The moon is the satellite of the earth and the earliest planet where humans set foot. The moon landing is a big step in human history. The diameter of the moon is one-quarter of the diameter of the earth, and the quality is one of the 80ths of the earth.

The moon is the largest satellite. Its surface can be covered with a variety of different shapes of meteorites, which shows how much it has experienced.

Regarding the formation of the moon, there are several hypotheses in the scientific community. There is a saying that before 4.5 billion years ago, a star hit the earth and collided with a fragmented block. Due to the attraction of the earth's gravity, the moon was produced.

For example, the tilt angle of the moon and the earth is the same, and many components on the moon are on the earth. Although the body is much smaller than the earth, there are many similarities between the two. The facts have also fully verified this. But it is still not enough to confirm, and it remains to be inspected by scientists.

How far is the moon from us? Many of you know it's about 380,000 kilometers. This number is actually the approximate average of the distance between the Earth and the moon.

When it's far away, the moon will be more than 405,000 kilometers away, and when it's close, it'll be just over 360,000 kilometers away.

The difference between the two is more than 40,000 kilometers, and because the moon is always orbiting the Earth, the distance is always changing, making it difficult to measure the exact distance between the Earth and the moon.

When we look up, we can see the moon. It is also the closest star to the Earth. The outline of the moon can also be seen clearly. Most of the time we see the moon is not all round, and sometimes it is half round.

The moon itself is not glowing. The glowing moon we see is due to exposure to the sun, so this is why the moon is round and semi-circular. This is because the sun's irradiated angles are different when they are moving, so the shape of the moon we see is different.

When the sun and the moon are particularly close, the smaller moon we see. When they are far away, the larger moon we see. Therefore, the size of the moon depends on the distance from the sun.

When the sun, the earth, and the moon moved in a straight line, we could not see the moon. That's why we can't see the moon for a few days in a month.

So why can we see the moon's shadow during the day? It is understood that the moon reflects the sun's light, and the moon can be seen when the intensity of the reflection is higher than the intensity of the light at the time.

Generally, the intensity of light in the day is relatively large and the moon cannot be seen. The moon appears only when the intensity of light at night is weak.

If the moon can still be seen during the day, it means that the reflection intensity of the moon at that time was higher than the light intensity at that time.

Sometimes when the sun is not fully mountainous in the evening, we will also see that the moon has faintly appeared in the sky. The scientific principles of this are actually the same.