Lu Yongchang's words obviously shocked Cao Liangcai on the side.

"Professor Lu?"

"Are you sure you want three astronauts to take such a big risk?"

"How about... let's let them come back and let's discuss it in the long term?"

Lu Yongchang looked at the data on the report sheet with a gloomy expression.

The danger is definitely there.

After all, no one knows what the black circle is.

What if it was some kind of high-intensity radioactive material... Even with the protection of spacesuits, these three astronauts would have to end up on the moon.

However, the current situation facing Xia Kingdom does not allow them to make long-term plans!

Lu Yongchang gritted his teeth, a flash of determination flashed in his eyes, and then he gently pressed the radio communication button.

"This is the ground command center, please answer when you receive it!"

…

Bai Yixuan stared at the black concentric circles in the crater, a chill rising involuntarily behind his back.

"Do you think this is a trace left by an alien civilization?"

silence.

There was no response in the team voice.

After a long time, Hong Fan's unique hoarse voice sounded on the radio channel: "It should be so."

"Maybe we are being monitored by this alien civilization now..."

Xia Wanyi on the side shuddered suddenly and subconsciously raised her head to look at the sky.

It was pitch black.

She couldn't see anything strange except for a few stars.

"laugh……"

Just when Bai Yixuan was about to say something, a burst of electricity came from the radio.

"This is the ground command center. Please answer when you receive it!"

Bai Yixuan's expression suddenly became serious: "Bai Yixuan received it, please tell me!"

After a delay of a few seconds, Lu Yongchang's slightly tangled voice came over the radio: "Captain Bai, after technical analysis, we have basically confirmed that the black concentric circle pattern in front of you is a man-made object."

Bai Yixuan's pupils dilated slightly and his breathing became faster: "Then...Professor Lu, do we need to do anything?"

The massive secretion of adrenaline made his voice sound a little hoarse.

Lu Yongchang's sigh came over the radio.

"Captain Bai, we need to analyze the truth of this black circle, so I hope you can go to the black circle and check it out."

"Of course, this is not a requirement."

"After all, we don't know if it's dangerous."

"Once danger arises, maybe..."

Speaking of this, Lu Yongchang's voice suddenly stopped: "So, everything follows the principle of voluntariness."

Bai Yixuan's breathing became more and more rapid.

He understood the meaning of Lu Yongchang's words.

After all, they are on the moon, 400,000 kilometers away from the earth.

Once something unexpected happens, their outcome is basically doomed.

"Professor Lu..." Bai Yixuan's Adam's apple trembled slightly, "I am willing to check."

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

"If anything happens, I guarantee you in the name of the space agency that your relatives will receive the most favorable treatment!"

Bai Yixuan took a deep breath, turned to look at the two teammates around him, and smiled pretending to be relaxed.

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

"If something happens, just pull me back."

Bai Yixuan's words reached the ears of two teammates through the radio.

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

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

Faced with the dissuasion of two teammates, Bai Yixuan chuckled and shook his head: "This is already considered a second type of contact, and the level of danger is very high."

"As the captain, this is my responsibility. You two, just stay by your side."

Seemingly sensing that the atmosphere was too solemn, Bai Yixuan smiled and patted Hong Fan on the shoulder: "What? You don't want to steal my military glory, do you?"

"I'm telling you kid, no way!"

After saying that, Bai Yixuan tied the safety rope of the lunar rover around his waist, turned around and walked down to the crater!

…

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

Bai Yixuan jumped to the bottom of the crater in three steps and then walked carefully 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, you can move on."

Bai Yixuan walked very slowly, and it took him half an hour to cover a few hundred meters.

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

"What's wrong?" Lu Yongchang, who was 400,000 kilometers away, immediately asked.

"Is this... 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 but tighten the safety rope in his hand.

He is ready.

Once anything 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 gently rubbed his fingers.

Even with the thick space suit blocking him, he noticed that the ground near the black circle was obviously much smoother than the area next to it.

"Professor Lu, it's a bit like moon dust that has solidified after being melted by high temperature."

"...Received." Lu Yongchang's solemn 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 Xia Kingdom.

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

"Professor Lu, the Congressman is here!"

Cao Liangcai's reminder came from the side.

Lu Yongchang quickly stood up and looked towards the door.

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

"I heard that traces of extraterrestrial civilization were discovered?"

Facing the Speaker's question, Lu Yongchang nodded slightly, with a hint of bitterness in his eyes: "President, I'm afraid so."

As he spoke, he turned sideways and showed the screen on the computer to Congressman Li.

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

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

Congressman Li's expression became more solemn.

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

Lu Yongchang slowly shook his head.
Chapter completed!