This emergency message was sent by Sergei, the military commander responsible for the specific navigation mission of the Expeditionary Fleet. In the entire Expeditionary Fleet, only a few senior commanders have the authority to directly communicate with Yuan Shichen.

"I received a super-light electromagnetic wave signal with significant regularity!!" Yuan Shichen was also shocked when he saw the message.

"Don Gilleshode, follow me to the command center right away!"

"yes!"

Although Tang Jikede didn't understand why, he still followed Yuan Shichen out of the super laboratory without hesitation.

The scientists present were immersed in the joy of making breakthroughs in heavy element decay technology at the last moment, and were thrown by the commander at the scene, all of whom were stunned.

In the Expeditionary Fleet Command Center, military commander Sergei, engineering department commander Tesla, science deputy commander Luola, Wang Yao and others had already gathered and were waiting for Yuan Shichen's arrival.

"leader!"

"Hello!"

When Yuan Shichen stepped into the command center, everyone greeted him.

After Yuan Shichen nodded and asked immediately, "What's the specific situation? Play the received signal!"

"The signal duration is about 21.8 seconds, and it propagates at the super-light speed. The specific propagation speed is 18 times the speed of light in three-dimensional space, which is slightly slower than our communication speed."

"￥%￥%￥%!#!#!#"

While Sergei introduced, communications officials have simulated the captured signal.

"It is indeed different from the cosmic noise I received in the past, and there is obvious regularity!"

After seeing the data of this signal, Yuan Shichen immediately made a judgment, and he agreed with the conclusion of the communications department.

"The frequency and band of this signal are significantly different from us, and due to insufficient signal duration and information, we cannot crack the meaning of it." Sergei continued.

"Can we roughly determine the direction of the signal source?" asked Yuan Shichen.

The Expeditionary Force successfully developed and applied super-light speed communication technology in four-dimensional space 20 years ago. In order to meet the demand for super-light speed propagation, the signal emitted must first be large enough, and the requirements for directional propagation of electromagnetic waves will be very high. Otherwise, the attenuation loss of electromagnetic waves in space will be more significant, ultimately limiting the distance of signal propagation.

It is precisely because of the precise requirement of directional propagation of signals that it is easier to judge the general direction of the signal source.

"The signal source is transmitted in the range of +-18.5° directly in front of the fleet route." Sergei replied loudly.

"What is the prediction of the distance between you and the fleet?" Yuan Shichen continued to ask, this was a difficult problem.

"This is impossible to judge!"

Sure enough, Sergei could not answer this question. He was so honest that he quickly turned his head to wink at the communications officer beside him, but the communications officer just shrugged helplessly.

"Tesla! You should have some idea." Yuan Shichen turned around and asked meaningfully at Tesla, the commander of the engineering department standing in the corner.

"Ah! Leader, please wait, let me think about it." Tesla didn't expect that he would be called and asked at the corner, and was stunned at the time.

"Okay, I'll give you 30 seconds. I want to hear your analysis from a technical perspective." said Yuan Shichen.

"Yes! Leader." Tesla's eyes lit up and he quickly replied, "Oh, there is, there is."

"Since the signal also propagates at the super-light speed, we can refer to our technical parameters to analyze the signal's strength and attenuation status, so as to roughly determine the distance the signal flies." Tesla frequently nodded, and his eyes turned rapidly. "We can accelerate the electromagnetic wave to 20 times the speed of light, and the other party's propagation speed is 18 times the speed of light, so I think their equipment power will be correspondingly lower. If we convert year-on-year, this and that, let me see the parameters of this electromagnetic wave."

"What's your final prediction?"

Yuan Shichen asked, and everyone else was staring at Tesla, waiting for his answer.

"Don't worry, there's, there's." Tesla wiped a sweat stain on his forehead. "This is a rough value, about 80 to 120 light-years away from the fleet."

"Okay! Beautiful job." Yuan Shichen patted Tesla on the shoulder and praised with a smile.

"So, next, let's discuss who or what object emitted this signal 100 light years away. What does this signal mean?" Yuan Shichen looked around and continued to raise several important questions.

Since the invention of radio by Italian scientist Marconi in 1895, humans have been broadcasting into vast space, and even launched the Beatles' song "Traveling the Sky" to the North Star, hoping that one day, the alien civilization located somewhere in the universe will hear and respond to us.

Although the earliest radio waves emitted by humans on Earth have spread in all directions in the universe for more than 300 light years, compared with the radius of more than 50,000 light-years in the Milky Way, the range of these radio waves is so limited.

The most critical point is that with the technological strength of mankind at that time, the power of the radio waves emitted was really pitiful and could not spread too far, so it decayed early.

Therefore, human civilization has always been able to listen to various noises from the universe and lament its own insignificance, sadness and loneliness.

"Leader, although everyone thinks that this signal is likely to come from an unknown cosmic civilization. But is it possible that the source of this signal is a special pulsar." Science commander Don Gilleskod was the first to express his insight, "Just like we have monitored and discovered many fast radio bursts (the duration is usually only a few milliseconds, and the burst energy is equivalent to the energy released by the sun within a month. Each burst explosion covers a certain range of radio frequency frequencies, just like the entire frequency modulation band is playing music), perhaps a new pulsar or other celestial bodies will also emit electromagnetic wave signals with certain regularity."

"Even if a natural celestial body may emit a regular electromagnetic signal, does it really have the ability to emit ultra-light signals?" Rolla, deputy commander of science who successfully developed ultra-light communication technology, asked questions about Don Gilleskod's views.

"We had no chance to observe celestial bodies such as pulsars in four-dimensional space before, and naturally could not monitor the super-light signal she emitted. At least we have no direct evidence to judge that natural celestial bodies cannot emit super-light signal." Tang Jikede continued.

"Your view is indeed possible. If so, then the distance between this signal source and the fleet cannot be calculated according to Tesla's method." Rolla glanced at Tesla and continued, "As a comprehensive consideration, the possibility that this signal came from an unknown cosmic civilization is still the greatest."
Chapter completed!