"Why are you a little weird today?"

"Am I weird?"

Huogu's eating action noticeably paused, and then he recovered, responding in an unsatisfactory way to conceal his gaffe, and how could this behavior escape Kailena's eyes.

Karenna sighed with an expression of ‘Don’t hide it, I’ve seen it through’.

"Every time you eat fast, you are always anxious to go back to the library to read, but today it is not like this. For a monster who is addicted to learning, doesn't this explain the problem?"

Huo Gu's head turned aside, his gaze scanned the pedestrians outside through the restaurant window, his eyes sharp like a falcon.

When Karenna saw Huogu tilt her head, she didn't think too much about it, just because she was poked at the center to make her temper angry.

"I want to slow down the pace of life, but you, didn't you want to explain to me?"

"Uh, what does it mean?"

When asked by Huo Gu suddenly, Karenna was slightly stunned, and she thought about it carefully, and with a hammer in her palm, she seemed to understand something, and looked at Huo Gu with a sudden realization.

"Oh, you are expecting me to answer your last question, right? It is indeed a question that makes people think about it."

"you understood?"

Huogu's actions were once again, but this time it was different from before. It was surprised that Karenna was able to penetrate. According to Karenna's impression of this incident, it is not so easy to learn in itself, and the talent is not smart, yet There is not too much self-motivatedness, at best it can be regarded as medium in the whole group.

Such a person actually claims that he has penetrated the problem from the two prompts, which is very suspicious.

"of course."

I saw that Karenna was straight and angry with her hips akimbo, as if she was proud of her victory.

She cleared her throat and began to explain the inference information she had learned from the two prompts Huogu gave that day.

"Today's empire has been able to make a certain mass of detectors reach the speed of sublight, and the diameter of our river system is about 180,000 to 200,000 light-years, and we can get the maximum value. The river system needs 200,000 years to answer this question."

"In other words, assuming that there are other civilizations in the river system, you only need to reach the current height of the empire 200,000 years before the empire, and launch a probe, the empire should have been in contact with them now."

"This is only 200,000 years earlier than the empire. If it is an extraterrestrial civilization 10 million years earlier, 100 million years earlier, the Serines might have known their existence when they first came into contact with the universe in the era of great powers. , Or establish communication, because these civilizations have already occupied the entire river system."

"However, the actual situation is quite the opposite. We have never contacted any aliens except Amoeba, the alien civilization of our own star system. The entire universe is very quiet."

That's right, this is the famous "Fermi Paradox" on earth, one day in 1951, proposed by Fermi-"Where are they all?" A series of scientific derivations from this question.

Now, in a certain corner of the universe that does not know when and where, on the home planet of alien civilization far away from the earth, Huo Gu asked that question again.

"Yeah, so why is this?"

Celine did not discover this scientific problem. Although they were aware of the concept of “alien”, they did not realize the Fermi paradox. Therefore, when Hogu gave a hint, Karenna did not immediately give it. Huogu replied.

Everything she knows now is only based on the two tips given by Huogu.

When discussing academic issues, Karenna gradually put away her usual jokes, and became more like a scholar.

"From this question you asked, three explanations can be derived. The first one is that we, Cerines and Amoeba, were the first civilizations in the early period of the river system. Therefore, there has been no regular signal flooding of the whole river system. ."

"Second, the regular signal exists, but because our technology is too far apart, even the readable regular signal is mistaken for such a natural phenomenon and ignored."

"The third is that those civilizations are all perished, without exception, and they have not yet reached the current height of the empire. Otherwise, according to the continuation of the civilization itself, even if it encounters an inevitable crisis of extinction, it will at least prove its existence. The evidence of this stay."

Later, Karenna explained why the detector was used as a tombstone.

"The detector is an excellent choice for tombstones, because it will diffuse information, and it will be easy for other civilizations to learn about the destroyed civilization. When accelerating to sub-light speed, the scale reduction effect will extend the life of the detector in a disguised form. It’s tens of thousands of times or even hundreds of millions of times, crossing the entire river system, the normal time is hundreds of thousands of years, but for the detector, it may only have been a few years~lightnovelpub.net~Ancient, What you were referring to is imminent, does it mean this?"

After explaining her understanding, Karenna looked at Huogu with complicated eyes, because this bad guy was different from ordinary people's thinking and made her realize a terrible thing.

At the same time, unparalleled admiration was secretly rising in her heart, but soon, Karenna's feeling of admiration disappeared because of Huogu's next words...

"You can think of it as a surprise to me. After all, I always think you are a fool who doesn't study much."

Ignoring Kailena, who was a little stiff, Huo Gu continued to speak for himself, explaining why he preferred the third kind.

"The first kind is too proud. The river system is as old as the universe. It has a history of tens of billions of years. Whether it is a Serine or an amoeba, they are just a drop in the ocean in the vast years. It is simply the first batch. Make people laugh out loud."

"The second type can only explain those advanced civilizations that have existed for a long time, but the civilizations that are 200,000 or 300,000 years old like your example are not included. Therefore, these civilizations can only be explained by the third type. "

Hogu paused and put down the cutlery in his hand, because it was finished.

"There is an unknown great horror that will wipe out these civilizations, and you have made a point of inference wrong."

"What's wrong?"

Kailena showed a thoughtful look. She shouldn't have missed anything. Where is the mistake?

And then, Huogu told her where she was wrong and why she was wrong.

"Why do you have to assume subjectively that no civilization can reach the height of an empire? Amoeba can also achieve sublight speed? The two known civilizations have reached this level, can it be assumed that Is it a common phenomenon for civilization in the universe to reach sublight speed?"