Wandering earth 2 weather

The sun is the source of life on earth. Without the sun, the earth would be a death star. In The Wandering Earth, human beings regard the whole earth as a spaceship and go directly to find another sun.

Without the sun, what problems will mankind face?

I. Food shortage

Plants need photosynthesis. Without light, all crops cannot grow normally. Someone may want to use artificial light, isn't it? Even without the sun, there is light in the greenhouse, so it can grow. But this requires a lasting and huge energy supply.

Second, extremely cold weather.

The extinction of species on the earth has an ice age. Without the sun's irradiation, the temperature of the earth will drop to MINUS 200 degrees. Such cold weather will be devastating to human beings.

Although the earth has been wrapped in thick ice many times in geological history, many creatures can escape the catastrophe. But this time it was completely different, because although there were ice packs before, there was still sunshine at that time, and the temperature would not be too low. And if there is no sun, it will be as simple as a thick layer of ice on the surface of the ocean, and then the whole earth's ocean will be completely frozen.

What about geothermal? Isn't there geothermal heat? How can you freeze completely at once? The temperature of the core is 5000 degrees Celsius? The closer you get to the core, the hotter it gets, but because the surface is too far away from the core, thousands of kilometers, the heat transferred to the surface is very small, and people simply can't feel it.

Third, lack of oxygen.

In fact, this question is related to the last one. Below minus 200 degrees Celsius, many gases will liquefy or solidify. What's going on here?

In fact, any gas will have the temperature of liquefaction or solidification, just like the three States of water. The liquefaction temperature of oxygen is-183 degrees. In the standard state, oxygen turns into light blue liquid at-183 degrees Celsius, that is, it is liquefied; At about -2 18 degrees Celsius, it turns into a light blue solid like snowflake, which is solidified. Regardless of whether there is any change in the air composition on the earth without the sun, the liquefaction or solidification of oxygen alone makes there no oxygen in the air.

In fact, not only oxygen, carbon dioxide and other gases solidify early, but carbon dioxide directly becomes solid without liquid phase at atmospheric pressure, and the temperature is -78.3 degrees. That is to say, without the sun, there would be no atmosphere on the earth, and without air, human beings could not survive.