[refuting the rumor] you are worried too much about the mysterious space!

In the early morning of December 17, the chang’e-5 spacecraft with lunar samples landed safely in a predetermined area, making China’s space industry a big step forward. But for the mysterious space, we ordinary people still know very little, inevitably fall into misunderstanding. Today, let’s talk about the widely spread space rumors, and deal with them scientifically with you. < / P > < p > in response to the rumor that “China’s lunar sampling program costs a lot of money”, Pang Zhihao, chief science communication expert of China’s space exploration technology, said that China’s recently implemented chang’e-5 mission is an unmanned exploration mission built around the main goal of lunar sampling return. China’s lunar exploration project has been progressing step by step. The development from unmanned to manned is more scientific and the cost is much lower. < / P > < p > according to the relevant person in charge of the lunar exploration and space engineering center of the National Space Administration, the Chang’e-1 project, which started from scratch, costs only 1-2km of Beijing’s subway, while the cost of chang’e-4 is similar to that of building a 1km subway. In the aspect of funds management, we should pay attention to cost saving, but the money we should spend is not saved blindly. Instead, we should spend every cent on the edge of the sword and seek the maximum benefit through technological innovation. < p > < p > in the movie, the astronaut accidentally lost contact with the ground relay. It is understood that the relay device is similar to the transfer station. When the spacecraft can not communicate with the ground directly, it is generally necessary to transmit signals through relay mode to maintain the communication between the ground and the aircraft. Generally, there are about 20 different antennas on the spacecraft, which are installed in different positions on the spacecraft. A broken antenna may have a great impact on communication, but it will not make the whole spacecraft lose contact with the ground. Unless the core communication system is damaged, it may lead to complete loss of communication. < / P > < p > it is said that “when the super moon appears, the gravity of the moon will increase much more than usual, which will affect the earth’s plate, thus inducing large-scale earthquakes, volcanic eruptions, tsunamis and other natural disasters”. In January last year, the related rumors once triggered a heated debate. With recent rumors, China has made new progress. < / P > < p > in fact, the super moon is a normal astronomical phenomenon. Usually, when the moon is closest to the earth and happens to meet the full moon, it will appear. At present, there is no evidence that the Earth Moon distance is related to earthquakes or volcanic eruptions. Even if there are volcanoes and earthquakes, it is also due to the earth itself. The earth surface lithosphere solid tide, ocean tide liquid tide are the result of the gravitational interaction between the earth and the moon, such activities are carried out every day, there is no super moon will lead to earthquakes and other natural disasters. < p > < p > in 1969, the lunar seismograph installed on the surface of the moon by Apollo 12 observed the vibration signals related to the lunar landing activities, and the vibration lasted for 55 minutes. This phenomenon led people to imagine that the moon is hollow. In addition, the overall density of the moon is much lower than that of the earth, which also leads to the speculation about “hollow moon”. < p > < p > the Saturn 5 rocket carrying Apollo 11 spacecraft was photographed on May 20, 1969. Photo source: the so-called Apollo moon quake experiment of china.com is only based on the signal sent back after passing through the shallow surface of the moon. It does not go deep into the interior of the moon at all. It does not mean that the moon is hollow, or that it does not reflect any internal structure of the moon. The density of the moon’s crust, mantle and core is increasing from the outside to the inside. There is no saying that the density of the moon’s core is lower than that of the moon’s mantle. Theoretically speaking, mercury, Venus, earth, Mars and the moon are becoming more and more dense from the outside to the inside, so there can be no “hollow” situation. Therefore, there is no scientific basis for the theory of hollow moon. Counterpoint announced top 5 best selling models: domestic iPhone 11 tops the list