The moon is the only natural satellite of the earth, which has accompanied the earth for billions of years. Although the origin of the moon has not been determined yet, more scientists believe that it may have originated from a great earth impact, that is, in the early stage of the earth’s formation, a Mars sized star hit the earth, and part of the earth’s material was hit out and collided with the star Parts of the body combine to form the moon.
Scientists have found a lot of evidence about the theory of the great impact of the moon through the meteorites brought back from the moon. Therefore, the moon may be a part of the earth. If it was once a part of the earth, the lunar soil may also have many similarities with the earth’s soil.
As we all know, the earth is a living planet, 71% of which is the ocean. It can be said that the earth is a planet rich in water. Does the lunar soil also contain water? In the early exploration of the moon, including the lunar soil brought back by Apollo landing on the moon, it was found that there was no water in the lunar surface soil, that is to say, the moon may be a planet without water.
However, with the continuous progress of human space science and technology, more and more probes begin to explore the moon, and scientists have more and more knowledge about the moon. The view that the moon has no water in the past has been gradually overturned. In the recent journal Nature Geoscience, scientists published the latest knowledge about water on the moon.
In the paper, through long-term exploration and experiments on the moon, scientists found that the moon is not a completely dry and waterless planet. The surface of the moon is generally dry, but the lunar soil under the surface of the moon (the depth is only about 8 cm) contains about 0.05% water. The reason why the soil brought back by the early Apollo lunar exploration program did not contain water was that it mainly collected the soil from the outermost layer of the moon. If the soil below 8 cm of the lunar surface could be taken, the situation would be completely different.
So how do scientists determine that the surface of the moon contains water less than 8 cm? It turns out that scientists discovered this by observing the impact of meteorite on the lunar surface. When a meteorite impacts the lunar surface at high speed, it will evaporate at the moment of impact due to high temperature. At the same time, the impact will produce a strong shock wave to spread in the lunar soil. If an impact is large enough, the shock wave may cause cracks in the surface dry powdery lunar soil layer and release water molecules from the lower moist aquifer.
With the help of scientific equipment carried by NASA’s lunar atmosphere and dust environment probe (LADEE), scientists have detected abnormally high moisture content in the exosphere of the moon periodically, which is so much that the equipment installed on the spacecraft feels like a sponge, absorbing the moisture all the way during the flight.
According to scientists’ estimation, meteorite impact on the surface of the moon causes the moon to lose about 220 tons of water every year, and the aquifer of the moon is covered by a layer of dry lunar soil with a thickness of about 8 cm. If the meteorite impact did not expose the water, we may never know that the moon is also a planet with water. So where does the hidden water from the moon’s shallow surface come from?
Scientists believe that the water hidden under the surface of the moon may have existed at the time of the initial formation of the moon. As for their sources, scientists have no final conclusion at present. Some scientists believe that the initial sources of water on the moon may be related to the water brought by the injection of solar wind particles and the impact of water rich meteorites, or they may be a combination of the two.
After all, the moon may be a part of the earth, the earth is rich in water resources, and there is also a lot of water content under the surface of the moon. This may not be a coincidence, but there is some connection between them. Now the scientific community thinks that the earth’s water resources may come from the early comet impact, but there is no definite answer in the scientific community. Some scientists have other views on the source of the earth’s rich water resources, and think that the earth’s water may come from the earth itself.
Now, scientists have found that there is abundant water under the surface of the moon, which is of great significance for the future exploration of lunar geology and the understanding of subsequent evolution. The reason why there is no water in the outermost layer of the lunar surface may be related to the absence of atmosphere on the moon. As we all know, the moon has no atmosphere, and its surface is directly exposed to space. Under the influence of solar wind and other cosmic radiation, it is difficult for water to exist on the surface of the moon, which is why there is no water on the surface of the moon.
However, outside the surface of the moon, the solar wind can not directly affect the water formed in the early days of the moon. From this, we can get a guess that in the early days of the moon, it might also be a planet with very high water content. There might be a lot of water on the surface and under the surface of the moon. However, the moon did not form an atmosphere and there was no protection of the atmosphere. The water on the surface of the moon was slowly carried away by the solar wind, and only the water under the surface of the moon remained.
The discovery of shallow water on the moon is of great significance for human beings to build bases on the moon and build a lunar city to live on the moon. Sooner or later, human civilization will migrate to space. No matter which planet humans migrate to, water resources are necessary. Without water, human beings will not survive. It was thought that there was no water on the moon. If we want to immigrate to the moon in the future, we have to transport water from the earth, which will limit the number of people immigrating to the moon.
But now it is found that there is a lot of water in the moon, so for future human migration to the moon, water resources can be solved, and groundwater can be collected directly from the moon for people’s life and work. It can be seen that although human beings have a lot of knowledge about the moon, there are still many unknown secrets waiting for us to dig and explore.
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