【Deep Starry Sky-19】

Jiang Pingce used the coordinate system to take everyone around the planet at the fastest speed. His skills were cooled down every half an hour, and it was not until 6 pm that day that everyone returned to the original landing position. Jiang Pingce quickly calculated the data: "According to our speed and time, the distance around the planet is 800 kilometers."

Qin Lu said: "I remember that it takes more than 40,000 kilometers to go around the earth. This planet is only 800 kilometers long. That is to say, the earth is 50 times longer than it?"

Only one-fifth of the volume of the earth sounds very small, but the problem is that about 70% of the surface of the earth is ocean, and land accounts for less than 30%, and this planet has no ocean, they circled around a The whole circle, the entire planet's surface is charred black soil, and covered with endless mountains.

Therefore, the area they need to search is not small.

The next moment, Jiang Pingce said the exact result: "The circumference is 800 kilometers, the diameter is 254.77 kilometers, and the surface area of ​​the sphere is 203,810 square kilometers."

Qin Lu thought about it carefully, and said, "It's almost the total area of ​​Jiangsu and Zhejiang provinces?"

Everyone has no concept of specific data, but Qin Lu gave an example, and the data immediately became intuitive. Liu Zhaoqing held down his temple with a headache, and said, "There are only 18 days left. It's a bit difficult to search a huge area equivalent to the area of ​​two provinces in a carpet style!"

Xu Yishen said with a smile: "Actually, it's not difficult, we have Qin Lu, 12 plate transpositions per day is 6 kilometers, and it only takes 30 seconds. In the coordinate system of Pingce, it takes half an hour to fly at high speed in the air. The speed of Xingwen has accelerated the whole group by 5 times. Our 183 Action Team is equivalent to traveling on a high-speed train!"

Ke Shaobin asked, "Can we fly the aircraft to search?"

Zhuo Feng shook his head: "It shouldn't. I need to use a magnet to collect ores, but the aircraft is likely to crash due to the influence of the magnetic field."

Yue Xingwen looked back at his younger brother and said, "Xiao Nian, build a building here and hide the aircraft. We will divide the entire planet into four areas according to Pingce's method of dividing the surface, and search them one by one."

Everyone immediately divided their work and cooperated, Zhang Xiaonian was in charge of building the base, and Jiang Pingce took everyone's location as the origin, and drew four straight rays in four directions, extending into the distance.

Everyone was busy until 8pm.

Jiang Pingce said: "Qin Lu use his skills first, and search the first area."

Qin Lu took out the globe and led everyone to move forward quickly.

Along the way, Zhuo Feng used magnets to collect the surrounding ore, and the collection rate of the ore in the floating frame was also increasing. After Qin Lu used up 12 plate transpositions, the collection rate also became 15/100.

With so many stones, it would be heavy to carry on your back. Lin Manluo made a basket out of vines, put all the collected ore into it, and carried it away with Qin Miao. The two girls were carrying a large pile of stones and looked tired. In fact, Zhuo Feng used his skills to reduce their weight, and the two of them felt no pressure at all, just like they were lifting a bunch of feathers.

After rectification, Jiang Pingce used the coordinate formula to lead everyone forward. Zhuo Feng used magnets to search for targets along the way, and when he had thoroughly searched the mountain range, the collection rate also became 20/100.

Ke Shaobin looked at the ore in the basket and said, "We went well today. In just one day, we collected 20 mission targets. There are 18 days left, which is more than enough!"

Xin Yan said: "Don't be too happy. The mission objective requires us to 'collect' 100 pieces of ore, that is to say, even if we collect 99 pieces, there is still one piece left, and we won't be given 99 pieces if we don't collect them all. points, but 0 points."

Xin Yan's words can be said to hit the nail on the head.

Even if the collection progress in the early stage is smooth, it is stuck at 99% of the progress in the end, and it is possible to give up all efforts for a stone. Therefore, collecting 20 yuan on the first day is not a happy thing.

Ke Shaobin looked at him helplessly: "Xin Yan, don't you like splashing cold water?"

Xin Yan did not refute, and said calmly: "I'm just stating the facts. We can't relax until all 100 mission targets are collected."

Ke Shaobin shrugged: "Okay, you're right. However, Brother Zhuo immediately thought of using a magnet to help, which saved a lot of effort. The first day went well, which is also a good sign!"

Yue Xingwen glanced at the two who were bickering and said with a smile: "The more we searched in the early stage, the less pressure we will have later. We try to increase the collection rate to more than 80% in the first few days, and finally check the gaps and fill the gaps. It's already 11 o'clock in the evening, let's rest first and continue tomorrow."

There is no difference between day and night on the barren planet, but everyone is really tired from working all day. Zhang Xiaonian built a base on the spot, and everyone stayed together all night, and the search continued at 8:00 the next morning.

There is Jiang Pingce to formulate the path and direction, don't worry about missing or repeating, he calculates the scope of each search very accurately, and after another day, the collection rate of ore has reached 40%.

On the 13th day, the task collection rate was 55%;

On the 14th day, the task collection rate was 70%;

On the 15th day, the task collection rate was 80%...

The boring and repetitive collection tasks for several days in a row made everyone tired.

Start every morning at 8am, use magnets to collect nickel ore on the indistinguishable-looking charred mountains, open your backpack when you're hungry, and grab some biscuits or cans...

Repetitive tasks are the easiest to get bored of.

By the 16th day, everyone's spirits were a little numb, and the repeated movements made everyone have the illusion that they were "robots" with programmed programs.

On the 16th night, the collection degree rose to 85.

Everyone sat in the temporary base built by Zhang Xiaonian to eat, and Ke Shaobin complained while eating: "The collection rate is getting slower and slower. At the beginning, it was 20 yuan per day; on the third and fourth days, it was 15 yuan. , 10 yuan on the fifth day, and on the sixth day today, only 5 yuan was found."

20, 20, 15, 15, 10, 5, the ore they collected is indeed gradually decreasing.

Yue Xingwen thought about it and said, "We still have 13 days, don't worry."

But the progress of the next task made everyone have to be anxious——

On the 17th day, they searched an area of ​​nearly 20,000 square kilometers from 8:00 a.m. to 11:00 p.m., but they couldn't find even a single mission target!

Looking at the stagnant task progress of the floating frame, Yue Xingwen said helplessly: "Maybe there is no ore in this area, let's look for it tomorrow."

Day 18, the same ending as the day before - still nothing.

The prompt in the floating box always stays at: 85/100 ore collected, no change.

Seeing Yue Xingwen frowning slightly, Jiang Pingce patted his left hand lightly: "Don't worry, I have only searched three parts of the partition I set, and there is a whole area of ​​nearly 50,000 square kilometers. We have never Been there."

Yue Xingwen nodded: "Well, the rest should be in the fourth area, let's talk about it after searching."

He believed that the area set by Jiang Pingce would not be wrong. They did not miss an inch of land. Since 85% of the three areas were searched, the remaining 15% was likely to be in the fourth area, and the time was completely in time. .

The next day, Jiang Pingce led everyone to continue searching for the last area. To the delight of the students, on this day, everyone harvested 10 pieces of ores one after another, and the collection rate finally reached 95%.

The anxiety of getting nothing for two consecutive days was swept away, and everyone thought that the remaining stones must be all in this area.

But right after that, the library slapped them in the face again.

Next, another three consecutive days of zero harvest!

At this time, they had already searched all areas of the entire planet in a carpet-like manner. Zhang Xiaonian and Ke Shaobin even used a laser mapping instrument to draw an accurate topographic map of the mountains on their laptops.

Ke Shaobin wondered: "How come there are only 95? The remaining 5 should not be missed!"

Everyone looked at each other.

Yue Xingwen took a deep breath and said as calmly as possible: "It took us 12 days to search the four areas, and there are still 7 days left. It will be too late to search again."

The most feared is this result.

They thought that they had carefully searched all areas on the planet, but in the end they were missing a few pieces. It was definitely too late to search from the beginning, and they didn't know where they were missed.

As long as the mission objectives are not met, they will not be able to pass this class!

Before the thrilling avoidance of cosmic wormholes, cosmic sandstorms, and even an emergency landing in an escape pod, and survived the pursuit of alien monsters... What's the use? !

The final task could not be achieved, and everyone still had to fail the class collectively.

At this moment, a trace of depression rose in everyone's heart.

No one doubted that Jiang Ping planned to divide the area wrong, and everyone was convinced that they had searched every corner of the planet in the past 12 days, and did not go through repeated paths, nor did they miss any areas. What's more, Zhuo Feng's magnified version of the magnet can attract ores from super long distances. Even if they are missed by the naked eye, the magnet will not be missed, right?

Where is the problem?

Jiang Pingce frowned. He stared at the graph drawn on Ke Shaobin's computer—

Every area on the planet has a large number of continuous mountain ranges. The shapes, trends, and heights of these mountain ranges are different from each other, and they look extremely chaotic and irregular.

Jiang Pingce closed his eyes and tried to construct a three-dimensional image. Gradually, a planet appeared in his mind, and countless mountains rose up on the planet, like blood vessels that provide nutrients to the entire planet...

Suddenly, an intersection appeared in front of his eyes.

Jiang Pingce opened his eyes suddenly, looked at the computer screen, and said, "Connect all the floor plans of these four areas to reconstruct the three-dimensional modeling."

With accurate surveying and mapping data, it is not difficult for Ke Shaobin to use a computer to make a three-dimensional model. He quickly tapped the keyboard with both hands, and soon, a brown three-dimensional planet appeared in front of everyone.

Jiang Pingce pointed to several mountain ranges in a row, and said: "If these three mountain ranges are extended in reverse, they will have a common intersection. The same phenomenon has also occurred in other places, that is to say, assuming that these mountain ranges are not interrupted, they should be from the same Originated from a location."

Qin Lu's eyes lit up: "I see! Many mineral veins on this planet have the same origin, but some mountain ranges have been razed to the ground during thousands of years of wind erosion. To our naked eye, these mountains are It is interrupted, but as long as they are continued in reverse, the real origin can be found?"

Jiang Pingce nodded: "Yes. Those on the surface look like the origin of the flat ground. If you dig deeper, you may be able to find more ores hidden underground."

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See you tomorrow~