Why is the side of the Moon facing the Earth constant?

It is reported that Chang'e-4 will be launched this month and is scheduled to land on the far side of the moon, which will be the world's first unprecedented landing and roving exploration of the far side of the moon. The moon has always been shown as "frontal", so are you curious about what secrets are on the far side of the moon? Why is the far side of the moon so attractive?

The far side of the Moon, the dark side of the Moon, is mysterious because we can't see it directly from Earth. Due to the balance movement of the Moon, the marginal area of the lunar disk sometimes shows a little bit of its back. Overall, 59% of the entire lunar surface can be observed from Earth.

To date, although no spacecraft has landed on the far side of the moon, scientists have obtained some data on the far side of the moon.

For astronomical research, the far side of the moon is a rare place of tranquility. Receiving radio radiation emitted by distant celestial bodies is an important means of studying celestial bodies (including the sun, planets and extrasolar objects), which is called radio observation. Because of the distance of these objects, the weak electromagnetic signature, and the fact that the electromagnetic environment on Earth can interfere significantly with radio astronomy observations, astronomers have been hoping to find a completely peaceful area to listen for the faint electromagnetic signals from the depths of the universe.

The far side of the Moon is shielded from various radio interference signals from the Earth, so that electromagnetic signals that cannot be distinguished from space on the ground and near the Earth can be monitored, thus providing important information for the study of the origin of stars and the evolution of nebulae.

The tranquility of the far side of the moon makes it the go-to place for astronomers to listen to the faint electromagnetic signals from the universe. The phenomenon of a gravitational gradient that causes a celestial body to face another object in the same place forever is called tidal locking (or synchronous rotation, captured rotation), such as the Moon always facing the same side towards the Earth. A tidally locked object takes the same amount of time to make one revolution around its companion once around its axis.

This synchronous rotation causes one hemisphere to face the partner in a fixed direction. The Moon's rotation and revolution period are both about 4 weeks, so whenever you look at the Moon from Earth, you can only see the same hemisphere. It wasn't until 1959 that people were able to see the far side of the moon in its entirety through the Luna 3 probe from the Soviet Union.

The moon revolves around the earth on one side and rotates on the other, and the time it takes to make one rotation is exactly the same as the time it takes to make one revolution around the earth, which is a day.

So, when the Moon rotates around the Earth at an angle, it also rotates itself exactly at the same angle, if the Moon rotates 360 degrees around the Earth.

It also rotates exactly once, always facing the earth on one side and facing away from the earth on the other.

It also rotates exactly the same angle on its own, and if the moon rotates 360 degrees around the Earth, it also rotates exactly once, always with one side facing the Earth and the other side facing away from the Earth. More accurate observations can show that the Moon moves around the Earth in an elliptical orbit and its orbital speed is not as uniform as its rotation speed

Because the moon is subjected to the gravitational pull of the earth for a long time, its rotation period and revolution period are strictly equal, so the moon always faces the earth on one side. That is, only one side of the Moon can be seen from Earth. But after all, the Moon is smaller than the Earth, so the surface of the Moon will be slightly different when viewed from different positions on the Earth, which is called balance motion.

About 59% of the lunar surface can be seen on Earth.

There are two kinds of movement of the moon, rotation and revolution, and rotation and revolution occur at the same time. It's like if you take a ball and throw it in a circle with a net, that's how the moon rotates!

The angular velocity of the revolution of the Moon and the rotation of the Earth is the same. So the two remain relatively stationary.

The moon revolves around the earth on one side and rotates on the other, and it takes exactly the same time to make one rotation as it does around the earth, which is 273 days. So, when the Moon rotates at an angle around the Earth, it rotates itself at the same angle. If the Moon revolves 360 degrees around the Earth, it also happens to rotate once, so it will always face the Earth on one side and turn away from the Earth on the other.

A more precise observation shows that the moon moves around the earth in an elliptical orbit, the orbital speed is not as uniform as the rotational speed, and its axis of rotation is not perpendicular to the orbital plane of the revolution, so we can sometimes see a small part of the far side of the moon. The terrain on the far side of the moon is more uneven and undulating than on the front: there are fewer plains and more craters.