What is the concept of Chang e 1 hitting the moon?

Hitting the moon is a common way in the international space community to end the 'mission' of lunar probes. Academician Ouyang Ziyuan said. "Instead of letting the lunar spacecraft fall to the moon because of the fuel exhaustion, it is better to choose the way to hit the moon, which can also add some data accumulation for human understanding of the moon.

Professor Xiao Naiyuan of the Department of Astronomy of Nanjing University revealed that it is of great scientific significance for human probes to choose to hit the moon. A successful impact will kick up a large amount of lunar dust. Scientists are analyzing the composition of this lunar dust to explain the mystery of the moon's origins.

The mystery of the origin of the moon is currently quite controversial. In addition, if the probe can hit the predetermined location at the specified time, it will lay the foundation for the next precise landing of other human probes on the moon or other stars. At the same time, it also provides an engineering basis to prevent asteroids from hitting the earth.

Because human beings deal with asteroid impacts that threaten the safety of the earth, the current means is to use artificial nuclear ** to hit the fixed position of the asteroid, so as to change the asteroid's orbital route. This operation is undoubtedly a matter of experience.

It is planned to hit the moon so that Chinese scientists can observe the lunar dust raised and make contributions to China's aerospace and astronomical work for the last time. There will be no return. If all the scheduled scientific targets are successfully achieved within a year, Chang'e-1 may end with a collision with the moon.

When it hits the moon, Chang'e-1 will take high-resolution** close-up shots of the moon for analysis on the ground. The "Chang'e-1" satellite will fly 380,000 kilometers to explore the moon. It does not run directly to the moon, but first circles the earth three times and then runs to the moon.

The route of Chang'e's journey to space was designed with the participation of experts from Nanjing University. A relevant expert from the Department of Astronomy at Nanjing University told reporters that it will pass through three orbits——— phase-modulated orbit, Earth-Moon transfer orbit, and circumlunar orbit. When Chang'e-1 reached perigee for the third time in phase-modulated orbit, and the two ignition changes when it reached perigee for the first time were the most critical.

The former allows the satellite to successfully enter the Earth-Moon transfer orbit; The latter moves from the Earth-Moon orbit to the circumlunar orbit. Both of these changes were ephemeral and unique, and could not be revisited. Before entering the Earth-Moon transfer orbit, Chang'e-1 has only half an hour to accelerate into the best orbit at the best position, and after this half hour, it will be difficult to successfully enter the Earth-Moon transfer orbit, so it must not be missed.

In a circular orbit 200 kilometers from the moon, Chang'e-1's exploration field can fully cover the moon and obtain high-resolution images. According to reports, at present, there are only two or three three-dimensional maps of the moon abroad, and they are incomplete. Chang'e-1 will be equipped with a CCD stereo camera and a laser altimeter, both of which will combine to create a complete and detailed stereoscopic map of the moon.

Four major scientific tasks of China's first lunar exploration project:

1. Obtain three-dimensional images of the lunar surface, finely divide the basic structure and geomorphological units of the lunar surface, and study the shape, size, distribution, and density of the lunar surface impact craters, so as to provide basic data for the division of the surface age of terrestrial planets and the study of early evolutionary history, and provide basic data for the site selection of the lunar surface soft landing area and the location optimization of the lunar base.

2. Analyze the distribution characteristics of the content of useful elements and material types on the lunar surface, mainly to investigate the content and distribution of 14 kinds of elements such as titanium and iron that have development and utilization value on the lunar surface, draw the distribution map of the whole moon of each element, and the thematic map of lunar rocks, minerals and geology, etc., discover the enrichment areas of each element on the lunar surface, and evaluate the development and utilization prospects of the lunar mineral resources.

3. Detection of lunar soil thickness, that is, the use of microwave radiation technology to obtain the thickness data of lunar soil on the lunar surface, so as to obtain the age and distribution of the lunar surface, and on this basis, estimate the content, resource distribution and resource amount of helium-3 fuel for nuclear fusion power generation.

4. Exploring the space environment from the Earth to the Moon. The average distance between the Moon and the Earth is 380,000 kilometers, and it is located in the far magnetotail region of the Earth's magnetic field space, where satellites can detect the solar cosmic ray energetic particles and solar wind plasma, and study the interaction between the solar wind and the Moon and the Earth's magnetic field magnetic tail.

Discovery 1: UFO. Spacecraft from the former Soviet Union and the United States have photographed some of the "spires" on the Moon'。

These protruding spires are estimated to be 12?22 meters high. The diameter is about 15 meters.

According to the well-known UFO authority, Basic Law Trench. They "seem to have been placed there by intelligent beings." What are these mysterious spires photographed by the former Soviet Union's "Moon-19" and the American "Astronaut-2"?

Can it be used as evidence that the Mayans engaged in mineral mining on the moon 700,000 years ago? Or are they part of the sophisticated communications equipment that is still in use today? About 40 years ago, astronomers discovered some unexplained "domes" on the surface of the moon.

"By 1960, more than 200 had been recorded. "What's even stranger is that people find out.

They're still moving! One part of the moon moves to another. Discovery 2:

Human face building. As mentioned earlier, the Mayans crossed space to our solar system in search of the metal titanium as well as iron and nickel. And the "moon dust" work brought back by our astronauts from the moon shows that there is a large amount of titanium on the surface of the moon, so the moon will naturally attract the attention of the Mayans.

It seems certain that the Mayans must have been to the moon before they traveled to Earth, because landing on a planet like Earth would have required careful research beforehand. On the surface of the earth, 70 percent is water, and the dense layer of popularity makes it difficult to discern the details of the earth. The Moon is much smaller and is not disturbed by the atmosphere (because there is no air on the surface).

He said that under the influence of **, volcanoes, floods, and radiation belts, the Mayans would soon mine the moon for metals after establishing their base on planet X - one of them focused on the lunar meeting ore layer, but first began to mine the metal core of the moon in large quantities - and at the same time, we could study our star from the moon, and small expeditions and engineers could visit the earth at any time.

How do you say this? Only.

Even if you find an alien base, you won't tell us. Because in fact, a lot of countries know that there are things on the moon and buildings that don't have the right to know. No, it wasn't announced.

There's a food that seems to be called the mysterious moon, you look at the mystery that the NASA moon ** folk computer master restored... Think of it yourself.

I didn't have time. What it wants to discover most is the helium-3-rich zone. Helium-3 is the new fuel for space and the ultimate nuclear fusion. However, it's not bad to be able to see the terrain, it's not easy to go aerospace, and it's still worth cheering!

A little more ate my homework mom this is my homework mom this is my homework mom this is my homework mom this is my homework mom this is my mom this is my me.

At 1:30 a.m. on December 2, 2013, Chang'e-3 launched the Fire World Fighting Arrow - the Long March-3B carrier rocket ignited.

At 21:11 on December 14, 2013, Chang'e-3 landed safely in the area east of Hongwan on the return moon.

Then, almost a decade now, there are still some scientific payloads on Chang'e-3 that are working properly.

At 21:11 on December 14, 2013, Chang'e-3 achieved a "soft landing" on the moon.

The process of Chang'e-3 approaching the lunar surface can be simplified into three stages: turning on the thrust reverser engine to slow down when it is 15 km away from the lunar surface, and hovering when descending to an altitude of h 100 m from the lunar surface to find a suitable landing site on the moon; After finding the moon landing point, Pimo guessed that the velocity continued to decrease, and the velocity decreased to 0 again when it was 4m away from the lunar surface. After that, turn off all engines and make it fall to the surface of the moon in a free-fall motion.

There is no atmosphere on the Moon, and rocket engines and propulsion systems, which traditionally rely on air friction to slow down, no longer work on the Moon. There is a layer of dust on the lunar surface, and when the probe lands on fire, it is likely to stir up lunar dust, which will affect equipment such as optical sensors. Chang'e-3 will rely entirely on autonomous control to complete a one-yard series of actions.

At. Chang'e-1 is still on the moon.

, but it's just a fragment of it.

Chang'e-1 is China's first artificial satellite orbiting the moon. The main mission of the satellite is to obtain three-dimensional images of the lunar surface; The content of useful elements and the distribution characteristics of material types on the surface of the moon were analyzed. Detect lunar soil thickness and the Earth-to-Moon space environment.

Chang'e-1 satellite.

October 24, 2007 at Xichang Satellite Launch Center.

Launch. Around November 7, 2007, the Chang'e-1 satellite underwent several orbit changes and near-moon braking, and entered the polar-lunar orbit of the moon for 127 minutes. This is the working orbit of the satellite's flight around the moon. This orbit is circular, 200 kilometers above the surface of the Moon.

On March 1, 2009, the Chang'e-1 satellite completed its mission, crashed into the moon's intended location, and remained there forever.

There is no Chang'e on the moon. Chang'e running to the moon is from Liu An's "Huainan Zilan Training" in the Western Han Dynasty: Yi invites the medicine of immortality to the Queen Mother of the West, and Chang'e.

Stealing to run to the moon, there is a mourning.

Chang'e to the moon is one of the top ten love stories in China. In Han myths and legends, there are 10 suns in the sky at the same time, and the earth is baked into scorched earth.

Shot out nine suns for the people, and the Queen Mother of the West Heaven rewarded him with the elixir of immortality. His wife Chang'e secretly took these medicines while Hou Yi was not paying attention, and suddenly she became an immortal and flew to the heavenly palace, and the queen mother let Chang'e spend time in the Guanghan Palace in order to punish her.

(1) m month r 2 = 4 2mr2 t 2 from gm month r 2 3 = 4 2 gt 2

There is =m v v=4 3 r2 3 so =3m month 4 r2 3=3 gt 2

2) Because gmm r1 2=mg then gm=r1 2g because gmm r 2=4 2rm t 2 so t 2=4 2r 3 gm=4 2r 3 r1 2g

Finally, T gets the cycle at the beginning of the root.

High School Physics Compulsory 2, take a look for yourself, it's really not difficult No, you have to go to the teacher, don't accumulate it.