Shulou(Shulou.com)11/24 Report--

(source: ESA / Hubble&NASA,A. Filippenko) when you look up at the sky, see the change of the sun and the moon, and find that the stars move slightly, you will naturally think of the rotation of the earth. When you find that the seasons change and the climate is different, you will think of the revolution of the earth taught by your teacher. However, when we think carefully about why the earth and other planets rotate and revolve, the mysterious gear will begin to rotate.

Chapter one: do you also want to dance? The beginning of chaos, the beginning of the universe, the universe is still a vast nebula, desolate, lonely, nebula distribution is not uniform, some places material sparse, some places material dense. The nebulae can't stand "loneliness" and plan an unusual "dance show". Dense and different nebulae attract each other, get close to each other, attach to each other, and hug each other tightly under the action of gravitation. the angular momentum is "hidden", so that the nebula will more or less rotate during the collision (non-direct collision), like when you hit and grab your friend on the side during skating. Will rotate under the action of the force, to a gorgeous "Errenzhuan". Small collisions gather big, big collisions gather into bigger, over time, the nebula becomes smaller and gathers into ellipsoidal objects with spins, that is, the huge planets that fall in love with ballet.

Chapter 2: professional team, clear division of labor between planets will also collide with each other, fusion, over time, under the opportunity to form a stable rotation system, in a rotation system, there are stars, planets, moons. Stars belong to the kind of "high-end people" standing in the center of the dance floor. During the gathering process of the primitive nebula, huge balls of matter are formed. The friction and gravitational collapse between the matter raise the temperature of the center, trigger nuclear fusion, and begin to glow and become the "focus" of the whole scene. The planets are the "dance lovers" who dance around the center of the dance floor, and the moons become the "dance lovers" of the planets. They do not have the mass of stars, nor can they produce nuclear fusion glowing heat like stars. The small ones walk around the big ones, "forming a super-strong"dazzling dance pattern". Between them, relying on gravity to maintain a long-term balance, very dedicated ballet performance. For example, celestial bodies such as the sun, eight planets, dwarf planets and moons of various planets constitute today's solar system. Strangely, the eight planets all revolve from west to east, as if planned. The number of companions of the eight planets is different. It is worth complaining that 82 moons of Saturn and 79 Neptune stars of Jupiter have been found, but they are not as single-minded as our Earth. The moon is a natural moon, and of course there are also "oligarchs" like Saturn and Mercury. They have a clear division of labor and harmonious exchanges, and together form a harmonious and loving "big family". Fate makes them meet, binds them, and locks them in. Outside the solar system, this pattern is numerous, of course, there is also a double star system, multi-star system. Diverts a variety of dance styles, highlighting colorful styles.

Chapter 3: I am getting smaller and stronger. Will the rotation speed of the planet change? The answer is yes. For example, the rotational speed of a neutron star can reach 700r / s, is it only because of the early collision? This has to mention the "angular momentum" of the old brother. if the neutron star is regarded as an isolated system, it can be regarded as the conservation of the angular momentum of the neutron star, while the neutron star collapses from the star, the radius decreases, the angular momentum remains the same, and the rotational speed increases. It can also be understood this way, just like sitting in a swivel chair with open arms and asking your friend to rotate the chair. When you suddenly withdraw your arms, you will feel a significant increase in speed, on the contrary, when you stretch out your arms, the speed will slow down. Sure enough, what is concentrated is the essence. Studies have shown that the Earth is also in a "hurry" and its rotational speed is slowly increasing. Perhaps, the Earth and other planets have also experienced such a process from the beginning of their birth to the present: the initial rotational speed of celestial bodies is very small, but their volume decreases due to gravity or other reasons, thus increasing the rotational speed. Of course, it does not rule out that the gravity and internal structure of other planets may also affect the rotation speed, which is worthy of our consideration and discussion. But to be sure, this grand ballet performance will not stop easily.

Chapter 4: how can we live without you! The earth, like many planets, has rotation and revolution. Rotation, so that day and night alternation, so that the concept of time, so that the sun has a selfless and equal distribution, so that nature is full of vigor and vitality, enjoying the regular day and night. The revolution makes the world colorful, with the splendor of the four seasons, the beauty of regularity and the beauty of change. Ballet, which has been dancing for about 4.6 billion years, has the same style and graceful posture. If the earth stops rotating, the sun will continue to burn the side of the earth, the two sides of the earth opposite and facing the sun will become purgatory of ice and fire respectively, and the rich and colorful biological systems will disintegrate and gradually die out. If the earth stops turning, under the great gravity of the sun, the earth will go straight to the sun, gradually scorched by the sun's high temperature, the temperature will rise sharply, and the ecosystem will collapse. The earth is turned into a barren land, and finally, a "death embrace" with the sun comes to an end.

The rotation of the planet goes on and on, performing a section of brilliant "ballet dance". They are born in the rotation, harmonious in the rotation, and walk through the whole life in the rotation, playing the stubborn dancers all their lives, writing insipid and wonderful stories one by one.

This article is from the official account of Wechat: stone popular Science Studio (ID:Dr__Stone), by niong Kang.

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