When people are alive, they must think about several questions, such as "What is the universe? How big is it? How did the world come into being? Who am I? Who are you? Why is there a difference between you and me? " And so on. These seem boring, but
A question that everyone has thought about but can't figure out. From ancient times to the present, different people have given different models, such as God's creation, God's creation, Brahma's dream of the world. Everything is empty and nothing, no matter what religion.
This is difficult to understand and mysterious. It revolves around the question of how to live and why to die. In this article, "I" put forward my own point of view to explain this problem, hoping to discuss it with every friend who thinks about these problems.
Among the nine planets in the solar system, the light blue earth is the only planet full of life. Its mountains, oceans, forests, blue sky and poles have nearly 2 million kinds of life, which deserves its name.
Paradise of life. However, why does life love earth so much?
Although the academic circles can't give an accurate definition of life at present, life is a complex phenomenon, which has two basic characteristics: first, it can replicate itself; The second is to be able to metabolize. Both activities need to be carried out.
For energy, as far as animals and plants are concerned, the ultimate energy source is the sun.
If the planet is too far away from the sun, such as Pluto, it receives little sunlight, just like the legendary underworld, life can't survive because it can't get enough energy; If the planet is too close to the sun, such as gold,
Stars receive a lot of sunlight, and the temperature is above 400 degrees during the day and night. Just like the mythical purgatory, life is hard to survive.
The earth is neither too close nor too far from the sun, and receives moderate light. Plants can freely use solar energy for photosynthesis and store the energy needed for life activities. This energy is stored when vegetarians eat plants.
Energy reaches the body of a vegetarian. When a carnivore eats a vegetarian, energy reaches the body of a carnivore again ... In this way, it is the light of the sun that can start the life machines of animals and plants on the earth and make their descendants happy.
Prosperity is endless.
Suitable temperature on the earth is necessary for life activities. The energy needed for life activities is provided by metabolism. Too cold or too hot environment is not conducive to normal metabolism, and can only be planted at the right temperature.
Things can effectively carry out photosynthesis.
The earth is protected by the atmosphere, which is by no means necessary for the life living in it, because: the atmosphere blocks the strong ultraviolet rays from space, so that life on earth is not harmed; Atmospheric barrier
Living in most meteorites that hit the earth, the surface of the earth is not as uneven as the surface of the moon; The atmosphere is like a thick quilt, so that the sunlight shining on the earth's surface will not be emitted into space, and the temperature on the earth will be reduced.
The degree will not change greatly; Without the protection of the atmosphere, there would be no wind and rain on the earth, and there would be no rivers, lakes and seas. The earth will be a dead and desolate planet.
There is a prosperous life on the earth, which is inseparable from its being a rocky planet. The core is molten magma, and its main component is iron. When the earth rotates, the iron core produces a strong magnetic field.
This magnetic field surrounds the earth and protects it. When a solar storm, that is, a high-speed charged particle stream from the sun violently hits the earth, the magnetic field around the earth blocks it from space, thus protecting the earth.
Life is alive.
For life, the conditions on the earth are unique. However, in the vast universe, the solar system is just a drop in the ocean, and the sun is not the only star in the vast universe. Is the earth the only star in the vast sea of stars?
Is there a planet where life exists?
The primitive water environment of the earth created conscious objects on the earth. After a long evolution and some environmental factors, aquatic creatures began to live on land and even reached the peak of dinosaurs. Most of them were hit by asteroids.
About 99% species are extinct (the most popular explanation at present), which gives some naturally weak creatures a chance to develop. After a long time, apes have evolved and gained some wisdom. It will take many years to accumulate what they are now.
Knowledge, a long history, and human beings who now dominate the earth temporarily.
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