Why is there a moon Why is the moon bright

This question is quite valuable, because the moon is so disproportionate to the earth from any point of view, first of all, the radius of the moon is a quarter of the earth, the mass is one-eighty-one of the earth, and the gravitational force is one-sixth of the earth, no matter what the angle of view, the moon is quite large, because the largest moon of the solar system is Ganymede, and its diameter is 5262 kilometers. But he is too small for Jupiter. The Moon is 3476 kilometers in diameter, but it is too large relative to the Earth.

So much so that he can even affect the dynamics of the earth's surface. What's more, the moon is hollow, and if it is a naturally formed planet at this point, it cannot be hollow because it is, caused by impact. The moon is wonderful at this point Moreover, looking at the terrestrial planets in the solar system, there is no water gold, and Mars has two small moons that seem to have been captured.

Only the Earth's Moon guarantees a near-circular orbit. Moreover, the moon is moving at a rate of 4 cm per year, and the moon cannot be captured in these two points. It's amazing.

Why does the terrestrial planet only Earth have such a behemoth moon? Third, from the composition analysis, the earth has the highest density in the solar system, the main reason is that the earth has an iron core, so that it can ensure a strong magnetic field. However, if it is the same source of the moon, its density, which is very rare on the earth, is calculated in millions of tons on the moon.

If it is homologous, then why is there such a big difference between the earth and the moon? Some people say that the moon is an outer spacecraft. Personally, I think it's pure nonsense.

Regardless of the level of civilization that can build such a spaceship, just saying that he is so developed, what is he doing around the earth? The earth's civilization is hundreds of millions of years different from him. Just like facing a trilobite, will you seriously deal with him?

Now there is a crooked theory of nibiru, and I personally think that there is more insight in the origin of the moon. Just the origin of the moon When the solar system was just born, the asteroid belt was a complete planet, but a huge planet flew out of the solar system. His self-propelled star system.

It could also be that he himself hit the planet in the asteroid belt. Smash it to pieces, and then his subplanet hits Earth with impact debris. The core material that caused the Earth's axis to deflect and splash was ejected into orbit, and while gradually cooling, it was hit by the impact debris of the planet in the asteroid belt, causing the moon to be hollow and material.

Because the impact of the magma enveloped the air and created a cavity. Purely personal opinion.

In ancient times, there was no electric light, so the moon had to be used for lighting.

The moon is the moon, and the sun's light shines on the moon and reflects it to the earth, so it is visible to humans.

Because the Six Dao Immortals used the Earth Burst Celestial Star to create the moon.

What the poet writes about without the moon; No moon, what to see in the Mid-Autumn Festival; There is no moon, where can the moon run ·· So there is the moon.

You have to ask the universe about this, she gave birth to the moon.

Without the moon, the sky is bright, and we can't sleep!

And because there is no moon, how did you come out?

Since planets and moons do not bai shine, du

The only reason we can see it is that they reflect light from other sources, and the strongest source of power in the solar system is the sun.

Reason analysis: The moon has a diffuse reflection effect, it is a relatively bleak planet, and even the dust on it is quite harsh, but it can still successfully reflect light. The moon will emit light from different angles, and the surface of the moon is not smooth, so light can come to the earth from different angles, although the moon can only reflect 7% of the sun's light to be received by the earth, but people can still see the moon clearly.

The atmosphere on the Moon is quite thin and very different from the Earth's atmosphere, so if the sun's rays come to the moon, it will not only successfully reflect the light, but also absorb some of it, so you can see the beautiful glowing moon.

It's always lit up. We don't see it at night (except in bad weather) because the earth is spinning around it.

The moon is commonly known as the moon, also known as the sun yin. The age of the Moon is also about 4.6 billion years, and it is closely related to the Earth. The Moon also has a layered structure such as crust, mantle, and nucleus.

The outermost layer of the lunar crust is on average about 60-65 km thick. Below the lunar crust to a depth of 1,000 km is the lunar mantle, which occupies most of the moon's volume. Underneath the mantle is the lunar core, which is about 1000 degrees warm and most likely molten.

The Moon has a diameter of about 3476 kilometers and is 3 of the Earth's 11. The volume is only 1 49 of the earth, the mass is about 735 billion tons, which is equivalent to 1 81 of the mass of the earth, and the gravity of the moon is almost equivalent to 1 6 of the earth's gravity.

There are dark parts and bright areas above the Moon. When early astronomers observed the moon, they thought that the dark areas were covered with seawater, so they called them "seas". The famous ones are the sea of clouds, the wet sea, the still sea, etc.

The bright part is the mountains, which are dotted with craters. Located near Antarctica, the Bailey crater is 295 kilometers in diameter and can fit the entire island of Hainan. The deepest mountain is Newton's crater, which is 8,788 meters deep.

In addition to craters, there are also ordinary mountains on the lunar surface. Mountains and deep valleys are stacked on top of each other, creating a unique scenery.

The front of the Moon is always facing the Earth. On the other hand, the far side of the Moon is mostly invisible, except in the area near the edge of the Moon's surface which is occasionally visible due to the movement of the scales. In the days when there were no probes, the far side of the moon was an unknown world.

One of the great features of the far side of the Moon is that it has almost no of the darker lunar features of the Lunar Sea. And when the probe is on the far side of the moon, it will not be able to communicate directly with Earth.

The moon shines because it shines on the sun, and in the morning and evening, when the sun sets (or rises) and the moon rises (or sets), a small error is formed. That is, when the sun shines on the earth, the moon is just about to leave or is about to come, and then it shines a little bit of the moon itself, and the moon becomes visible.

When the moon is far away from the sun, the moon can only be seen in the night sky. If the Moon is not too far away or too close to the Sun, i.e. on those days before or after the first or second quarter, the Moon will appear in the sky at the same time as the Sun in broad daylight, sometimes to the east of the Sun, sometimes to the west of the Sun.

Orbital motion

1. Revolution. The Moon orbits the Earth in a circular orbit. The great circle of this orbital plane on the celestial sphere is called the "white path".

The plane of the white channel does not coincide with the celestial equator, nor is it parallel to the plane of the ecliptic, and the spatial position is constantly changing. Cycle day. The average inclination of the lunar orbit (white path) to the Earth's orbit (ecliptic) is 5°09.

But it is known that the Moon is gradually departing from the Earth at an average rate every year.

2. Rotation. The Moon rotates while revolving around the Earth, and the period day is exactly a sidereal month, so we can't see the far side of the Moon. This phenomenon is known as "synchronous rotation", or "tidal locking", which is almost a universal law in the world of solar system satellites.

It is thought to be the result of the long-term tidal action of satellites on planets. The balance movement is a wonderful phenomenon that allows us to see 59% of the surface of the moon.