It is said that on the day that Chang'e-6 successfully returned to the mainland, the American media soon published an article that "China has taken the lead in the space race."
Coincidentally, when NASA Administrator Nelson reported to Congress, he was extremely worried: "I am worried that the Chinese will take the lead in front of us." ”
This sentence is worth pondering, in addition to the meaning of space competition imagined by the United States, is there any ulterior secret?
In fact, whenever the mainland's lunar exploration program has repeatedly achieved good results, when the world gradually sees the truth about the moon through the Chang'e series, the United States always shows an inexplicable sense of anxiety, especially with the gradual deepening of research, the controversy about the US moon landing is getting louder and louder, what is going on?
The Moonshot Contrast Effect
Looking back at the Apollo moon landing series in the United States, only Apollo 11, 12, 14, 15, 16, and 17 successfully landed on the moon. In fact, the controversy over the US moon landing is most ferocious and it is their own people who are most ferocious.
There is a conspiracy to defraud and defraud funds, and a Hollywood studio moon landing said that the most eye-catching rumor is that there was a person holding a Bible, and Aldrin, one of the Apollo 11 astronauts, was forced to swear that he had really gone there, but he was beaten by the other party.
Of course, the rumors are not substantiated, but as the continent has studied the moon more and more, it seems that there is a new comparison.
Comparison of the first lunar soil In 1978, our country received a precious lunar soil gift from the United States, although it was only 1 gram, it was completely courteous and affectionate.
However, the difference in comparing the 1 gram of lunar soil from the United States with the lunar soil brought back by Chang'e-5 is incredible.
This is mainly reflected in the difference in mineral and chemical composition, the composition of the lunar soil in the United States is single, and the two minerals of monoclinic feldspar and volcanic glass are more than 2/3.
The Chang'e-5 sample has a wide variety of lunar soil minerals, including olivine, plagioclase, pyroxene debris, etc., and there are 24 kinds that can be ranked as serial numbers.
Specifically, the Chang'e-5 lunar soil samples have relatively high pyroxene content, low plagioclase content, high iron and thorium content, and relatively low aluminum and calcium content, but the content of titanium is not much different.
According to the results of gamma-ray spectroscopy, Chang'e-5 lunar soil contains more highland sputters and basalt samples. Not only that, scientists have also discovered a new mineral Chang'e stone in the 140,000 lunar soil particles of Chang'e-5.
As for the reason for these differences, it is possible that the two samples were taken from different lunar regions, and the Chang'e-5 landing site is in the basalt plain northeast of the lunar storm ocean, which is considered to be one of the youngest basalt rocks on the moon.
The U.S. sample is a small piece knocked out of the sample retrieved by Apollo 17, and Apollo 17 is a sample from the southeast landing area of the moon's Chenghai and belongs to the high-titanium lunar sea basalt.
This is equivalent to taking a stone from Tibet and comparing it with the stone from Hangzhou, then their composition will be somewhat different, which can be simply understood as the different environmental and geological conditions in different regions, and from this point of view, it can also explain the difference between the two lunar soil samples.
Comparison of the second national flag In addition to digging on the surface of the moon, Chang'e-6 also independently displayed our five-star red flag in a dynamic form on the far side of the moon for the first time.
According to relevant information, this red flag uses basalt with a similar composition to the lunar soil as the core material, which can withstand high temperatures of 150 degrees Celsius, can withstand low temperatures of minus 196 degrees, has strong corrosion resistance, or may be stored on the surface of the moon for a long time.
Compared with the national flag that we left behind that "will hardly disappear" and does not move at all, the flag of the Apollo moon landing in the United States can be described as "ill-fated" and controversial.
Some people believe that not only did the American flag float on the windless moon, but the shadow of the flag was not parallel to other devices. According to relevant information, the Apollo American flag looks fluttering, but it is actually made of an internal T-shaped skeleton, and the inconsistent direction of the shadow may also be a problem with the angle of light intake.
At first glance, these explanations have also completed logical self-consistency, and perhaps if we want to truly verify the truth of the matter, we can only wait for the astronauts to take a look at it for themselves after the success of our manned lunar landing project, but it is also a big problem that the American flag will not be there at that time.
It is said that the American flag was made of double-layer polyester, that is, polyester fiber, although this material has a certain strength and elasticity, it can also withstand a temperature of about 130 degrees, but the moon has been exposed to ultraviolet radiation for a long time, and the high temperature and various cosmic ray environments, the United States planted the Stars and Stripes in the lunar soil is as good as ever, or has it long been turned into ashes, which is indeed an unsolved mystery.
Comparison of the third lander Chang'e-6 drove into the earth at an ultra-high speed of Mach 31, which is beyond the reach of missiles, and decelerated to 7 kilometers per second through "water drifting", pneumatic deceleration generated a lot of heat, and the local heating of the cabin exceeded 2000 degrees.
But the burning situation of the Apollo series spacecraft is not so serious, and it is also from 380,000 kilometers of space, how can there be an almost scorched, almost intact situation.
First of all, both Chinese and American spacecraft have adopted the concept of "ablation" thermal insulation, which uses the vaporization of cautery materials to take away a large amount of heat to protect the capsule.
So theoretically, after the Apollo spacecraft returned, the capsule would also show traces of burning, which was not obvious, and it may be related to the shape of the spacecraft.
For example, the spacecraft of the former Soviet Union, similar to a large round ball, is not only unstable but also easy to rotate, but if you choose to make the shape of the spacecraft a stable cone, it will inevitably withstand extremely high temperatures.
Generally speaking, the part that is in direct contact with the air, that is, the bottom of the spacecraft, is subjected to the highest temperature, and from this point of view, American spacecraft usually lay more insulation materials on the bottom, and in order to keep the side temperature low, the tilt angle of the spacecraft cone will also be larger, but the internal space is greatly compressed.
However, the new generation of spacecraft such as Chang'e-6 has a smaller tilt angle than Apollo and a large internal space, which is a reflection of our technological improvement.
The Apollo spacecraft also uses the Chang'e-5 deceleration method, and the spacecraft itself has a large tilt angle, so it stands to reason that the burning at the bottom of the capsule should be more serious, but this is not the case in many display photos, is it a problem with the shooting angle?
In fact, it is the controversy of the world about the United States landing on the moon, but also why it was able to carry people back then, but now it can't, according to NASA itself, it belongs to the technology lost, which is very interesting, why the nuclear bomb technology, aircraft carrier technology has not been lost, but the manned moon landing technology has been lost? It seems that only when we go further into the moon landing will the world see more of the truth.