It's reasonable for me to have a two-way foil for a second-level civilization, right?

He understood the meaning of Lu Yongchang's words.

After all, they are on the moon, 40 kilometers away from the earth.

Once something unexpected happens, their ending is basically doomed.

"Professor Lu..." Bai Yixuan's Adam's apple twitched slightly, "I'm willing to check it out."

"Okay." Lu Yongchang's voice was full of complexity, "Xia Guo, I will remember you!"

"If anything happens, I assure you in the name of NASA, your relatives will receive the best treatment!"

Bai Yixuan took a deep breath, turned his head to look at the two teammates around him, and pretended to smile relaxedly.

"You two, stay here and help me pull the safety rope."

"If something happens, just pull me back."

Bai Yixuan's words were transmitted to the ears of the two teammates through the radio.

Xia Wanyi's eyes instantly turned red: "Captain, how about... why don't you go?"

Hong Fan hesitated for a moment, and then said, "Captain, I'll go with you. If anything happens, I can help you."

Facing the dissuasion of his two teammates, Bai Yixuan shook his head with a light smile: "This is already considered the second type of contact, and the degree of danger is very high."

"As the captain, this is my duty, you two, just stay by your side."

As if sensing that the atmosphere was too dignified, Bai Yixuan patted Hong Fan's shoulder with a smile: "What? You don't want to steal my military achievements, do you?"

"I tell you kid, no way!"

After speaking, Bai Yixuan tied the safety rope on the lunar rover around his waist, turned around and walked towards the crater!

……

The crater is small, and the slope of the crater wall is not very great.

Bai Yixuan jumped to the bottom of the crater in two steps in three steps, and walked cautiously towards the black circle in the center of the crater.

"Professor Lu, can you see it?"

Just in case, Bai Yixuan stopped and asked softly.

A few seconds later, Lu Yongchang's voice came: "I can see that the camera is working normally, and you can move on."

Bai Yixuan walked very slowly, it took a full half an hour for the distance of several hundred meters.

Looking at the outermost black circle less than one meter away from him, Bai Yixuan was slightly taken aback: "It's unbelievable..."

"What's wrong?" Lv Yongchang, who was 40 kilometers away, immediately asked.

"This is... a glass-like substance?" Bai Yixuan slowly lowered his body, and reached out to touch the black circle.

Hong Fan, who saw this scene from a distance, couldn't help tightening the safety rope in his hand.

He is ready.

Once something unusual happens, he will directly drag Bai Yixuan back!

All the researchers on Earth were also sweating.

Bai Yixuan's right hand gradually touched the black substance on the ground.

Nothing happened.

He rubbed his fingers lightly.

Even with the thick spacesuit blocking him, he noticed that the ground near the black circle was significantly smoother than the area next to it.

"Professor Lu, it's a bit like moon dust that was melted by high temperature and solidified."

"... Received." Lu Yongchang's dignified voice sounded, "Captain Bai, please help me dig out some samples."

"Also, I need detailed modeling data for this crater!"

……

two hours later.

The detailed modeling data and sample photos of the crater were sent back to Xiaguo.

Looking at the clear photos on the computer in front of him, Lu Yongchang sighed deeply.

"Professor Lu, the chairperson is here!"

Cao Liangcai's reminder came from the side.

Lu Yongchang hurriedly stood up and looked towards the gate.

Mr. Li walked quickly and walked towards him with a solemn expression: "Yongchang, what's going on?"

"I heard that traces of extraterrestrial civilizations have been discovered?"

Faced with the chairman's question, Lu Yongchang nodded lightly, with a bit of bitterness in his eyes: "Mister, I'm afraid it is."

While speaking, he turned sideways and showed Mr. Li the screen on the computer.

"According to my speculation, this concentric circle pattern is most likely the trace left by the high temperature when the Hall thruster was started."

"Considering the size of the engine nozzle, there is only one possibility of extraterrestrial civilization."

Councilor Li's expression became more serious.

"Besides this trace, have you found traces of other extraterrestrial civilizations?"

Lu Yongchang shook his head slowly.

"Then... does the change of the sun have anything to do with this extraterrestrial civilization?"

Chapter 90 Voyager

Mr. Lee's question attracted everyone's attention.

Every researcher present looked at Lu Yongchang anxiously.

Lu Yongchang pondered for a moment, then slowly shook his head.

"The change of the sun is most likely not caused by this civilization."

Before Mr. Li breathed a sigh of relief, Lu Yongchang continued to say in a deep voice: "I suspect that the sun was tampered with by another advanced civilization."

The chairman of the council shrank his pupils suddenly, and exclaimed subconsciously: "What?! There's another one?!"

After a moment of astonishment, Councilor Li regained his usual calmness, but in the depths of his eyes, he could still see a little anxiety and uneasiness.

"Yongchang, can you tell me what your judgment is based on?"

Hearing Mr. Li's question, Lu Yongchang raised his head slowly, and explained solemnly: "It's very simple."

"The power source of the Hall thruster is actually not very advanced."

"In other words, among cosmic civilizations, the Hall thruster should be the lowest-level propulsion method."

"The basis for my judgment..."

"At least we have initially mastered the Hall thruster."

The faces of the people present changed slightly.

It's hard to say, but it does make sense.

Even if humans living in their home planets can master the Hall propulsion technology, then, what advanced technology should those extraterrestrial civilizations with the ability to navigate the star system possess? !

Seeing the uncertain expression of the chairman of the congress, Lu Yongchang chuckled: "You don't have to be so pessimistic."

"There is still good news."

"At least, the technological level of the extraterrestrial civilization found on the moon is almost the same as ours."

Councilor Li was stunned, with a bitter smile in his eyes: "That's the only way I can think."

"It's just...if the sun is being targeted by another advanced civilization, wouldn't we..."

The expression on Lu Yongchang's face became more and more relaxed.

"Chairman, there is no need to worry so much."

"Although it is a bit harsh to say this, in the eyes of advanced civilizations, we are nothing but bugs."

"Will you pay attention to the movement of a nest of ants in front of your house?"

The chairman of the council looked at Lu Yongchang in front of him in astonishment, and couldn't accept his statement for a while: "You mean, we humans... are just a nest of ants?"

"...Maybe even worse than ants."

Councilor Li smiled wryly and shook his head: "If that's the case, then I don't have to worry about it."

……

After seeing off Mr. Li, Lu Yongchang returned to the office alone.

The moment he closed the door, he let out a long sigh.

Will advanced civilizations really not notice human movements?

The answer is naturally no.

Human beings must be noticed by a certain advanced civilization.

Otherwise, Lu Yongchang didn't know how to explain the change in the time of the solar anomaly.

Just like a nest of ants living quietly at the door of the house will not attract attention, but once the nest of ants starts to expand their territory and declare their strength, it will inevitably attract a lot of attention.

Even, lead to disaster.

But what is the reason that caused human beings to be missed by more than one civilization?

Lu Yongchang fell into deep thought.

Suddenly, there was a slight movement in his heart, and a piece of history appeared in his mind.

1977年8月20日和9月5日，旅行者一号和旅行者二号从米国发射升空。

Two probes are tasked with outlying planets.

As early as 2012, studies have shown that Voyager has sailed into interstellar space, that is, outside the solar system.

The plutonium batteries inside Voyager continued to operate until five years ago, in 2025.

After the battery was exhausted, humans never received information from Voyager. In other words, since five years ago, whether Voyager still exists in interstellar space has become an unknown.

Inside the Voyager, two gold-plated records and a diamond phonograph needle were carried.

The record contains a lot of human information, and even has greetings in 55 human languages ​​and some world classic music.

In addition to this information, the record also contains photos of the planets in the solar system, as well as the specific coordinates of humans and the earth!

Once the two Voyagers are intercepted, all the information of human civilization is basically exposed to other civilizations!

Thinking of this, Lu Yongchang's face turned ugly for a moment.

According to time speculation, the accident of the Voyager probe has become a certain event!

The catastrophe facing the earth and mankind is the result of what the United States did in 1977.

……

months ago.

The moment when the brilliance of nuclear fusion just shone on the land of Xia Kingdom.

In an artificial planetary fortress that is light-years away from the solar system.

One of the tasks of Sweeper 9527 is to sift through the data from the various probes in the galaxy.

Countless detectors are sending all kinds of data to the main civilization all the time, most of which are useless information.

For example, supernova explosions, black hole annihilation, or celestial body collisions are all irrelevant information.

He needs to find useful information from countless complicated data.

As for what is useful information...

"Sir, we found a planet with exposed coordinates at the edge of the Orion arm of the Milky Way."

Hearing the information reported by his subordinates, Sweeper 9527's visual organs shook slightly.

"Oh? Orion's arm? Such a barren place can give birth to civilization?"