How long will it take to immigrate to a new planet to develop to the level of the existing human society?

Under the condition of the topic, I will enrich the model of the new world: a planet of Eden, with plenty of water, flat terrain, few earthquakes and volcanoes, ordinary mineral resources, mild climate, warm in winter and cool in summer. The biosphere is huge and simple. There are no species that threaten human beings, such as grass, trees, chickens, eagles, mushrooms, etc., and germs are not pathogenic to human beings. Under the circumstances, I want to enrich the human situation: the earth is close to destruction. In order to continue human civilization, thousands of colonial spacecraft flew to the known planet. The target of the spaceship 12306 is the Garden of Eden. The number of passengers was 10000, and the age ranged from 15-30. A small number of old people aged 40-60 were destroyed when the spacecraft entered the atmosphere of Eden. The story begins. 2. Solve the problems of housing, food and drinking water. Because the conditions on this planet are not bad, it will be solved soon. 3. Establish social ideology, political structure and division of tasks. The ultimate goal: to avoid war and rebuild the earth civilization. 4. Due to the damage of scientific instruments, computers, storage devices and tools. There is a fault in human knowledge, and the knowledge of the human brain is limited and constantly forgotten. The urgent task at present is to record knowledge. 5. Have more children, plant more trees, and concentrate on doing great things. Oracle Bone Inscriptions appeared, the first periodic table appeared, murals appeared, natural science and technology trees appeared, and simple timers appeared. Farmers and other occupations have flourished. Rough paper is made. The wind of publishing books is prevalent. Recorded a lot of knowledge. The plane appeared (don't ask me why). The map appeared. A new religion has emerged. The newborn was born. Five years. Recover the metal wreckage of the spacecraft. The first magnifying glass. The first astronomical telescope. The first crude microscope. The mine began to operate. Breakthrough has been made in theoretical physics (the tree of science and technology is wrong). Bricks and tiles first appeared. The microscope is broken, so you are in such a hurry to make glass. ) Brick houses began to spread. Bronzes began to be widely used. The first light (is it appropriate to steam first? Education reform: improve the education system. In kindergarten, primary school and junior high school 10, the steam engine was reformed, the mining industry flourished, universities appeared, the third generation was born in 20 years, an old man died, ironware was developed, steel was developed, crude timers appeared, cities appeared, history museums appeared, simple means of transportation appeared, Scientific Outlook on Development proposed afforestation, steam engines were developed, and cars were developed. The popularization of scientific research, the signing of the anti-nuclear declaration, the appearance of early computers, the emergence of the Internet, the peaceful use of nuclear energy, and the launch of the first man-made satellite by human beings. 100 years, from the crash of the spacecraft to a full hundred years, the fire on the spacecraft remained for a hundred years, symbolizing the fire of human civilization in the new world, which will burn forever. One day in 20 14, the astronauts in Eden received a signal from deep space and actually used the same coding rules as them. This is the human civilization from the descendants of other colonial ships. Listen to the next decomposition. Peace will greatly shorten the time for pursuing civilization. With a complete science and technology tree, you don't have to cross the river by feeling the stones, you just need to spend time lighting them one by one. Everyone yearns for future civilization and technology because of the present situation. Due to previous knowledge reserves, some technologies may not appear in historical order. Question about productivity: What will happen when there are only 10% people left on the earth? On the number of people: How many people does it take to rebuild the whole human civilization? Question about this brother: If human civilization is destroyed, all the existing modern technologies will disappear, leaving only a small number of people. Can they recover to the present level of civilization by wisdom? In my opinion, the same is to catch up with civilization, one is hope, the other is trauma, the other is to thrive in new soil, and the other is to crawl on ruins. Therefore, I hope that mankind will cherish the glory of civilization and not do stupid things. Is there anything else to add? I hope everyone can brainstorm. Personal ability is limited. Show all