Change four relay star will be launched early in May to establish Earth Moon communication.

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 Change four relay star will be launched early in May to establish Earth Moon communication.


This April 24th is the third China space day. Yesterday, the Beijing branch of China Aerospace day was held at the China Science and Technology Museum. Wu Weiren introduced the related scientific issues of Change four to the public at the event. Change four lunar exploration has attracted extensive attention from the Chinese public this year. Change four is also among the most anticipated events in 2018. The reporter learned from the national defense science and Technology Bureau that Change four includes repeater, lander and patrol device. The relay star is scheduled to launch in the first half of this year and will reach the Lagrange L2 point (the earths monthly gravitational equilibrium point) to achieve measurement and control communication and data transmission between the detector and the ground. The patrol group is planned to launch in the second half of this year, reach the back of the moon, carry out the scientific exploration and research of the lunar base low frequency radio astronomy, the topography and mineral composition of the back of the moon, the shallow structure of the patrol area and so on. It is expected to obtain a batch of original scientific achievements. In addition to Chinas exploration mission, Change four will also carry out the global mission. At present, there are 4 international cooperative scientific loads on the Holland low radio frequency detector, the German monthly neutron and radiation dose detector, the Swedish neutral atomic probe and the Saudi lunar miniature optical imaging detector. Explanation 1 Why do you make a soft landing on the back of the moon? Isolating electromagnetic noise can detect the early shortwave signal of the universe. The moons revolution is the same as its rotation speed, which is 27.3 days, due to the earths tidal locking to the moon. Only about 59% of the moons surface can be observed by the earth. That is to say, 41% of the moons back is always blocked by the moon. These low frequency shortwave can help us study the origin of the universe. It is impossible to detect the front of the moon because it receives electromagnetic noise. Zheng Yongchun, a researcher at the National Astronomical Observatory of the Chinese Academy of Sciences, said. At present, there are more than 120 lunar exploration activities all over the world, but no detector has ever landed on the back of the moon. Wu Weiren said that if you want to go deep into the mystery of the moon, you must go there. At present, China has the conditions and capability to carry out the detection of the soft landing on the back of the moon and strive to create the worlds first. In the past, the Soviet lunar probe 2 photographed the back of the moon for the first time in 1959. In 1968, the US Apollo 8 spacecraft first witnessed the back of the moon with humans. At present, the most detailed information about the back of the moon is from the US Lunar Reconnaissance Orbiter (LRO), which was launched in 2009. How difficult is it to land on the back of the moon? Landing on mountainous terrain is difficult, launching relay satellites to establish earth month communication. Change 1 and No. two have photographed the back of the moon during the month of the moon, and the full map of the lunar surface, taken by Change two, has a resolution of high definition of 7 meters. Through these photos and data, scientists found that the topography on the back of the moon is far more complex than the front, and more hills and valleys. Zheng Yongchun said that this is because the moon was hit by a large number of asteroids, forming many craters, which looked like a lot of craters. Complex terrain brings more difficulties for Change four landing. Wu Weiren drew an analogy: Change three is equivalent to landing in the North China Plain, and Change four is equivalent to landing in the mountainous area of Yunnan, Guizhou and Sichuan. At the same time, telemetry and control are also a difficult problem. The electromagnetic wave can only be transmitted in a straight line. When the probe flies to the back of the moon, how can it communicate with the earth? Scientists will use a relay satellite to solve this problem. Before the launch of Change four, China will launch a relay satellite next month, located at L2 L2, about 450 thousand kilometers from the center of the earth and about 65 thousand kilometers away from the heart of the moon. According to Xing Qiang, the Lagrange L2 point is located in a particular position of the earths center of heart and the moons center of orbit and near the moon. Generally speaking, the point can see the earth and see the moon, so it can become the information transfer station between the Change four and the earth. Chinese scientists are no stranger to Lagrange L2. The Change two satellite, launched in 2010, continued its flight to the deep space after completing the established lunar exploration mission. It arrived and flew around Lagrange L2 point. The 4 scientific instruments carried by them have been jointly detected in this position to fill the scientific exploration gap of the ion energy spectrum, solar flare eruption and cosmic gamma storm in the far magnetic tail region of the earth. Xing Qiang said that the use of relay communication technology in lunar exploration is also a validation of deep space exploration and interplanetary exploration technology. expectation China is demonstrating the construction of unattended lunar scientific research station Our country has now demonstrated the longer term lunar exploration and development plan. At the Seventh International Conference on space technology innovation held last year, the person in charge of the National Space Administrations lunar exploration and Space Engineering Center revealed that China is carrying out the demonstration of the lunar scientific research station. The lunar scientific research station will be a long-term supply, independent operation, unmanned lunar infrastructure, and the future development of scientific research and technical test based on robots. The reason for establishing a scientific research station is that some work takes a long time to produce results. Relying on scientific research stations, we can work longer hours, carry out scientific research and energy development tasks. Pang Zhihao, a spaceflight expert, said that lunar exploration is divided into three ways: lunar exploration, lunar landing and month, of which there are two forms of unmanned research base and human moon base. Pang Zhihao explained that the moon has no atmosphere barrier and small vibration, which is an ideal environment for astronomical exploration. The lunar research station can also be built on the moon, exploring the earth and deep space, and becoming a springboard to distant and deep space. Source: Beijing News Editor: Guo Ping _B7442 At the Seventh International Conference on space technology innovation held last year, the person in charge of the National Space Administrations lunar exploration and Space Engineering Center revealed that China is carrying out the demonstration of the lunar scientific research station. The lunar scientific research station will be a long-term supply, independent operation, unmanned lunar infrastructure, and the future development of scientific research and technical test based on robots. The reason for establishing a scientific research station is that some work takes a long time to produce results. Relying on scientific research stations, we can work longer hours, carry out scientific research and energy development tasks. Pang Zhihao, a spaceflight expert, said that lunar exploration is divided into three ways: lunar exploration, lunar landing and month, of which there are two forms of unmanned research base and human moon base. Pang Zhihao explained that the moon has no atmosphere barrier and small vibration, which is an ideal environment for astronomical exploration. The lunar research station can also be built on the moon, exploring the earth and deep space, and becoming a springboard to distant and deep space.