Peng Feng led the prospecting team to dig more than 20 exploration points in half a month.

They went deep into a large crater on the far side of the moon and continued to collect samples of the rock layers of the moon's crust.

Peng Feng encouraged: "Everyone hurry up, this is the last exploration point, we can return to the lunar advance base after collecting samples."

They began to follow the previous procedures to collect the lunar rock formations at this exploration site.

Wang Zhihua was in charge of debugging the ruler of the equipment, and he thought that after his work was over, he would complete his service plan on the moon, and he could apply to return to Earth.

Now there is a struggle between whether he will return to Earth or continue to work at the Lunar Forward Base.

Wang Zhihua was a little absent-minded, and directly set the ruler of the machine in accordance with the previous operation process.

Time passed slowly, and the drilling machine trembled violently and soon stopped.

When Peng Feng saw this situation, he immediately shouted: "Wang Zhihua, what are you doing, how can you follow the scale set last time, the last time we collected on a mountain peak, this time it was at the bottom of a crater, and the difference in the thickness of the earth's crust can be 5 kilometers."

The bottom of the lunar crust is very dense and can easily damage the rig. ”

When Wang Zhihua saw the damage to the drilling rig, he began to think that it was his mistake and just wanted to apologize.

Suddenly seeing the parameters of the depth of the drilling rig, he immediately retorted: "Captain Peng Feng, you have misunderstood!"

That's right, there is an altitude difference of 5 kilometers between the last collection site and here according to the lunar plane.

But we took a 20-kilometer sample of the lunar crust, and now the rig has just drilled to 18.9 kilometers, and it has not reached the scheduled 20 kilometers at all.

Our depth reference is measured by the height of the probe ground, not by the height of the lunar plane. ”

Peng Feng carefully checked the data, and he found that what Wang Zhihua said was right, and he said with some embarrassment: "I didn't investigate carefully just now, I misunderstood you just now."

Without reaching a depth of 20 km, how can the rig suddenly break. ”

As they spoke, the rest of the team had already pulled the damaged rig up.

Peng Feng looked at the impact situation, and the blade made of high-density material in front of him had been completely polished.

After the blade is polished, the rig can no longer cut the rock, causing it to get stuck in the crevices of the rock and directly burn the rig components.

Peng Feng looked at the collected lunar crustal rock samples, and he said lightly: "Fortunately, the crustal samples have been collected, and the damage to the drilling rig can be reported, and our work is complete."

On January 11, 2028, Zhou Yu was learning about the mineral situation of the moon at the Xinghuo Science and Technology Research Institute.

Huang Ke is reporting the scientists' statistical results to Zhou Yu.

"Mr. Zhou, we use advanced lunar resource exploration satellites and space shuttles to repeatedly explore lunar resources.

We have sent another 76 prospecting teams to sample rocks from the lunar crust, and scientists have analyzed samples of the lunar crust at thousands of sites.

Now we have all the resources on the moon at our disposal.

There are not many valuable minerals on the moon, and most of the elements that exist on the earth are found on the moon, but they are not enriched together to form veins.

There are only 43 iron ores, 27 copper mines, 8 zinc mines, 5 silver mines, and 2 gold mines with reserves of more than one million tons.

Because the moon is relatively expensive to mine, they are extremely valuable veins.

Other veins are more expensive to mine, so it is better to send a space shuttle to mine in the asteroid belt. ”

Zhou Yu smiled and said: "This is already very good, now send intelligent robots to mine these valuable ore veins, and leave the other ore veins to future people."

When the technology matures, we can resell those veins with relatively low reserves at a good price. ”

Zhou Yu is very satisfied with the discovery of large ore veins on the moon, especially the discovery of precious metals such as large gold deposits.

Gold and silver are two metals that are extremely useful in modern industry, but they are somewhat expensive.

Now you can mine and refine the largest reserves of these metal ores, and you can save a lot of costs.

"Mr. Zhou, scientists from our company analyzed lunar rock samples and found some strange phenomena." Huang Ke said a little mysteriously.

"What are the strange phenomena, and the occurrence of strange phenomena is a good thing, and cracking these phenomena may bring about certain technological advances.

There is nothing mysterious in the world, and now we feel mysterious, it's just that technology has not yet developed to this extent to explain this phenomenon. Zhou Yu asked with some excitement.

When the ancients saw a video playing on their mobile phones, they must have thought it was a mysterious phenomenon.

If some future technology appeared on the current earth, the earthlings would definitely think that it was a mysterious phenomenon.

It is not terrible to have mysteries, but it is terrible to worship them as superstitions.

Huang Ke saw Zhou Yu's expectant eyes, and he immediately said what they introduced when chatting with the scientists.

"Mr. Zhou, in order to detect the existence of veins in the lunar crust, we have sent a number of prospecting teams to collect many specimens of the lunar crustal rock formations.

The density of rock specimens brought back is much greater than that of Earth's rocks.

The density of lunar rock specimens is common, and their density varies, but they are all denser than those on Earth.

The total mass of the Moon would be much larger than the current calculations, and its gravitational pull would be correspondingly stronger.

Considering that the surface of the moon is much closer to the center of the moon than the surface is to the center of the earth, and combined with its total mass, the gravitational force will be much greater than we think.

However, the gravitational pull of the Moon is only one-sixth of that of the Earth's surface gravity, and the mass of the Moon measured by gravity is much smaller than that of the Moon as estimated by the density of lunar rock specimens.

As if the gravitational pull of the moon has nothing to do with its density, mass.

This is of course impossible, and scientists speculate that the density of the Moon is extremely unevenly distributed.

There are many gases or cavities in the lunar crust that can cause this phenomenon.

However, what exactly causes the uneven density of the lunar crust remains to be tested in the future. ”

Zhou Yu heard Huang Ke say this, and he felt that there were not many secrets hidden in it.

It is very normal for the parts of the celestial bodies to have different densities.

For example, the magma in the Earth's interior is certainly different in density from the Earth's crust.

The density of the center of the sun is also very different from the density of the surface of the sun, which is a very normal phenomenon on the planet.

Even if the difference between the moon is a little large, it is within a reasonable range.

"There's nothing special about it. It's not worth our constant tracking, where the lunar rock samples are placed, I'll take a look. Zhou Yu asked.

Huang Ke immediately replied: "Mr. Zhou, he is in the Celestial Environment Laboratory, we have collected too many lunar rock samples, and we are going to donate some to other scientific research institutions."

Scarcity is expensive, and now there are too many lunar rock samples from Xinghuo Technology, and the value has dropped dramatically.

These lunar rock samples are kept in the laboratory and cost a lot of money every day.

Huang Ke had long wanted to get rid of this hot potato, and when he saw that Zhou Yu was interested in lunar rock samples, he immediately took him to the laboratory where lunar rock samples were stored.

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