3621 years of Earth Calendar.

9.16 light years away from Kepler 452 star system, accompanied by a violent fluctuation in time and space, a huge fleet suddenly appeared in this dark and cold universe.

The secondary curvature technology with 30 times the speed of light shortens the entire journey to less than four months.

The gamma rays emitted by the antimatter engine actively detect the various rays released by the radar, making this star field lively again - just like three months ago.

The fleet hovered quietly in the empty universe and sent a quick message to the direction of Kepler 452 star system.

...

"drop!"

A crisp reminder sounded in Lu Yongchang's office.

In the azure holographic projection, a message flashing with a yellow light appeared.

But Lu Yongchang behind the desk did not move at all.

He was still leaning quietly on the office chair, his eyes closed, as if he was asleep.

After a brief wait, the wake-up program starts to work, and zero unique electronic synthesizers ring out of the speakers.

"Professor, professor!"

...

Inside the tech tree space.

Lu Yongchang "sitted" in front of the white technology tree in the air, looking at the mottled background in the distance with a dull look.

In front of him is a cursor with a brightness of more than 50%.

【Fast Radar】

After mastering the curvature technology, a new problem emerged.

After entering curvature navigation, the starship's ability to observe externally is greatly attenuated.

The reason is very simple.

The existing observation methods are all developed based on the light speed universe.

Therefore, when the movement speed exceeds the speed of light, previous external observation methods have failed widely.

For example, when a person is in a state of super-light speed, the naked eye can only see the starlight in front of him "surrendering" at an acceleration, and the starlight behind him will never catch up with you.

The same goes for Starship.

Calculate and process the information coming from the front of the starship, which can restore the scene of the starship's advance direction well.

There is no good solution for information processing at the rear or side...there are currently humans.

Therefore, today's planetary warships have a huge flaw after entering superluminal speed navigation - once they encounter attacks from behind or on the side, the warships will be like blind people and have no way to avoid or counterattack.

In other words, in order to deal with possible future wars, the current human fleet urgently needs a radar that can be used in curvature navigation states.

Since this did not affect the normal navigation of the starship, the Academy of Sciences lowered the priority of this research at the beginning.

It was not until the rest of the basic research that the Academy of Sciences put the research on the agenda again.

The fast sub radar in the technology tree system can just meet this need.

Fast cells will undergo slight changes under the action of gravitational field and external energy.

Fast sub radar is made based on this feature.

However, due to the nature of fast cells, it has a huge difference from previous active detection radars - it is a passive detection radar.

But this will not affect the detection accuracy and detection efficiency of fast sub radar.

Whether it is the planetary gravitational field, the gravitational shield of planetary warships, curvature bubbles... these will trigger the reaction of the fasten radar.

Coupled with the superluminal speed characteristics of fast subs, within the accuracy allowable range, fast substation radar can even achieve passive detection of peripheral areas without delay!

There are advantages and disadvantages.

In the case of the great advantage of super-light detection, it also has a huge disadvantage - in the case of insufficient accuracy, when the detected object is too backward or too small, it will not be too small.

A big reaction.

For example, a small meteorite.

Its gravitational field is too small and it is difficult to cause changes in the frequency of fasteners.

For example, a level 4 civilization and starship below that has not yet mastered gravity technology.

The quality is relatively small, and the gravitational shield technology and curvature bubble technology are not mastered strong enough, and it cannot induce the reaction of fast radar. Even if the detection accuracy is greatly improved, it can easily regard these starships as one of the universe.

an asteroid.

This is also the reason why the Sweeper civilization was forced to use carpet-style search for the human civilization fleet at that time.

But is there any problem with this?

No problem.

For today's human civilization, or for higher-level civilizations, how big is the difference between starships of level 4 or below and asteroids?

"professor……"

"professor!"

The vague call of call interrupted Lu Yongchang's thoughts.

After a little identification, he realized that it was the sound made by Zero.

He stopped thinking and glanced at the white technology tree and the mottled background again. With a moving consciousness, he directly exited the space of the technology tree.

...

"Professor, professor..."

As consciousness returns, the call in my ears becomes clear quickly.

Listening to the unchanging, unchanging stiff electronic synthesizer, Lu Yongchang felt a soreness in his teeth.

He suddenly opened his eyes: "Okay, stop howling!"

"teach……"

The electronic synthesizing sound came to an abrupt end.

"What happened?" Looking at the message flashing with an orange-yellow warning light in front of him, Lu Yongchang subconsciously frowned and asked.

"The Expeditionary Fleet sent a message from Kuaizi. The fleet has arrived at the coordinate area and has not yet discovered the target fleet..."

Lu Yongchang reached out and clicked on the message, glanced at the contents quickly, and said in a deep voice: "It has only been less than 4 months, and they can't run far."

"Tell the Expeditionary Fleet and ask them to send probes to conduct a carpet search!"

"In addition, if a war breaks out, let Zhao Zijie do a good job in command."
Chapter completed!