How long can Earth s gravity control the moon stars? The Moon is too far away from Earth and huge

The main gravitational pull of the earth is the gravitational pull of the moon and the sun on the earth.

The moon and the earth are very close, about thirty earths in diameter, and according to the law of gravitation, gravity is inversely proportional to the square of the distance, so that although the mass of the moon is not too large, the gravitational pull on the various particles on the earth is relatively large. The mass of the Sun is very large, about 200 billion trillion tons, which is 330,000 times the mass of the Earth, but because the distance between the Earth and the Sun is too far, 400 times the distance between the Moon and the Earth, its gravitational pull on the Earth is only 46% of the Moon's gravitational pull on the Earth. So, the tidal phenomena on Earth are a combination of the forces of the Sun and the Moon, and it is enough to understand that the gravitational pull of the Moon is greater than that of the Sun.

The mass of the Earth is twice that of the Moon, so the common mass center of the lunar-earth system must be greatly biased towards the side of the Earth, and about twice the radius of the Earth from the center of the Earth, the two spheres rotate around this common center of mass every month. The gravitational force of the Moon is important to the Earth, but the amount of this gravitational force is not very large, equivalent to only one ten-millionth of the Earth's gravity. For a 10-ton object on Earth (i.e., gravity equal to 10 tons), the gravitational force is only 1 gram.

Such a small force is usually not felt by people. But the Earth's response to this small gravitational force is very obvious. It has long been discovered that the regular rise and fall of sea water (tides) in a single day is closely related to the moon.

In addition, the earth is not a rigid body, it is generally considered to be an elastic sphere, for a sphere with such a characteristic, under the action of the gravitational force, the earth's solid rock crust will also produce a "tidal" phenomenon, called a solid tide, which rises and falls by about 30 centimeters every day. Of course, the gravitational force of the Earth on the Moon is greater, and it causes the lunar crust to protrude and fall by about 3 kilometers. At the same time, the Earth's atmosphere, because of this tidal attraction, produces "atmospheric tides" every day.

As for the huge body of water, the tidal phenomenon on it is even more obvious, and the port of Moncton in Fendy Bay on the east coast of Canada has a maximum tidal range of up to one meter, which is one of the best in the world. The maximum tidal range of the Qiantang River estuary in China is recorded as meters, of course, the tidal range is not the same in various places due to the different locations and surrounding environments. The gravitational pull of the Moon and the Sun is also a factor of significance in shaping the topography of the land surface.

Immanuel Kant was the first to propose high tides as a factor in changing the speed of the earth's rotation in 1775. In recent years, in **about**forecast**, there are also people who use tidal forces as a trigger factor for **causes. In addition, for physical geography, it is more obvious that tides change the topography of the sea-land junction, affect the shoreline, and affect wave movement.

Earth's gravitational pull is able to permanently control the moon star, and this gravitational pull does not disappear.

It is about 380,000 kilometers away from the earth, and the mass of the moon is not as large as that of the earth, because the volume of the moon is relatively small, which is equivalent to 1 nanometer of the earth49.

The Moon is on average 384 kilometers from the Earth, and the mass of the Moon is much smaller than that of the Earth, and it is expected to be only 1 4 times the mass of the Earth.

The Moon is located about 384401 kilometers from Earth. The mass of the Moon is smaller than that of the Earth, which is 1 3 times the size of the Earth.

kilometers, the mass of the Moon is less than that of the Earth, and it revolves around the Earth.