Let's travel back in time to 1989, when a smaller asteroid brushed shoulders with Earth, and experts analyzed that it collided with the force of 1,000 nuclear bombs - as it was launched at the beginning of the 19th century

Born in Siberia, the mysterious explosion of Tunguska. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ。。。。。 Even if the Earth's own resources had not been exhausted by humans, the solar system would have to grow around the galaxy and beyond

the change of 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 already begun to try to set up nuclear power plants and solar panel arrays on the moon

and hopes to use a variety of methods to extract carbon, silicon, aluminum, iron and other useful substances from the lunar surface. But the "White Cloud Knight" points out that the moon is also only a "primary parking station".

The moons of Jupiter and Saturn (Europa, Titan), Uranus and Neptune are thought to contain a lot of water, carbon and nitrogen and methane, among others, in the solar system

The closest star to Earth is Mars. "Mars is different from the Moon, it has a certain atmosphere, which can avoid direct radiation damage from cosmic rays, and has hundreds

Forty out of the Earth's gravitational pull. "So 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

Breathing, which can also 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 free-standing orbital habitat - construction

A city in space.

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 be generated

Gravity 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 spaceships and space elevators from Earth or other space cities can be used

This is the stop (-a.k.a. Space Terminal).

The necessities of life in the space city are completely self-sufficient. People can grow food and vegetables, raise livestock, open green factories, and recycle air and wastewater

Use. 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, it should be first

Development of the Moon. Scientists estimate that sending 200 people to the moon can mine more than one million tons of ore every year, and the ore will be ejected to a space smelter by magnetic emission, where it will be heated, smelted, and added using solar energy

Produce various building materials and components such as aluminum, carbon nanotubes, and glass, 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.

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