What would the earth be like without the sun? Can humans survive?

The sun rises and sets every day, bringing sunshine and warmth to the earth. What would the earth be like without the sun? At the present level of science and technology, can human beings still exist? If there is no sun, it is obvious that there will be no sunlight shining on the earth. Then in order to become a frozen planet, all biological species can't survive, and of course humans will die on a large scale. This is the most direct impact, because as long as there is no sunlight, all living things on the earth will become extinct.

? What will happen without the sun? First, without the sun, there would be no light. At that time, there will be no day and night on the whole earth. At the same time, the surface temperature will drop sharply. As time goes on, it may eventually drop to about MINUS 240 degrees Celsius. Obviously, in such an environment, the earth will no longer be suitable for human beings, including every living thing on the earth.

In fact, after the surface temperature drops, we humans can use coal or nuclear power for heating for a short time, but these resources will be used up one day. When the resources are used up, the end of mankind will still be extinct. Secondly, the essence of food consumed by human beings still depends on sunlight. Plants are producers, and photosynthesis is carried out through sunlight. Then low-level consumers (herbivores) get energy by eating plants.

Hypoxia is actually related to the last question. 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 becomes a light blue liquid at the temperature of-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.

In the face of nature, human beings are very small. With the development of science and technology, intelligent human beings will explore and prepare for future survival and development. Even if there are several years of disasters on the earth, human beings can continue to survive. However, nature is ever-changing and unpredictable. In case of a sudden disaster, we may be caught off guard. So at this time, we should always protect the only home and make the earth safer.