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

Black hole missiles, gravitational bombs, matter cracking cannons...

These are symbols of the combat power of advanced civilizations.

The reason is simple, only by mastering the Grand Unified Theory can civilization use the four basic forces as weapons!

……

45 years later.

In the 3700th year of the Earth's calendar, human civilization has officially entered the 38th century.

Since entering the Kepler 452 star system, the sweepers and pastoralism seem to have disappeared.

For at least the past 100 years, human civilization has experienced a relatively peaceful period of development.

Under the joint catalysis of Ling and Lu Yongchang, human civilization has advanced rapidly at an unimaginable speed.

The scope of the star field belonging to the Pan-Human Federation has expanded to five hundred light years.

Thanks to the breakthrough in curvature technology, the highest sailing speed of human civilization has reached an astonishing 100c—the peak of secondary curvature.

Similarly, it is also the pinnacle of level five civilization.

Therefore, the territory of five hundred light years is not considered huge for today's human civilization.

Of course, in the process of territorial expansion, human civilization encountered many civilizations.

Among them, the first to third-level civilizations accounted for the vast majority, and the fourth-level civilizations were only a handful.

As for the fifth-level civilization...

So far, no trace of its existence has been found in human civilization, let alone a higher level six or seven level civilization.

In a sense, this is the normal state.

After all, raising the level of civilization is too difficult.

Under normal circumstances, the development speed of civilization gradually slows down.

But human civilization is different.

Not only did he maintain the original speed of development, but he even showed signs of speeding up!

This is an almost impossible scenario!

In the long history of this universe, countless civilizations have ebbed and flowed, including powerful seventh-level or eighth-level civilizations, as well as basic first-level or second-level civilizations.

However, with the improvement of the level, the development speed of the civilization is constantly accelerating. From the big bang to today, only two civilizations have appeared.

The scarcity of high-level civilization also created a slightly embarrassing scene.

The weapon research and development department of the Academy of Sciences has worked hard to update and iterate weapon equipment, which has hardly been used in the past time.

Most of the civilizations are relatively sensible, especially after the Eugene civilization took action, almost all "willingly" joined the Pan-Human Federation, serving as the fuel to support the rapid development of human civilization.

The only fourth-level civilization that opposed it, after seeing the power of the curvature weapon, also silently joined the Federation.

As for powerful weapons such as black hole missiles and gravitational bombs...

It is still in the warehouse.

Their only chance to see the light turned out to be the test site when the weapon was just successfully developed!

【Earth】, in the chief scientist's office.

Lu Yongchang lay back on the chair with his eyes slightly closed.

Suddenly, he opened his eyes and let out a long breath.

As the technology tree of the fifth-level civilization is becoming more and more perfect, the fog at the top of it is gradually dissipating.

Although he still can't clearly see the symbolic technology of the sixth-level civilization, Lu Yongchang has no impatience in his heart.

As long as he is given enough time, human civilization will become a sixth-level civilization sooner or later!

This is his self-confidence and his wish.

I hope that human civilization can continue to develop peacefully until the end of time.

Unfortunately, his wish was not successful.

With the piercing siren sounding, a blood-red holographic projection appeared in front of him.

【warn! 】

[The interstellar probe encountered an unknown attack. 】

[Attack method: curvature antimatter bomb (preliminary determination). 】

[Attack coordinates: X (408.12 ly) Y (-456.56 ly) Z (507.96 ly)]

The relaxed expression on Lu Yongchang's face disappeared instantly.

"zero!"

"Level [-] alert!"

Chapter 743 Attack!

It is 452 light-years away from the star system Kepler 510.2.

Accompanied by a violent explosion, the investigation team composed of three spherical detectors disappeared into the vast universe.

The embers of the explosion dissipated slowly, and the originally dense and active particles became rarer while cooling down as the temperature dropped and time passed.

What was left was only countless fragments flying towards the surroundings to prove the explosion just now.

……

【Earth】command center.

The atmosphere is dignified.

"How long will it take for the nearest probe to arrive?"

Zhao Zijie's inquiry sounded.

"10 minutes!" A crew member reported loudly.

Hearing this, Zhao Zijie turned around and looked at Lu Yongchang who was beside him: "Professor, do you think the other party..."

"The visitor is not good."

Lv Yongchang said in a heavy tone: "These three detectors are relatively old, almost obsolete products, with a maximum speed of only 30c, and they are not equipped with tachyon radar, so there is no detection method for curvature strikes."

"I just checked the last attack screen sent by the detectors, from which we can basically judge that they were hit by curvature."

"This means that the opponent must be a civilization of level five or above."

"If you don't say anything and do it directly, the other party is definitely not a good character to get along with."

Zhao Zijie nodded silently: "I think so too."

As he spoke, he turned his head to look at the porthole in the distance.

Outside the porthole, the blue planet is still running quietly as before.

Nearby, a large number of warships and drones are slowly leaving giant space ports.

In the extreme distance, a huge spherical planet with a diameter of 6500 kilometers is slowly leaving its original orbit.

The powerful space-time fluctuations formed a huge crest on the highly sensitive tachyon radar.

That is the ultimate weapon of human civilization - planetary fortress [Chi You]!

After the breakthrough of the curvature engine technology, the starship can already ignore the influence of the gravitational field of the star and directly enter the curvature state in the star system.

However, due to the abundance of matter in the star system, accidents such as "collisions" are prone to occur, so most starships will choose to leave the star system and then enter the state of curvature.

At the same time, the precise control of the curvature allows the starship to use the curvature engine to achieve navigation below 1c.

As a result, the navigation method of human civilization starships has undergone qualitative changes.

The antimatter engine is the auxiliary, and the curvature engine is the main one; the antimatter engine is used in the star system, and the curvature engine is used outside the star system.

Except 【Chi You】.

Unlike ordinary starships, [Chi You] is not equipped with an anti-matter engine in the conventional sense due to its large size and mass.

Its power relies entirely on the curvature engine.

Depending on the size of the curvature of space-time, it can achieve a sailing speed of 0-20c.

Of course, within the range of the star system, due to various factors, its maximum sailing speed is only 0.1c.

Although this speed is difficult to compare with conventional starships, it is a planet with a diameter of 6500 kilometers after all!

The diameter of Mars is only 6779km!

It is almost equivalent to a Mars!

"The time for peaceful development ... is over."

Zhao Zijie withdrew his gaze and sighed softly.

Regarding this, Lu Yongchang did not have much emotional fluctuations: "Sooner or later."

"It's beyond my expectation that human civilization has developed to such a territory before encountering a fifth-level civilization."

The moment the voice fell, a burst of intense light appeared outside the porthole.

It even overshadows the light of Kepler 452's host star!

After being filtered by the porthole, the glare became much softer, but it was still a bit dazzling.

That was the grand occasion when the antimatter engine of the expeditionary fleet was activated at full power!

Although it is not clear what happened 510.2 light years away, and it is not clear what purpose the other civilization has...

But human civilization has only one attitude towards this kind of attack without warning.

Stay with me to the end!

"command!"

An eager voice from a crew member sounded: "The first batch of interstellar probes have successfully arrived at the target area!"

"A total of thirty pieces!"

The holographic projection screen in front of it changed instantly, and the image from 510.2 light-years away was presented to everyone with almost no delay.

……

In the empty and cold universe, there is almost no light except for a little bit of starlight in the extreme distance.

The nearest star system is also 5.1 light-years away.

This is a dead place without any life.

Thirty silver-white spherical detectors spread out and probed around.

"drop!"

A crisp reminder sounded.

One of the detectors found a fragment more than a meter long.

Based on the shape and texture of the fragments, it can be easily judged that this is part of the human civilization probe.

The detector easily caught up with the fragment and began to examine it carefully.

"It's part of the shell of the detector." Cao Liangcai's voice sounded in the command center.

Looking at the detection data that flashed quickly on the holographic projection, he frowned slightly: "Looking at these data, it is basically certain that it was an explosion caused by the annihilation of positive and negative matter."

"This attack method doesn't look like a sixth-level civilization."

Lu Yongchang nodded and expressed his agreement: "The detector has not found any unknown signal sources around."

"The attacking enemy should not be in this area."

"Considering the curvature weapons they use, they may even be ten light-years away from us."

Hearing this, Gao Yang, who was sitting next to Zhao Zijie, frowned, and clicked lightly: "This is troublesome..."

"The density of star systems in this star field is very high, and there are seven star systems within ten light-years that have not been explored."

"Not to mention ten light-years away."