Introduction to interstellar migration

Interstellar migration will provide settlement space for billions of people born in the future. Marshall T. Savage predicted in the Millennium Plan that the asteroid belt could accommodate 7,500 trillion inhabitants. According to the current population growth rate, the earth's population density will reach saturation around 1440. However, interstellar migration also faces many problems. For example, our body structure is not suitable for staying in space for a long time. If we stay on the surface of Venus, we will be melted; if we stay on the surface of Mars, we will be frozen. The only way is evolution.

In the research report published in April this year, anthropologist Smith believed that the estimated time of interstellar travel reached 150 years, which was basically consistent with the Icarus plan proposed by non-profit organizations to go to the nearest star in the solar system. According to Smith's calculation, the initial number of immigrants must reach at least 6.5438+0.4 million, and the number ranges from 6.5438+0.4 million to 44,000. This is a simulation result based on the theory of human population genetics, of which 23,000 are men and women of childbearing age.

Smith admits that this number seems huge, but we need to maintain a certain number, because a large number of groups can avoid inbreeding and solve the problem that early immigrants feel depressed in the group. In fact, according to Smith's survey, the number of vertebrates should be at least 5,000 to 7,000 individuals. If they want to survive, they must maintain this basic population to avoid extinction. Even if we have thousands of immigrants, we still need to freeze sperm and eggs to maintain the superiority of the group.