Chen Xin was slightly stunned, and wondered: "What good way do you have?"

The steel hammer laughed and waved his hand, as if playing a trick, and a metal ball the size of a football suddenly flew out of its body and appeared in front of Chen Xin out of thin air.

The volume of this metal ball was larger than the body of the steel hammer, but Chen Xin had long been accustomed to the magic of the steel hammer, and his eyes did not blink.

Chen Xin lightly touched the metal ball with his fingers, and the metal ball rolled lightly in the air and quickly stabilized.

Chen Xin was slightly stunned, and said suspiciously: "Steel hammer, what is this?"

Gang Gong said: "Miniature gravitational wave detector! It is encapsulated with a one-dimensional string stretched by the Higgs boson, which is very sensitive, and can detect gravitational fluctuations emitted by objects with a radius of more than 1,000 tons within a radius of 1,000 astronomical units, that is, about 5.8 light days." In addition, there is a miniature fusion battery that can run for 50 years and a miniature curvature engine that can reach as fast as 0.99 times the speed of light. With just 100,000 of these detectors, we can monitor all areas within a radius of 0.1 light-years. ”

A hint of amazement appeared on Chen Xin's face, after living in the Tianqin civilization for so many years, he naturally understood how difficult it was to monitor a star field.

The spacecraft of the third-level civilization has basically reached the near-speed of light, which is not the speed of light in the relativistic sense, but the near-light speed effect that can be achieved by changing the curvature of space to drag the spacecraft forward.

In this case, there is no relative motion between the spacecraft itself and space.

Generally, Level 3 civilizations can bend the curvature of space to 0.99 through gravitational field effects. But going up there it gets very hard.

Only a fourth-level civilization that has broken through the grand unified field theory can make the curvature of space more than 1, at this time. The spaceship will enter a state of faster-than-light flight, which is a technology only available in a fourth-level civilization.

But in this way, it poses a problem for the detection of the spacecraft.

When a ship is close to you at the speed of light, it will not cause Mass Effect as the theory of relativity says.

As a result, the amount of time you can get early warning is very limited.

And faster-than-light flight, not to mention.

Therefore, before the large-scale development of tachyon radar, it was either a third-level civilization or a fourth-level civilization. It is common practice to deploy various detectors as far as possible to provide a long enough warning time for galaxies.

Of course, it is very resource-intensive to deploy probes in such a vast space. In a way, for every 0.1 light-year increase, the resources required increase tenfold.

Even for Level 4 civilizations, their early warning systems will only be deployed to an area about 0.5 light-years away from the planetary system they are guarding.

Unless a high-power tachyon radar is developed. Otherwise, it is difficult to carry out remote early warning.

Chen Xin originally wanted to come over and ask if could make a tachyon radar. Who would have thought that the steel hammer would directly throw such a thing out.

Chen Xindao: "Gangyi, why don't we use tachyon radar?"

Gangyi was a little speechless and said: "Lao Dou, the material you use as a tachyon generator is cabbage, I haven't reached the fifth level civilization yet, I can only make a small amount of tachyon materials, and it is not enough to even supply the Chinese warship, how can I have a superfluous high-power tachyon radar." ”

Chen Xin smiled bitterly: "Okay, but I'm afraid there are a lot of miniature gravitational wave detectors needed." We want to monitor the field around the Flame Galaxy within 0.1 light-years. I'm afraid it won't work without a few million.

The steel hammer quacked and said, "Old bean." This kind of gravitational wave detector is not simple, it can also be assembled according to the array to form an effect similar to gravitational lensing, so that its detection range and detection accuracy can be improved by ten times and hundreds of times. ”

Chen Xin was slightly stunned, frowned and thought about it, gravitational lens?

Chen Xin is certainly no stranger to this concept, the so-called gravitational lensing, which is the convergence or multiple imaging effect produced by the electromagnetic radiation emitted by the source of the guiding force field on the celestial body located behind it.

It is named because of the convergence effect similar to that of a convex lens.

This effect is a phenomenon predicted by Albert Einstein's general theory of relativity in the first century AD, in which light rays are bent in the vicinity of massive objects due to the distortion of space-time in the vicinity of massive objects (rays propagating along short-range lines in curved space). If there is a massive foreground object in the observer's line of sight to the light source, two images will form on either side of the light source, as if a lens was placed between the observer and the object, a phenomenon known as gravitational lensing. Observations of gravitational lensing prove that Albert Einstein's general theory of relativity is indeed a correct description of gravity.

Of course, scientists need a very massive celestial body to observe gravitational lensing phenomena through light, and there is no way to detect the fleets of extraterrestrial civilizations.

Chen Xindao: "Gangyi, can the gravitational wave detection array composed of miniature gravitational detectors you mentioned have the effect of converging gravitational waves? Just like the radio telescopes used by mankind in the past can receive electromagnetic wave signals from the depths of the universe tens of billions of years ago, and its sensitivity and detection distance are beyond the reach of ordinary optical observations.

The steel hammer quacked, nodded and said, "That's right, that's the truth." ”

It pointed at the void, and the flame galaxy in the command center of the Jiangcheng instantly lit up with a 100 trillion holographic projection.

The flame α and flame β orbit more than 10,000 astronomical units at a distance of more than 10,000 astronomical units from the flame γ, while the flame γ independently orbits in a given orbit.

"Lao Dou, the angle between the ecliptic plane of the flame γ and the ecliptic plane of the flame α and β is less than nine degrees, so we can conclude that the four planets in the flame γ are in the same ecliptic plane as these three stars. Generally speaking, in interstellar warfare, if the enemy wants to attack a heavily guarded galaxy, he will start from the outside of the ecliptic plane, otherwise if he enters at an angle perpendicular to the ecliptic, he will be vulnerable to multiple attacks. However, since we have not been in the γ of the flames for a long time, we have not yet established a complete defense system, and we do not rule out the possibility of the enemy attacking from both sides of the ecliptic. Therefore, I divided the defense of the flame galaxy into six directions, and put an average of 10,000 miniature gravitational detectors in each direction, which can carry out uninterrupted detection of objects with a radius of more than one million tons in a radius of 0.4 light years, and if the enemy wants to enter, it should be able to provide us with one to two months of early warning!"

Chen Xin nodded and said with a smile: "Yes, let's do it!" (To be continued......)