Age of Cataclysm: I can light up the technology tree

After watching the two people get on the lunar rover and leave, Bai Yixuan turned around and fixed his body with a hook lock.

Then, he raised the special shovel in his hand and smashed it against the moon rock beside him.

Because the moon's gravity is only one-sixth that of the earth, Bai Yixuan's movements seemed a little light.

But the moment the shovel collided with the moon rock, a powerful counter-shock force came along the shovel.

The counter-shock force that seems insignificant on the earth is like a nightmare on the moon.

Before Bai Yixuan could react, his body was thrown away.

The hook lock used to fix Bai Yixuan's body suddenly collapsed, and his body was pulled back to the original position.

Bai Yixuan subconsciously raised his hand to wipe the cold sweat on his forehead, but he touched the slightly cold mask.

So dangerous...

It seems that I still tried too hard.

He carefully adjusted how hard he swung the shovel.

After more than ten minutes, he slowly breathed a sigh of relief and put a few pieces of broken moon rock into the storage box next to him.

Just when he was about to ask Hong Fan and the others about their situation through the radio, a piercing scream came from the helmet!

"This is!!"

Bai Yixuan's heart suddenly tightened.

Without time to think, he directly turned on the radio call function in the space suit: "Wanyi! What happened?"

After a brief silence, Xia Wanyi's frightened voice came from the helmet.

"We...we found something strange!"

Hearing Xia Wanyi and Hong Fan's descriptions, Bai Yixuan's pupils shrank slightly, and he immediately said: "You two, don't move, I'll be right over!"

After interrupting the communication within the team, Bai Yixuan gently bit his back teeth and quickly connected to the earth's communication channel.

"Call the ground command center!"

"An abnormality was found! Repeat, an abnormality was found!"

…

Twenty minutes later.

Bai Yixuan panted and found Xia Wanyi and Hong Fan standing next to the crater.

Seeing that the two of them were intact, Bai Yixuan breathed a sigh of relief.

fine……

"Ground Command Center, I found them!"

Bai Yixuan said with relief: "They are fine, they are just standing next to a crater."

A few seconds later, Lu Yongchang's solemn voice came from his earphones.

"Received, what's the specific situation?"

"Wait a minute, I'm connecting the camera." As he said this, he turned on the camera mounted above his head.

"drop!"

A clear beep sounded inside his helmet.

Seeing that the camera on the panel began to transmit signals normally, Bai Yixuan "jumped" to his teammates: "What's going on?"

Hong Fan didn't speak, but pointed inside the crater.

The crater is very small, not even 1 kilometer in diameter.

On the moon, it is a relatively small crater.

In addition, the crater is relatively shallow, so sunlight can shine on its bottom without any obstruction.

The moment he saw the scene inside the crater, Bai Yixuan's pupils shrank violently!

On the silver-white moon surface, a black concentric circle suddenly appeared.

There are nine layers of concentric circles, and Bai Yixuan estimates that the outermost circle is at least twenty meters in diameter!

…

Earth, ground command center.

The moment black concentric circles appeared on the screen, the entire command center fell into silence!

More than ten seconds later, Cao Liangcai on the side said with a trembling voice: "This... what is this..."

Compared with Cao Liangcai, Lu Yongchang's reaction was much duller.

After all, he had already been mentally prepared.

He took a deep breath and said softly: "Let the technical department analyze the image."

"I want to know the diameters of these concentric circles and whether their center positions are standard!"

This approach is also to exclude the fact that concentric circles are naturally formed.

After all, the universe is full of wonders. What if it is really the pattern that the meteorite smashed out when it fell?

Although the probability is very slim, those who do science must be more rigorous.

The analysis results came out quickly.

"Professor Lu, the center positions of the nine concentric circles are very standard. Not only that, their curvatures are very standard!"

A researcher held a report sheet in his hand and hurriedly ran to Lu Yongchang and whispered.

Lu Yongchang's expression changed slightly, and he quickly reached out to take the report.

Looking at the data on the report, Lu Yongchang's face turned ugly for a moment.

"Old Cao, come and see, these nine concentric circles are as if they were drawn with a compass!"

Cao Liangcai on the side leaned over.

The moment he saw the data on the report sheet, Cao Liangcai's expression changed slightly: "It seems that this concentric circle is not a naturally formed pattern."

"Could it be that it was left behind by the last time the United States landed on the moon?"

Cao Liangcai's eyes moved slightly and he said softly: "Don't forget, this area is also the moon landing site of the American Apollo 11."

Lu Yongchang pondered for a moment, then slowly shook his head and said: "No, it will definitely not be the traces left by Apollo 11."

"You see, based on the diameter of this crater and the scale of the picture, the largest concentric circle has a diameter of 20 meters."

"The Apollo 11 command module was conical, with a bottom diameter of 3.9 meters, and the service module was a cylinder with a diameter of 3.9 meters. The size difference between the two is really too big."

Speaking of this, Lv Yongchang paused slightly: "I wonder if you feel that this black concentric circle is a bit like the jet of the Hall thruster?"

Cao Liangcai's pupils shrank suddenly!

That's not to say he hasn't noticed it yet!

The Hall thruster nozzle of Xuannv No. 1 is also composed of several concentric circles with regular shapes!

Hall thruster

He swallowed slightly and said softly: "Could it be that...there are other countries on Earth besides us that have mastered mature Hall thruster technology?"

Lv Yongchang shook his head solemnly.

"No!"

"Before mastering small fusion reactor technology, Hall thruster technology is basically equivalent to chicken ribs."

"What's more...there shouldn't be such a large spacecraft on Earth."

"A Hall thruster nozzle with a diameter of 20 meters...In my opinion, this is definitely an engine that only spacecraft that crosses the star system can have!"

A drop of sweat slowly slid down Cao Liangcai's forehead.

The current situation is completely beyond his control.

He looked at Lv Yongchang with a nervous look: "Professor Lv, we are now..."

Lv Yongchang's expression was stern, and he turned his head to the researcher beside him and said: "Report this matter to the chairman of the parliament, remember, be quick! Also, keep it confidential!"

Seeing the researcher leave, Lv Yongchang's eyes gradually became tangled.

"Perhaps, we can only know the truth of the matter if we get close to that black circle!"