How do you get information from the moon and why do you use lunar satellites to get it?

The explorer emits electromagnetic waves, which are then received by humans.

After the technical processing of the received image data and the stitching of 19 satellite orbit exploration images, the production of the first lunar image of China's first lunar exploration project was completed, and on this basis, the production of three-dimensional stereoscopic images was also completed. This shows that the five major systems of the project have successfully completed the predetermined goals, and laid a solid foundation for subsequent scientific exploration and research. In the process of project implementation, a number of major key technologies have been broken through in satellite orbit design and product development, long-distance tracking and control, rocket reliability growth, high-reliability launch and detection data processing, and a number of scientific and technological achievements with independent intellectual property rights have been obtained.

First, the control technology of the Earth-Moon transfer orbit, that is, the study of how to control a satellite orbiting the earth to orbit around the moon. This includes how to remediate a control anomaly in the event of a subsequent occurrence. Second, they have conducted research on precision orbit determination technology, especially the Earth-Moon transfer segment and the circumlunar segment, which is the first time for China's aerospace TT&C.

Thirdly, the research on satellite state judgment and control technology under large delay and multi-modality is carried out, which solves the problems of fast and accurate judgment of satellite state and real-time control under different information transmission formats and different transmission rates. Fourth, they conducted research on multi-system joint measurement and control technology.

1. The Moon is the only satellite of the Earth, and the reason why the Moon is a satellite is mainly because the Moon is less affected by the gravitational pull of the Sun. Although the volume of the Moon is not very different from that of the Earth, the Moon is still affected by the gravitational pull around the planet and orbits the Earth.

2. A satellite is defined as a celestial body centered on a planet that periodically orbits according to its closed orbit. So whether a celestial body is a satellite or a virtual planet is not determined by its size, the most obvious example is Jupiter's moon Europa, which is larger in diameter than Mercury, one of the eight planets, but it is still centered on Jupiter and affected by it, so the source of the difference is a moon.

3. At present, 185 satellites have been detected in the solar system, which is the only satellite of the earth, Neptune has 14 moons, Uranus has 27 moons, Saturn has 62 moons, Jupiter has 79 moons, and Mars has 2 moons, which are Phobos and Deimos.

Detailed information on the Moon.

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. Under the lunar crust is the mantle, which occupies most of the volume of the moon. 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 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.

Orbital data.

Two ways:

One is the use of satellite relays. On the extension of the far side of the Moon, there is a special point called the second Lagrangian point of the Earth-Moon system, around which if a satellite is placed nearby, it will drift. We can control the amplitude of its drift so that it can be observed by both the observatory on the far side of the moon and on Earth, and then the signal can be transmitted through this satellite.

Another option is to build an observatory near the polar regions of the moon. Here, the Earth is suspended above the horizon for a few degrees (or for quite some time). You can choose a suitable terrain and place the antenna for low-frequency radio observation in a depression or crater to let the terrain shade the earth.

At the same time, high-frequency antennas for communication are also built at high places to maintain communication with the earth.