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where it depends
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[Visitor (111.8.*.*)]answers [Chinese ]Time :2020-04-18
The attraction between any two objects or two particles related to their product of mass, the most common force in nature, referred to as gravity. In particle physics, it is called gravitational interaction and strong, weak, and electromagnetic forces. Basic interaction. Gravity is one of the weakest. The universal gravitation between two protons is only 1/1 of the electromagnetic force between them (1.235 * 10 to the 36th power), and the gravitation of the proton is only strong when it is in one The electric field of 1000 volts / meter is 1/1 of the electromagnetic force (9.761 * 10 to the 9th power). Therefore, the effect of gravitation is not considered when studying the interaction between particles or the movement of particles in electron microscopes and accelerators.The gravity between general objects is also very small. For example, when two iron balls with a diameter of 1 meter are close together, the gravity is only 1.11 × 10 Newton, which is equivalent to the weight of a small drop of 0.113 grams. But the earth ’s The mass is very large, and the two iron balls are respectively subjected to the gravity of 4 × 10 Newton. Therefore, when studying the movement of objects in the gravitational field of the earth, they usually do not consider the gravity of other objects around them. The larger the product, the greater the gravitational force can cause the giant to rotate around the sun. Gravity becomes the only force that governs the movement of celestial bodies, but the reason for this gravitation is not the pull between the celestial bodies, but the celestial bodies For the distortion of its surrounding time and space.The formation of stars gradually shrinks without dispersing under high temperature, and finally collapses into white dwarfs, neutron stars and black holes, due to the extremely large mass causing space-time distortion, which in turn causes space-time squeezing, not from its own gravity Therefore, gravity is also an important factor that promotes the evolution of celestial bodies. The greater the mass, the greater the distortion of space and time, and the greater the gravity...
There is no detailed explanation for why gravitation occurs. Modern physics (general relativity) believes that universal gravitation is caused by space-time bending. It is well known that the line segment between two points is the shortest. This is an axiom in planar geometry. This line segment is a short-range line. However, in In the curved four-dimensional space-time, the short-range line is also bent. Therefore, due to gravity, the planets approach the sun along the short-range line. Due to the mass coincidence (including the speed coincidence), and because the planet has inertia (many people understand it as centrifugal force, This is wrong. The centrifugal force is just an illusion. There is no centrifugal force in the universe at all, and it has not been discovered.).When the mass is not coincident, there will be a gravitational springboard phenomenon, or hit the sun. Among them, the main cause of the celestial system is not gravity, but the space-time distortion caused by the mass...
The attraction of gravity on the earth gives weight to objects and causes them to fall toward the ground. In addition, gravitation is the reason why celestial bodies such as the sun and the earth exist; gravitational bodies without gravitation will not be able to attract each other to form celestial systems, and the life forms we know will not appear. Gravity also causes the earth and other celestial bodies to orbit around the sun according to their own orbits, the moon orbits around the earth according to their own orbits, forming tides and other various natural phenomena we have observed.

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