants to animals to humans. The time spent is getting shorter and shorter. Algae appeared about 2.5 billion years ago, invertebrates appeared 600 million years ago, fish and terrestrial spore plants appeared 400 million years ago, amphibians appeared 330 million years ago, reptiles and gymnosperms appeared 250 million years ago, dinosaurs died out 70 million years ago, and mammals became the protagonists of the earth. Primitive apes appeared about 5 million years ago, humans entered the Paleolithic Age about 200,000 years ago, and the first Xia Dynasty appeared in China about 2 1 century BC ... The beautiful, unique and lovely earth can only develop better if it continues to maintain its diversity and uniqueness (personal summary, by no means an excerpt).