BBC: The Moon

1. Mystery of the origin of the moon

Scientists have put forward three theories about the origin of the moon, all of which are flawed, but the "Apollo" project helps to prove that the theory that seems to be the least possible is the best one. Some scientists believe that the moon ball was formed with the earth from a mass of cosmic dust 4.6 billion years ago. Another theory holds that the moon is the "child" of the earth, maybe it was "dug" out from the Pacific Ocean. However, the results of "Apollo" exploration on the moon show that the structural components of the earth and the moon are very different, and some scientists have put forward another hypothesis, that is, the "capture theory". They believe that the moon accidentally broke into the earth's gravitational field and was locked in its current orbit. However, it is quite difficult to explain the mechanism of this process theoretically. Therefore, all the above three theories are untenable. As Dr. Robin Brett said, "It is easier to explain the absence of the moon than to explain its existence."

2. Mystery of Moon Age

Surprisingly, it is found that 99% of the rock samples brought back from the moon are older than 9% of the oldest rocks on the earth. The age of the first rock Armstrong picked up after landing in the Silent Sea was 3.6 billion years old. Other rocks are 4.3 billion, 4.6 billion and 4.5 billion years old-almost as old as the earth and the solar system itself. The oldest rock on the earth is 3.7 billion years old. In 1973, a 5.3 billion-year-old moon rock was determined at the World Moon Symposium. What is even more puzzling is that these ancient rocks are all taken from what scientists think is the youngest area on the moon. Based on these evidences, some scientists suggest that the moon was formed in interstellar space long before the formation of the earth.

3. The age of lunar soil is bigger than the age of rocks.

The ancient rocks on the moon have made scientists helpless. However, compared with the soil around these rocks, the rocks are still young. According to analysis, the age of soil is at least 1 billion years older than that of rock. At first glance, this sounds impossible, because scientists believe that these soils are formed after rocks are crushed. However, after determining the chemical composition of rocks and soils, scientists found that these soils had nothing to do with rocks and seemed to come from other places.

4. Mystery of the Moon's hollow ball-like sound when a huge object attacks the moon

During the Apollo exploration, the abandoned rocket's third thruster will bang into the moon's surface. According to NASA's documents, "every time this noise sounds like the sound of a big bell." When the lunar lander landed on the plain with a particularly dark color, they found it very difficult to drill holes on the surface of the moon. After analysis, soil samples were found to contain a lot of rare metal titanium on the earth (it was used in supersonic jets and spacecraft); Other hard metals, such as zirconium, iridium and beryllium, are also rich in content. Scientists are puzzled because these metals will only blend with the surrounding rocks at a very high temperature-about 45 degrees Fahrenheit.

5. Mystery of Stainless Iron

Moon rock samples also contain pure iron particles, which scientists think are not meteors. Scientists in the Soviet Union and the United States have also discovered an even stranger phenomenon: these pure iron particles have not rusted after being placed on the earth for seven years. In the scientific world, pure iron without rust is unheard of.

6. Mystery of Moon Radioactivity

It is also an amazing phenomenon that the 8-mile-thick surface of the moon is radioactive. When Apollo 15 astronauts used thermometers, they found that the readings were surprisingly high, which showed that the temperature of the heat flow near the Apennine Plain was really high. A scientist exclaimed, "God, this land is about to melt! The core of the moon must be hotter. " However, it is puzzling that the temperature in the heart of the moon is not high. This heat is emitted from a large number of radioactive substances on the surface of the moon, but where do these radioactive substances (uranium, thallium and plutonium) come from? If they came from the center of the moon, how did they come to the surface of the moon?

7. Mystery of a lot of water vapor on the dry moon

The first few lunar explorations showed that the moon was a dry celestial body. A scientist once asserted that it was "1 million times drier than the Gobi Desert." The first few times of Apollo program failed to find any traces of water on the surface of the moon. However, Apollo 15 scientists have detected a water vapor mass with an area of 1 square miles on the surface of the moon. Red-faced scientists argued that this was caused by the leakage of two small water tanks abandoned by American astronauts on the moon. But how can such a small water tank produce such a large piece of water vapor? Of course, it won't be astronauts' urine-it will be sprayed directly into the sky of the moon. It seems that the water vapor comes from the interior of the moon. 8. the mystery of the glassy surface of the moon

Apollo astronauts found that the surface of the moon was covered with a glassy substance in many places, which showed that the surface of the moon seemed to have been burned by a fiery fireball. As a scientist pointed out, "The moon is covered with glass. "Experts' analysis proves that this glassy material is not produced by the impact of a huge meteorite, and some scientists believe that it is the result of the explosion of the sun-a kind of miniature nova state.

9. Mystery of the Moon's Magnetic Field

Earlier exploration and research showed that the moon had almost no magnetic field, but the analysis of moon rocks proved that it had a strong magnetic field. This phenomenon puzzled scientists, and Dr. Paul Gaster declared: "The rocks here have very strange magnetism ... which is completely unexpected. "If the moon once had a magnetic field, it should have an iron core, but reliable evidence shows that the moon can't have such a core; And it is impossible for the moon to get a magnetic field from other celestial bodies (such as the earth), because in that case, it must be very close to the earth, and then it will be torn to pieces by the gravity of the earth.

1. Mystery of the "material gathering point" inside the moon

In p>1968, the probe flying around the moon showed for the first time that there was a "material gathering structure" under the surface of the moon. When the spacecraft flies over these structures, due to their great gravity, the spacecraft's flight will be slightly lower than the prescribed orbit, and when the spacecraft leaves these structures, it will accelerate slightly, which clearly shows the existence of this material focusing structure and their huge mass. Scientists believe that these structures are like a bull's eye, made of heavy elements and hidden under the "sea" on the surface of the moon. As a scientist said, "It seems that no one knows how to deal with them. "