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

……

Two years later.

Ross 2 star.

Viewed from a high altitude, the whole body is earthy yellow, and a thin "ribbon" winds across the vast land.

It was the broad freshwater river named the Ross River.

The detection data shows that the total length of the Ross River is 4103 kilometers.

The starting point is the snow-capped mountains near the equator.

Under the continuous accumulation of snowmelt, this wide and long river that stretches for more than [-] kilometers has gradually formed!

The average width of the Ross River is 82 kilometers, and the widest point reaches 230 kilometers.

The average depth is 11.4 meters, and the deepest reaches 37 meters!

Although it is the only fresh water source on the surface of Ross 2, its huge water storage capacity can fully meet the needs of human civilization.

After all, compared with before, after becoming an interstellar civilization, human beings' recycling rate of water resources has greatly increased.

Beside this thousands of kilometers of ribbon, a "drop" of silver-white pearls suddenly appeared.

That was the first city built by humans—Center City!

In just two years.

A huge hemispherical building rises beside this wide river!

The overall skeleton made of carbyne, plus the skin made of carbon nanotube material...

It is no exaggeration to say that this central city can even withstand the impact of some small meteorites!

Next to the central city, on the other side of the Ross River, the construction of the second city also started not long ago.

If you zoom in, you can even see a huge army of robots and robotic arms on the ground!

Under Zero's command, these robots and mechanical arms worked tirelessly day and night.

And the construction progress of No. 2 city is also advancing at a speed visible to the naked eye!

……

Above Ross 2.

【Earth】port.

A neat line of scientific researchers in spacesuits walked towards Xuannv No. [-] in front of them.

Through the glass mask, you can clearly see the anticipation and excitement in everyone's eyes!

The most perfect living place for human beings since leaving the earth is close at hand!

"Finally able to live a stable life!"

Tao Yuda, who was in the queue, had joy written all over his face.

Because he was wearing a helmet, He Bilin beside him did not hear him talking to himself.

From He Bilin's perspective, Tao Yuda was muttering something with an "idiot" look on his face.

Although Tao Yuda belonged to his elders, he reached out and tapped the helmet in front of him mercilessly.

"laugh……"

A burst of electricity sounded in the helmet.

The two connected to a private communication channel.

"What's wrong?" Tao Yuda looked blank.

So... He Bilin expressed the scene he saw just now with an extremely disgusted expression.

"Isn't it just landing on a planet?"

"Academician Tao, do you need to be so excited?"

Tao Yuda laughed, and then looked at He Bilin in front of him with complicated eyes.

"Hey……"

He sighed softly.

"After so many years, you can finally step on the yellow earth again and see the blue sky and white clouds... You won't understand this feeling."

He Bilin curled his lips: "What's the matter...in the holographic theater, can't you see it anytime?"

Tao Yuda's eyes became more and more complicated.

He shook his head again and again: "It's not the same."

"It's a pity that the environment of Ross 2 is not suitable for human survival. Otherwise, I will take you out for a walk and you will understand."

"Imagine, on the lush grass, the lush forest in the distance, the wind is sunny, the blue sky and white clouds, the feeling of the breeze blowing on the face..."

"That's the breath of freedom!"

He Bilin was silent for a while, then spoke again.

"The starship fresh air system, high-power daylight, and holographic theater can be displayed perfectly."

Tao Yuda sighed deeply.

He didn't explain anymore, but just reached out and patted his shoulder: "I hope, one day, I can make you feel truly free."

After speaking, he turned around and followed the pace of the team.

Looking at Tao Yuda's back, He Bilin's eyes became more and more suspicious.

Chapter 326 1420 MHz

He Bilin silently followed Tao Yuda's footsteps.

Is the gap really that big?

He Bilin recalled his last experience in the holographic cinema.

I vaguely remember that before entering the holographic theater, the so-called degree of fidelity was marked on it.

Among all the simulation scenarios, the simulation of the earth environment has the highest degree of fidelity.

95%.

This is why He Bilin chose to experience it.

only……

Looking back now, although the scenery I saw at that time was extremely stunning, there was always an indescribable feeling.

Perhaps, this is the breath of freedom that Academician Tao said?

Only a 5% difference can reflect such a complicated difference?

He Bilin suppressed the doubts in his heart, turned his head and looked into the distance.

【Earth】The main port is open, and Xuannv-[-] ships are slowly sailing to the endless deep space outside the port.

Facing the direction of the port, it is a khaki-yellow planet.

That is their destination - Star Ross 2, the new home of mankind.

……

Ross 2 star.

Central City.

Lu Yongchang was sitting in the office, looking at the external projection screen with relief.

In the blue sky, long rainbows streaked across.

Each rainbow represents a Xuannv No. [-].

After 242 years of turbulence, travel, and war, human civilization has finally achieved a stable and stable development environment...

"Drip-drip-drip!!!!"

A shrill siren sounded in his office.

In just a split second, the originally bright office was covered in a burst of blood-like bright red!

The next moment, a holographic projection projected in front of Lu Yongchang!

【warn! 】

[Unknown signal detected! 】

[Signal source: Ross 154]

[Signal frequency: 1420 MHz]

【…】

In the blood-red holographic projection, the black handwriting is particularly shocking.

Lu Yongchang's originally soothing mood dissipated instantly.

He stood up abruptly from his chair, his eyes full of horror!

1420 MHz communication frequency!

It has always been the signal band for humans to search for information on alien civilizations!

the reason is simple.

1420 MHz is the frequency of a famous spectral line emitted by neutral hydrogen atoms - the 21 cm spectral line.

As the most common and abundant element in the universe, every advanced civilization that has developed to a certain level will be very familiar with this property.

1420 MHz, on the other hand, falls into the area where radio signals are relatively quiet.

In this signal frequency band, the intensity of all kinds of background radiation is almost the smallest.

Therefore, if you want your own signal not to be drowned by the noise radiated by celestial bodies, and to be received by advanced civilizations that have developed to a certain level, 1420 MHz is an excellent signal frequency choice.

And now!

In the direction of Ross 154, a signal of this frequency came unexpectedly!

What this means, presumably needless to say.

Reminiscent of the abnormally bright phenomenon more than 60 years ago...

At this moment, Lv Yongchang only felt trembling all over, and a chill shot down his back!

"zero!"

Without any hesitation, Lu Yongchang directly issued an order: "Stop all work!"

"Notify Zhao Zijie that the human fleet is in first-level combat readiness!"

"All troops, immediately enter a state of radio silence!"

……

【Earth】

port.

With a harsh siren sounding on the public communication channel, the open port in the distance slowly closed.

At the same time, the faint blue flames at the tails of several Xuannv II ships that were preparing to take off quickly extinguished.

A red warning light began to flash.

"What, what's going on?"

He Bilin, who was born after the Battle of Proxima Star, froze in place for a moment.

Because of the lack of necessary experience, his brain came to the answer after a moment of stagnation.

It seems... the fleet is in danger?

"He Bilin!"

As the familiar voice sounded in the team's communication channel, a huge force struck from around him.