"Brother Captain. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 After a long period of observation, Atlas concluded to Zhou Xin, "During this period of observation, it has been found that the stripes on the surface of the planet may move together in many numbers at the same time, but sometimes most of the stripes will remain motionless for a long time. Whether viewed as a whole or separately, the movement cycle of the stripes is not regular, and it seems to be somewhat fickle. ”

Hearing this conclusion, Zhou Xin was slightly disappointed, but then Atlas added: "However, although people have not summarized any rules from the movement cycle, there are still traces of the distribution of those moving stripes. As she spoke, she sped up on the screen about the changes in the sunny side of the planet that the probe had photographed in space some time ago. After watching this short few minutes of the picture, not only Zhou Xin, but most of the people in the command cabin saw some clues.

"The most frequent place where the streak movement occurs is at the edge of the planet's sunny side?" As soon as the video ended, Spred said thoughtfully, "The closer you get to the center, the less there is movement, and even the stripes in a large area in the center don't move at all." What's going on? ”

"Moreover, most of the stripes move in the same direction." Atlas added, "It's basically in the direction of the center of the sun, and it's almost impossible to move outward." ”

"Strange, what is the reason for this?" Zhou Xin felt a little puzzled, and then he asked, "Hasn't the probe on the surface of the planet encountered a moving stripe yet?" ”

"Since we released the probe close to the center of the planet's sunny surface, the probe flying to the high-risk area is still on the way to land." The little girl replied, "But it shouldn't be much longer, and in thirty minutes or so the probes should be able to land on the surface of the planet, and then we may be able to figure out why the streaks are moving so widely." ”

"You say—" Spred said with hesitation, "could the reason for the streaks move be related to the area of liquid we found earlier near the twilight line?" Seeing that everyone's attention was drawn to him, he continued to express his thoughts, "Both phenomena also occur at the edge of the sunny side of the planet. Although the streak movement phenomenon occurs more widely and is more distant from the twilight line than the liquid area. But can we think that this is an extension of the same natural phenomenon? Speaking of this, everyone present had a thoughtful look on their faces.

"Moreover, judging by the fact that the fringe movement phenomenon occurs less often than it gets closer to the center of the sunny side. I think it's very likely that the source of these anomalies is very close to the twilight line, or even the twilight line itself. Spred continued, and then he made a bold guess, "I'm afraid there is an anomaly near the dawn and dusk line, on the side of the shadow side that is temporarily unobservable, that we don't know about. ”

"It's not for nothing." After synthesizing Spred's judgment, Zhou Xin thought for a while and nodded, and then his tone revealed some doubts, "But, isn't the morning and dusk line just the dividing line between light and darkness on a planet?" What anomalies can this cause? Then he asked Dart, "Haven't you been wandering around space for a while?" Haven't you seen a similar planet? ”

"How is that possible?" Dart smiled wryly, "While it's true that we've wandered around space before, we don't actually visit many star systems. What's more, how many years ago did the ancestors travel through space, how can I possibly know where they have been. I think you should ask Atlas about it, she should remember what happened. ”

As soon as Dart's words fell, the little girl continued: "Indeed, just like Brother Dart's big brother said, in fact, there were not many planets that I visited with my grandfathers back then, at least in people's memories, I have not seen similar planets. Not only are they similar planets, but even people are the first time they've seen such a huge rocky planet like you, Captain's brother. You know, according to people's calculations, if the volume of the planet in front of us is larger, it is very likely that it will not be able to maintain its current shape, but will collapse under the action of gravity. ”

After a little more small talk, Atlas's tone suddenly became serious, "Brother Captain, one of our probes has landed in the area where the stripes are moving. ”

"Then let's see what's going on there." Hearing the little girl's report, Zhou Xin immediately said.

Before he could finish speaking, Atlas switched to the probe that had just landed. However, at the first glance of the picture, everyone felt a little disappointed.

In front of the detector's lens, there was another endless reddish-brown gravel field. No matter how carefully everyone in the command module observed, the image on the screen was still the same as the image they had seen from other probes before.

Zhou Xin expressed his doubts at the first time, and while raising his doubts, he also added, "Could it be that there is any difference between the ground here and other places that cannot be seen on the surface?" ”

Shaking his head, Atlas replied: "This is impossible, the first time the probe landed, the probe analyzed the composition of the soil on the ground. Here, as in other streak areas, only the ferrite content is higher, and its composition is not the cause of the streak movement. Moreover, although the streak area where the probe is now located is a frequent phenomenon, the observation in space does not see the movement of this streak. So, now we have to wait a little longer and see what the difference is when we see the streaks start to move. ”

Then, after the normal picture on the screen continued for a while, the anomaly that Zhou Xin and the others had been expecting to explain the movement of the stripes finally appeared.

At first, the anomaly around the detector was not very obvious, and Zhou Xin and the others didn't even notice it. However, even if the phenomenon was no longer obvious, Atlas still found it.

"Brother Captain, the lighter weight of sand on the ground has moved." As the voice sounded, Atlas focused the probe's footage on the ground. Now, as she says, the smaller grains of sand on the surface are slowly rolling in the same direction.

"What's going on? Why did the grains of sand suddenly start moving? Zhou Xin asked in surprise.

"It's the wind." Before the little girl could answer, Dart heard from the sound coming back from the probe, "The wind is starting to rise around the probe. Under his reminder, Zhou Xin also heard the faint wind that was increasing in the audio.

It didn't take long for the rumors, which were originally just looming, to get louder and stronger, and the intensity was rising. After a few more minutes, the grains of sand that had been just rolling on the ground were blown up, and even some small stones were rolled by the wind.

"Is it the wind?" At this time, Zhou Xin suddenly burst out with a sentence, and then he said suspiciously, "But, is the power of the wind really so great?" How can you make the stripes move in a way that can be seen in space? ”

Over time, the wind around the probe became stronger. A few minutes later, even the pebbles were blown up by the wind, and at the same time, only the yellow sand was left in the detector's field of vision, and the visibility may only be more than fifty meters, and even Zhou Xin and the others heard the sound of sand particles hitting the detector's shell. But even so, the violent winds showed no signs of abating, but became more and more violent.

In just ten minutes, the otherwise calm ground became stormy. According to the data sent back by the probe, the wind force in its position has exceeded 12 at the moment, and it continues to increase. In less than three minutes, the wind was already exceeding the highest wind speed ever recorded on Earth. After only half a minute in this environment, the probe was destroyed by the wind and sand, and lost contact with Voyager.

However, at this time, Zhou Xin and the others no longer cared about the data sent back by the destroyed probe. Not long ago, Atlas had seen the movement of the streaks in the footage sent back by a probe in space. This suggests that the main reason for the movement of the stripes is due to the blowing of strong winds.

"I didn't expect that the reason is so simple, we have been thinking about it for so long." Zhou Xin's emotional tone also had a little crying and laughing.

"People didn't expect it to be like this." Atlas's tone also looked a little helpless, "It stands to reason that the concentration of air near the surface of this planet is not enough to form a strong wind with such a high wind speed, what is going on?" Her words were utterly puzzled. However, it didn't take long for her to seem to have an understanding, "Could it be—" After more than ten seconds of calculation, she said to Zhou Xin, "People probably know what the reason is, but this is just people's speculation, and they still need to let the probe go to the shadow side of this planet to investigate." ”

"Then go ahead."

However, before entering the shadow area of the planet, many probes arrived at the suspected liquid-covered area that Zhou Xin had observed in space before.

"I didn't expect that there really is liquid water on this planet." Zhou Xin said in surprise when they saw a small lake in the lens of the probe, and the analysis results of the probe showed that the main component of the liquid in the lake was liquid water.

Unlike the movement of the stripes, it didn't take long after seeing the lake for Atara to analyze the reason for the lake's existence, "It's an oversight on the part of people who didn't pay attention to the temperature data sent back by the detector." Although the temperature on the sunny side of the planet is very high, the highest place even reaches nearly 300 degrees Celsius. However, the closer you get to the shadow zone, the cooler the temperature on the planet's surface becomes, so that stable conditions can be formed to maintain the presence of liquid water in a narrow area near the shadow zone. "But these lakes only last for a while, and as the planet rotates, the temperature in the area around the lakes rises a little bit." Eventually, the lake water will evaporate completely, eventually becoming part of the planet's atmosphere. As for the streaks on the sunny side, I am afraid that a large part of them are the traces left by the evaporation of the lake water. ”

Listening to the little girl's explanation, Zhou Xin nodded again and again. After explaining why the lake disappeared, she continued: "As for how the lake was formed, it was probably the rainfall that the probe observed in the area where the sun side moved to the shadow side. These newly formed lakes are carried to the shadow zone of the planet with the rotation of the planet, and eventually return to the sunny side from the other side, and then evaporate again. As for what these lakes look like in the shadow zone of the planet, it will take a while for the probe to investigate. ”

As soon as Atlas finished speaking, the first probes to arrive in the shadowed area sent back the latest data. Suddenly, the little girl's face showed a look that was really like this. Then she said excitedly to Zhou Xin: "Sure enough, just as people think, just at the edge of the shadow area, the atmospheric pressure reaches 1.5 times that of the sunny side of the planet. In this situation, it is not surprising that there are no strong winds near the morning and dusk line. ”

"How is that possible?" Hearing Atlas's report, Zhou Xin felt a little incredible, "On the same planet, how can the air pressure be so different. ”

"Mainly because of the large temperature difference between the sunny side and the shaded area." As he spoke, Atlas marked the temperature of each place on the planet on the screen. Needless to say, the sunny side is the one that is in the shadows, and the temperature at the edges has already reached minus 20 degrees. Although the central area has not yet been explored, Zhou Xin only needs to think about it a little to know that the temperature there can only be lower.

After the marking, Atlas went on to explain: "Originally, because of the air convection, the temperature of the two sides of the planet should not be so different. However, due to the extremely slow rotation of the planet, it takes almost seven hundred hours to make one circle. In addition, the atmosphere on the planet is extremely thin, and it is difficult to balance the temperature of yin and yang by relying only on weak atmospheric convection. As a result, cold air will accumulate in large quantities in the shadow zone, and eventually burst out at a certain point, forming a large-scale violent storm like the one just now. After releasing the pressure, the cold air mass will temporarily calm down, gathering strength and waiting for the next eruption. However, there is a critical value for the eruption of cold air masses. However, this threshold is not fixed, but will change from time to time as the actual situation changes. Therefore, although there are periods of intensity and calm in the movement of those stripes on the sunny side of the planet, there is no periodic law. ”

At this point, all the anomalous phenomena that Zhou Xin observed on this planet were reasonably explained. And after the doubts in their hearts were removed, they also had the mood to enjoy the scenery......