The quiet mood of the moon has created a quiet and beautiful aesthetic mood and aroused the ethereal feelings of many frustrated literati. The moon hanging high in the sky has also aroused people's philosophical thinking, and the moon has become an eternal symbol.
The moon was originally just an asteroid the size of the moon in the solar system. Once, because it ran near the earth, it was captured by the gravity of the earth and never left the earth again. There is also a view close to the capture theory, that is, the earth keeps accumulating substances that enter its orbit, and over time, more and more things are accumulated, and finally the moon is formed.
Extended data:
The moon itself does not shine, but reflects sunlight. The brightness of the moon varies with the angular distance between the sun and the moon and the distance between the earth and the moon. The brightness at the full moon is more than ten times higher than that at the top and bottom chords.
Because there is no atmosphere on the moon, the heat capacity and thermal conductivity of lunar materials are very low, so the temperature difference between day and night on the surface of the moon is very large. The temperature of lunar soil can be measured by radio observation. This measurement shows that the temperature in the deeper part of the lunar soil rarely changes, which is precisely due to the low thermal conductivity of lunar material.
While the moon revolves around the earth, its special gravity attracts the water on the earth and moves with it, forming tides. Tides helped the early aquatic life of the earth to land.
A long time ago, the temperature difference between day and night was large, and the temperature was between the boiling point and freezing point of water, which was not suitable for human habitation. However, due to its special influence, the attraction of the moon to the earth's seawater slows down the earth's rotation, makes the earth's rotation and period of revolution more reasonable, brings us precious four seasons, and reduces the temperature difference, thus making it suitable for human habitation.
Under the long-term effect of the earth's gravity, the center of mass of the moon is not in its geometric center, but on the side close to the earth, so the gravitational potential energy of the moon relative to the earth becomes the smallest. In the process of the moon's revolution around the earth, the center of mass of the moon always faces the side of the earth, just like the earth binds the moon with a rope.
The same is true of other satellites in the solar system, so it is not a coincidence that the rotation period of the satellite is equal to the period of revolution, but there are internal factors.
Baidu Encyclopedia-Moon