Why can't humans migrate to other planets?

Human existence must meet five conditions: oxygen, water, food, suitable temperature and solid surface. The outer circle of the earth can be further divided into four basic circles: atmosphere, hydrosphere, biosphere and lithosphere, and the inner circle of the earth can be further divided into three basic circles: mantle circle, outer nuclear liquid circle and solid inner circle.

In addition, there is a asthenosphere between the outer and inner circles of the earth, which is the transition layer between the outer and inner circles of the earth and is located at an average depth of about 150 km below the ground. In this way, the whole earth contains eight spheres, in which the lithosphere, asthenosphere and the inner circle of the earth together constitute the so-called solid earth.

Only when another planet has the characteristics of the earth can human beings survive. So far, no other planet can meet all the above conditions, so humans can't move to other planets.

Extended data

What difficulties do humans need to overcome when they immigrate to another planet?

At the beginning of the 20th century, some people thought that Mars and Venus might be good choices, but NASA soon found that other planets around the sun were not suitable for our survival. People on the surface of Venus must live at a temperature high enough to melt lead. As for Mars, because of its low pressure, living on it is like living twice as high as Mount Everest.

2. According to the calculation, the nearest Alpha Centauri is about 4.23 light years away. If the space shuttle is at its current speed, it will take 158000 years to arrive. This requires the vehicle to reach the speed of light.

In fact, scientists are moving towards this goal. According to New Scientist magazine, the US Air Force and NASA are currently secretly studying a "hyperspace engine". It is said that scientists are expected to make a prototype of the "hyperspace engine" and test it within five years. Once the "hyperspace engine" is proved to be feasible, it only takes three hours from the earth to Mars, and it only takes 80 days from the earth to the planet with a distance of 1 1 light-year.

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