Tang Yue and the old cat drove the Martian stray dog around Kunlun Station, marking and sampling the soil under their feet in turn, as a means of transportation, the Martian stray dog is undoubtedly unqualified, but as a scientific research instrument, the Martian stray dog is probably the most complex and expensive geological exploration equipment ever made by humans.

Not counting the transportation costs, the cost of this battery car is as high as 400 million US dollars.

In addition to the head and power system, the money spent on stray dogs is mainly focused on the experimental cabin, which itself has no power, only four wheels, which can be dragged by the front of the car, and it integrates almost all the functions needed in the survey, from mapping to drilling to spectroscopy to hydrocarbon analysis, these sophisticated and expensive instruments are powered by the solar panels on the car, which can support a full range of field investigations.

Tang Yue sat on a chair, with a microscope and a computer screen on the workbench in front of him, and on the other side of the workbench was a row of glass dishes, containing soil samples.

"Is B3 finished grinding?"

The old cat stood on a rock outside the car, looked around, leaned down to take a sample of the soil, and then put a label on the glass.

"Sample B3 is grinding." Wearing a mask and goggles, Tang Yue used a pestle to mash the soil sample in the mortar, grind it evenly, and then push it under the lens of the microscope.

The old cat and Tang Yue have a clear division of labor, the old cat is responsible for driving and sampling, and Tang Yue is responsible for measurement and analysis while sitting in the experimental cabin.

Tang Yue took off the extravehicular spacesuit Mingguang armor, because he couldn't perform precise operations with such bloated clothes, the geological experiment module of the Martian stray dog is an airtight cabin, with two hatches, in this point it is different from the wheelhouse, so the crew in the experimental cabin can take off the extravehicular suit and only wear the cabin suit or even ordinary clothes for work.

However, there is no OGS system in the experimental cabin, and oxygen can only be provided by Mingguang armor.

"How many layers of masks are you wearing?" The old cat asked.

"Two floors."

"I think you should wear two more layers." The old cat said.

Tang Yue was stunned, "Why?" ”

"You know, the soil in front of you comes from Mars, and it's something that the immune system of life on Earth has never touched, which has taken hundreds of millions of years to evolve." The old cat replied slowly, "If you accidentally inhale this dust into the respiratory tract or mouth, and come into contact with the skin and mucous membranes, God knows if there will be any strange immune stress and allergic reactions?" ”

"For example, if the lining of the airway is rapidly edematous, blocking the airway and causing suffocation, you will burp in three minutes." "Or can it cause an abnormality in the immune system, an error in the recognition of lymphocytes, causing massive bleeding in the lungs, and you will burp in three minutes." ”

Tang Yue was silent for a moment, took off the helmet of the cabin suit and buckled it on his head.

The microscope magnified the sample powder hundreds of times, and under the high magnification, the original dark brown powder became brilliant and colorful, and the small particles of the crystalline polyhedra looked like quartz or diamonds.

"Tang Yue, how is the soil quality of this batch?" Mai Dong asked.

"I can't see it." Tang Yue shook his head, "You wait a moment, I'll send you the screenshot, you can see how it goes." ”

Tang Yue took a screenshot of the magnified results of the microscope and sent it to Mai Dong.

"Hmm...... Is this the third batch of samples on line B? ”

"Yes." Tang Yue nodded.

"Tang Yue, you see, these minerals under the microscope lens, these layered flakes are silicate compounds, mainly chlormorillonite, montmorillonite and muscovite, these gray and white particles are sulfate minerals, mainly gypsum, and finally these shiny things are calcite." Mai Dong gave him an analysis, "It is obvious that this is a gravel formed by the weathering of the rock, which has no water retention ability and is not suitable for growing tomatoes." ”

Tang Yue suddenly realized with a blank face.

He was at a loss because he didn't understand the names of the minerals.

It dawned on him because he knew that the soil could not be used to grow tomatoes.

However, Mai Dong's understanding of the Martian soil is a little beyond his expectations, this girl is a researcher of plants, could it be that when planting tomatoes, she also studied the soil quality on Mars?

Tang Yue does not have an in-depth understanding of Mai Dong's background, at most he knows that he graduated from Zhejiang University and holds a master's degree from the Chinese Academy of Sciences, and is going to go to Princeton or MIT for a doctorate. Although he knew that this girl was a scholar, he didn't know how many realms Mai Dong had cultivated to the level of a scholar, whether it was an introductory scholar and a perfect score in the crazy exam, or a supreme scholar, who could easily learn from China and the West?

Judging from the current situation, Mai Dong is very likely to be a scholar with a very deep hidden realm and a very high realm, and the possibility of the supreme bully cannot be ruled out.

"C1 sample."

The old cat opened the first hatch of the experiment chamber and put the glass dish in.

Tang Yue glanced at the soil in the glass dish, and thought to himself that it was probably a sample that could not grow tomatoes.

He grinds, dissolves in water, filters, and places the filtrate in the spectrophotometer's sample cell.

The results were not as he expected.

"Tang Yue, you look at this absorption spectrum, the highest peak is perchlorate ions, and the latter one is chlorate ions, these two indicators are very prominent, indicating that the soluble perchlorate and chlorate content in this sample are too high, too high salt ion concentration will destroy the osmotic balance of plant root cells, and this kind of soil is not suitable for growing tomatoes." Mai Dong shook his head.

C2 sample.

"Tang Yue, this won't work."

C3。

"Unqualified."

C4。

"It's not appropriate."

Tang Yue put aside all the samples that failed the review and then recorded the results in a notebook.

Tang Yuexin said that the horns of Mars are really not a place for people to live, and he can't even find a handful of soil that can grow tomatoes, and he immediately misses the fertile black soil on the earth, and he can harvest what he sows, planting a grain of millet in spring and harvesting 10,000 seeds in autumn, which is simply a selfless gift from nature and the source of human civilization.

In "Gone with the Wind", Scarlett's father once told his daughter that there is nothing in this world that is worth your life for, except for the land under your feet.

Now that I think about it, Hao Scarlett's father is really a philosopher, and he can see at a glance the central position of land in the history of human civilization.

How precious is a piece of land where tomatoes can be grown.

Now if someone had such a crop land, Tang Yue was willing to risk his life to get it.

"Tang Yue, how many samples have we taken now?" The old cat patted the bulkhead of the experimental cabin.

"Eleven."

"Did you find anything?"

"Yes." Tang Yue replied, "I found that the soil on Mars is not suitable for growing crops at all. ”

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(Author's gossip:

Recently, Chang'e-4 was launched, and the friends of the Goose Factory and China's aerospace industry engaged in publicity and distribution activities, and the author Jun also went to join in the excitement and helped a little. ）