The so-called variable star, as the name suggests, is a star that can change its own luminosity. There is a kind of star in the universe whose luminosity is not stable, but suddenly changes its brightness at some point.

There are two types of variable stars, one is pulsating variable star and the other is explosive variable star. When he was in the Aquila Nebula, Xiao Yu manipulated a satellite to hit the white dwarf, which caused the nova explosion of the white dwarf, causing the brightness of the white dwarf to increase tens of thousands of times in an instant, which is a typical explosive variable star.

In addition to the white dwarf accident, the process by which aging stars explode into neutron stars or black holes by supernova explosions is also a mechanism for the formation of variable stars. In ancient China, a supernova explosion was observed, which created the famous Crab Nebula, and the luminosity of that star increased more than 100,000 times when the supernova explosion occurred, when there were two moons in the sky at night. Its luminosity can be seen even during the day. This is an explosive variable star.

A pulsating variable star is a change in the luminosity of a star due to its internal mechanism during its evolutionary stage. This red dwarf star obviously cannot be an explosive variable star, it can only be a pulsating variable star, but after a simple analysis, Xiao Yu found one point, that is, this red dwarf star cannot be a pulsating variable star.

Neither an explosive variable nor a pulsating variable star, what could be the reason for the change in its luminosity?

Xiao Yu first ruled out the possibility of interstellar dust occlusion causing a change in luminosity. Because interstellar dust cannot block infrared rays, if it is caused by interstellar dust occlusion, the infrared band should remain stable when its visible band luminosity changes. However, Xiao Yu saw that the visible light and infrared rays of this red dwarf star fluctuated according to a certain law at the same time.

Xiao Yu showed great interest in this.

"Could it be because of some mechanism that I don't have the hang of? What caused this anomalous change in photometry? If this is true, it would be a big discovery, and maybe I could develop a new theory. ”

Xiao Yu happily arranged tens of thousands of spacecraft into an array of telescopes, and aimed his lens at this ordinary red dwarf.

When observing the abnormal luminosity change of this red dwarf star, Xiao Yu was keenly aware that the ghost clan attached to the star seemed to fluctuate a little. Its little movement caused the entire star to be violently active, and at this moment, the stellar wind intensity of this star increased by at least a hundred times.

"Seniors. What's wrong with you? What's the matter? Xiao Yu asked with some confusion and concern.

The Ghost Clan's answer was a little hesitant, and after a while, it replied, "It's nothing, it's a long rest, and you always have to move your body a little." Kindness. How has your technology progressed during this time? Anything is going on? ”

"Seniors. Thanks to your generous shelter. My technology has advanced very rapidly, and during this time, my negative matter cannon is close to the actual combat level, the tachyon shield jishu has made a breakthrough, and a new type of computer has been successfully built, decades later. I will surely have the ability to defeat the fleet of the Murlian civilization and carry on your desires. ”

The ghost clan was silent again. After a few minutes, it replied, "Good, good." You're doing a great job. Well, I noticed that a red dwarf star twenty light-years away seems to have some kind of anomalous change, do you know what that means? ”

"Did you notice that too?" Xiao Yu said, "I am conducting research in this area, and if there is any breakthrough, I will tell you." ”

"Well, I have an ominous premonition that this change seems to have been caused by the arrival of some malicious liliang. For the sake of your safety, and for the sake of the implementation of my last wishes, after you have the results of your research, you must tell me that you must not make decisions without authorization, so as not to cause irreparable losses. ”

"Haode, I will follow your teachings." Xiao Yu replied respectfully.

At this moment, more than twenty light-years away from Xiao Yu, this collection of many consciousnesses had already left the red dwarf star, quietly waiting for something.

"According to calculations, at this time, the light from this star has been transmitted to the main civilization, and life and death are decided here."

"Yes, if even the main civilization can detect the strange changes in this star, then there is no reason why the previous generation of ghost clans can't detect it. I'm afraid that the previous generation of Spectres will use this to deduce that this is the cause of us, and that our presence will be exposed. ”

"It doesn't matter, it takes twenty years for the light to be transmitted, and in those twenty years, we have traveled tens of light-years and come in the other direction. Even if the previous generation of Spectres could deduce anything from this, it would only know that we were here, and it would be impossible to find out where we were due to our special means of concealment. ”

"The only thing to worry about is whether it will become wary of the main civilization because of this, and the main civilization will not be able to carry out its own jihua. But this means of communication is the only way we can think of, and we can only do it here. The rest depends on our creation, and on whether the main civilization is capable enough to solve the current crisis......"

"yes. This time the situation is more dangerous than the last time we happened to encounter the fleet of the Guardian Civilization and fought desperately to escape. Our Lord civilization has experienced too little and is still too easy to trust others. He has not yet grasped this truth, in this dark universe, no existence can be trusted except us. Any existence will only have its own existence as its highest interest, and in this universe, where can there be a civilization that sacrifices itself to fulfill others? ”

"There's no point in discussing this. Who in this universe is not like this? Even ourselves, isn't it by killing the rest of the civilizations that we can achieve our own development? During these times, although we have not been in contact with the main civilization, and we cannot contact the main civilization, we can yujian, the main civilization during this time, it is estimated that there are not a few civilizations that have been extinct. ”

"All we have to do is wait. If all goes well, the main civilization will definitely find a way to contact us, so keep an eye on the movement of that strange star. Our vitality is maintained by the main civilization. Anyone who lives is alive, and everyone who dies is dead. ”

After some arguments, the ghost clan hidden in the corners of the universe fell silent again. They quietly conceal their whereabouts, relying on the unique methods of the ghost clan, evading the search of the previous generation of ghost clans, and waiting for the dawn to appear in the dark night.

At this moment, Xiao Yu, who is next to the strange star, is still continuing to observe this red dwarf. But what Xiao Yu couldn't figure out was that the strange change in the luminosity of the red dwarf star this time seemed to be accidental, that is, it only appeared once, and there was no more in the future. At least, during the period of Xiao Yu's observation, the red dwarf star was calm and quiet, completely showing the properties of an ordinary red dwarf, without any peculiarities.

So far, Xiao Yu has not realized that there is a certain signal in these photometric changes, but only studies them as some special phenomenon that he has not yet understood and mastered.

Looking at the red dwarf star that had calmed down, Xiao Yu thought to himself, "After dealing with the fleet of the Molian civilization, I must go to the red dwarf star to take a look and see what is going on with it." ”

Thinking like this, Xiao Yu completely gave up his research in this area, but handed over all the shiyan data to the red dwarf research team of the Stellar Science Research Institute under the Central Academy of Sciences, and let them slowly carry out research, and Xiao Yu himself once again focused on the development of science and technology.

Time passed slowly, and after about a month, Xiao Yu received a message from the aging ghost clan.

"My junior, how is your research on the anomalous photometric changes of that red dwarf star? Are there any new discoveries? ”

At the moment of receiving the message, Xiao Yu had a little doubt in his heart, "In the past, I took the initiative to contact the predecessors of the ghost clan, it rarely took the initiative to contact me, and it has not taken the initiative to contact me once recently, but for the sake of this red dwarf, it took the initiative to contact me twice in a row, is this red dwarf so important?" ”

Thinking so in his heart, Xiao Yu still responded respectfully: "Senior, I have conducted some research on this aspect, but unfortunately, I have not made any progress and found nothing. ”

"Hmm......" the aging ghost clan muttered for a moment, "and the ominous premonition in my heart has become stronger. I have a gut feeling that the anomalous behavior of this red dwarf star will be the beginning of a catastrophe. And you, most likely, will not be able to withstand this disaster and die. So, you have to step up your research in this area, and then tell me the results of the research, and I'll figure out how to deal with it. ”

Hearing what the aging ghost clan said, Xiao Yu was also inexplicably nervous in his heart. During this time, Xiao Yu had already established trust in this aging ghost clan, and, subconsciously, began to regard it as his elder.

"Haode, senior, please rest assured, I will continue to conduct research in this area, and if there are any research results, I will definitely inform you as soon as possible."

"That's fine, you go ahead with your research, I'm going to rest for a while......" (to be continued......)