Why did Change four launch two times? Whats the use of Change four?

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 Why did Change four launch two times? Whats the use of Change four?


The back and front of the moon

Because the back of the moon has geological structures different from the front of the moon, many mountains are more valleys, so it is of great value to the study of the early history of the moon and the earth. The earth has gone through many times, and the traces of the early geological history have disappeared. We can only hope to excavate the early history of the earth from the well preserved geological records on the moon. Therefore, the comprehensive exploration of the appearance, the material composition, the lunar soil and the superficial structure of the lunar surface on the back of the moon can promote the new cognition of the history of the early evolution of the moon, and it is also of great value to the study of the early history of the earth.

A map of the moons quilt, with more craters on it

In addition, because of the earth tide lock, the moons rotation and the rotation of the rotation, and the balance of the balance, the earth can never see the back of the moon, only about 59% of the moon can be observed by the earth, that is to say, the 41% place on the back of the moon is always blocked by the moon. Therefore, for astronomy research, the back of the moon is a rare place of tranquility. Radio radiation from distant objects is an important means of studying celestial bodies, called radio observations. As these celestial bodies are far away, electromagnetic signals are very weak, on earth, the electromagnetic environment of daily production and life will have a significant interference in radio astronomy observation, so astronomers have been hoping to find a completely quiet area to monitor the weak electromagnetic signals from the depths of the universe. The back of the moon can shield all kinds of radio interference signals from the earth, where it can monitor the indistinguishable electromagnetic signals from the ground and the earths space, and study the origin of the stars and the evolution of the nebula, which is expected to achieve significant astronomical results. Due to the interference of the earths ionosphere, it is difficult to carry out the radio astronomy observation of less than 10MHz on the earth, and the astronomical observation of space radio in the earth orbit and the front of the moon will be disturbed by the ionospheric reflection and artificial radio. The back of the moon shields radio interference from human activities and radio emission from lightning and Aurora, and is considered the best place to carry out low frequency radio astronomy observations. Using the unique radio environment on the back of the moon, the astronomical observation of low frequency radio can be carried out to fill the gaps in the astronomical observation of the 100kHz ~ 10MHz frequency band. It is expected to achieve original achievements in the solar wind shock wave, coronal mass ejection and the generation mechanism of high energy electron beam, for the future of the Dark Age and dawn of the universe. The exploration lays the foundation. As we all know, many things in the world are double-edged sword, which are both advantageous and harmful. It is because the back of the moon can never be seen on the earth, so it is difficult to detect the moon on the back of the moon, because the probe landing on the back of the moon does not communicate directly with the earth station, which is the weight of a countrys lunar probe on the back of the moon so far in the world. For reasons.

The relative position relationship between magpie bridge moon relay satellite and the earth and moon

What should I do? The best solution is to launch a lunar trunking satellite to build a bridge between the earth station and the lunar probe on the back of the moon for communication. To this end, before launching the Change four lunar probe, we used the long march four rocket to send the magpie bridge to Lagrange 2 in May. The moon relay satellite is about 480 thousand kilometers from the earth, about 80 thousand kilometers from the moon, and its life expectancy is 5 years, and the operation is very stable. At this point, the moon can be placed between the earth and the moons relay satellites, so that the satellite can see the earth and the moon at the same time, so that it can ensure real-time communication and solve the problem of invisible, unable to touch, and unable to communicate on the back of the moon, which provides a communication link between the Change four and the earth station. This is the first time in the world. With the moon relay satellite, we can measure and control communications and scientific data transmission on the earth on the earths Change four on the back of the moon.

The diagram of Change four and the communication of the earth

Magpie bridge moon relay satellite schematic.

In addition, 2 Longjiang 1 and two lunar orbit formation flying microsatellites, developed by the Harbin Institute of Technology, were launched in the launch of the magpie bridge moon relay star (one of which has a small optical imaging detector that has been developed by Saudi Arabia). Longjiang No. 1 and two are the first near distance formation flying systems in the moons orbit, and the worlds first INTERSTAR interference radio astronomy observation system. They will take space astronomical observations at a super long band below 30MHz to open new windows for human understanding of the universe and detect weak signals from the depths of the universe. To study the Dark Age before the first generation of stars in the universe.

Longjiang No. 1 microsatellite

After launching the magpie bridge moon relay satellite, China will launch Change four lunar probe at the end of this year.

Change four task flow

Through these two launches, Change four is expected to achieve three feats: the first human spacecraft to visit the back of the moon; the first human spacecraft to relay the Earth Moon Lagrange 2 to Earth Moon; for the first time to provide a scientific research platform for scientific workers on the back of the moon, a significant number of original originality is expected. Scientific research results. For example, the most advanced low-frequency radio astronomical observation in the field of space science, using the unique conditions of shielding the earths radio interference on the back of the moon, can fill the international gap. The geological characteristics of the oldest lunar crust, preserved on the back of the moon, can be developed for the first time in the world to establish a comprehensive geological profile and evolution model integrating topography, topography, and material components, and obtain new recognition of the history of the early evolution of the moon. (Hang Tianren) this article sources: NetEase military responsibility editor: ye Zhi hair _NBJS6073 this article is the original NetEase manuscript, copyright belongs to NetEase all, without authorization can not be reloaded, the authorized media download and use of the agreement must indicate the source of manuscript: the violator will be accountable for the responsibility. .ep-statement{clear:both; float:left; line-height:2; font:12px/22pxSimsun; color:#666; margin-top:34px; background:url (http://cms-bucket.nosdn.127.net/411e05150f814d21b7b3f708b21ccd3520180313105138.png) no-repeat04px; text-indent:18px;}.Post_body.post_end_ad{margin-top:36px;

Through these two launches, Change four is expected to achieve three feats: the first human spacecraft to visit the back of the moon; the first human spacecraft to relay the Earth Moon Lagrange 2 to Earth Moon; for the first time to provide a scientific research platform for scientific workers on the back of the moon, a significant number of original originality is expected. Scientific research results. For example, the most advanced low-frequency radio astronomical observation in the field of space science, using the unique conditions of shielding the earths radio interference on the back of the moon, can fill the international gap. The geological characteristics of the oldest lunar crust, preserved on the back of the moon, can be developed for the first time in the world to establish a comprehensive geological profile and evolution model integrating topography, topography, and material components, and obtain new recognition of the history of the early evolution of the moon. (Hang Tianren)