Back in 1989, a smaller asteroid passed by the Earth, and experts analyzed that it collided with the equivalent of 1,000 nuclear bombs – such as the mysterious Tunguska explosion in Siberia at the beginning of the 19th century. Pen ~ Fun ~ Pavilion www.biquge.info。。。。。

Even if the Earth's own resources are not exhausted by humans, the solar system orbits the Milky Way and the larger outer stellar system - it will go through a great cycle of four seasons; Oakley Ford, the head of NASA, declared: "If humanity wants to survive for a million or tens of millions of years, we have to move to other planets." ”

Yes, human beings go to other planets to survive, not like we usually go to relatives and leave.

First of all, choose the right habitable planet. After 2050, a human space colony was set on the moon. They have begun experimenting with nuclear power plants, solar panel arrays, and hope to use a variety of methods to extract carbon, silicon, aluminum, iron, and other useful substances from the moon's surface. But the "White Cloud Knight" points out that the moon is also only a "primary parking station".

Uranus and Neptune are believed to contain a lot of water, carbon, nitrogen and methane, and the closest star to Earth in the solar system is Mars.

"Mars is different from the moon in that it has a certain atmosphere that avoids direct radiation damage from cosmic rays and has 40 percent of the Earth's gravitational effect," said Ling Xiao, a Martian from the space agency. ”

Therefore, we humans can use the underground ice on Mars to "reclaim" Mars, first to create a thin layer of ocean, and then to create an atmosphere for humans to breathe, and also to block the damage of cosmic rays.

However, a "future home" must be built before you can consider moving. American astrophysicist Johnson proposed the idea of a supermassive independent orbital habitat - to build a space city.

This cylindrical city is 37 kilometers long and 6 or 8 kilometers in diameter, and can accommodate more than 100,000 people. It is fully enclosed and rotates once per minute with the central axis as the axis of rotation, so it can generate gravity of the same size as the earth's surface. The inner wall of the cylinder is exactly the ground of the city. There is also a space dock at the top of the cylinder, where ships and space elevators from Earth or other space cities can dock (aka Space Terminal).

The necessities of life in the space city are completely self-sufficient. People can grow food and vegetables here, raise livestock, open green factories, and recycle air and wastewater. The only reliance on the ecological environment system of the space city is still the sun. But to build this space city, at least millions of tons of building materials need to be taken from the moon or asteroids near the Earth. Therefore, before building a space city, the moon should be developed. Scientists estimate that sending 200 people to the moon can mine more than one million tons of ore every year, eject the ore to the space smelter by magnetic emission, use solar energy to heat, smelt and process it into various building materials and components such as aluminum, carbon nanotubes, glass, etc., and then send a group of space robots to orbit to carry out high-altitude operations, and then you can start assembling and building a space city。。。。。。