Chapter 309: Window Period Hypothesis

Seeing Yue Yuan walking next to him, Gan De turned his gaze to the starry sky outside the porthole again, and then said leisurely: "In our previous discussions, there were many hypotheses about the Fermi Paradox, but now, like a planetarium, Hypotheses, zoo hypotheses, conspiracy theories, and many other hypotheses have been eliminated by us.

What remains are parts of the dark forest, aliens who are unable to detect visiting aliens due to the low level of technology in the Earth's era, and the Great Filter. "

Yue Yuan nodded. He knew every hypothesis mentioned by Gan De, and it is true that many hypotheses have been falsified by today's humans.

Like the zoo hypothesis and the planetarium hypothesis, the former says that aliens use the earth as their zoo or nature reserve, so various alien civilizations have reached an agreement not to interfere with or contact humans. The latter says that human beings are raised by advanced civilizations for experiments.

These two have been declared untenable after the solar system and the Centauri triple star were dusted by unknown civilizations. As for the dark forest, based on mankind's experience along the way, scientists have reached a unified conclusion, that is, the dark forest exists among malicious civilizations, and those civilizations may attack other civilizations when they see them.

However, the purpose of the attack is not to destroy for the sake of destruction, it should be for the opponent's technology, well, science and technology.

And the big filter filters, there are. And it has always existed. The three-stage filters that humans have summarized before are only applicable to the process from the birth of life to the birth of wisdom. All races with intelligence have passed through this stage of filters.

But scientists believe that the Great Filter still exists. Although they don't know where or at which stage it is now, since they learned about the technical barriers, they are sure that it must still exist.

Yue Yuan still remembers what the Awakeners told humans about their purpose of coming to the galaxy. Perhaps the so-called limit of wisdom is one of the great filters.

I wonder if there are still many great filters to filter the civilization of the universe before reaching the limit of wisdom.

Oh, by the way, there is also the brain-in-a-vat hypothesis, but this hypothesis cannot be proven or falsified at all, and it has the potential to be a bully. For example, the original brain-in-a-vat hypothesis could have been falsified when humans encountered other alien civilizations. However, those who support this hypothesis can say that there is a larger 'brain', or even say that the entire universe is one. Brain in a vat.

For the current human civilization, it is meaningless to discuss these things, so Yue Yuan will naturally not use such words to talk to Gan De at this time. He will just wait quietly for Gan De to continue.

Sure enough, after a while, I heard Gander continue: "There used to be a hypothesis called the isolated island hypothesis, which said that most civilizations were trapped on isolated islands in the universe. Now it seems that this hypothesis is valid to a certain extent. is correct.

The home star of every intelligent civilization is an isolated island to the home stars of other intelligent civilizations. Before technology reaches the first level of civilization, every star system is an isolated island.

Even for those powerful sixth-level civilizations, the river systems are still isolated islands to them. This universe is so vast that even the Awakener has to go through it to get from one isolated island to another. We have gone through countless hardships and vicissitudes of life.

Perhaps civilizations that have reached a certain level are no longer interested in primitive civilization. They have their own goals, either to explore the endless unknown, to climb higher scientific peaks, to pursue a certain ideal, or for some reason. I have to spend my whole life working for something.”

Listening to Gan De's words, Yue Yuan first nodded in agreement, and then raised his own question: "Dr. Gan, having said that, according to the situations you mentioned, it doesn't matter which one they are. In the age of human earth, outsiders The probability of being visited by a star shouldn’t be 0.”

"That's true. It stands to reason that there are so many civilizations in the universe, no matter how low the probability, they all have visited the earth." Gander seemed to know that what he just said could not really answer the question of Fermi Paradox, so he Then he said:

"So in my opinion, there are only these few possibilities left. First, we have been here but humans didn't notice us, just like we did on the kobold planet before. If we didn't do that deliberately, the kobolds would never have discovered us. .

Therefore, aliens may have visited the earth in a very early era. Of course, this argument is meaningless to discuss now. It is just creating a few more unverifiable hypotheses for us. "

Hearing what Gan De said, Yue Yuan couldn't help but remind him: "Dr. Gan De, you seem to have forgotten one thing."

"Oh? Chief, just say it bluntly." Gan De looked at Yue Yuan, his words were full of true feelings, and he was not angry because Yue Yuan said what he was looking at.

Yue Yuan didn't talk nonsense: "The living planet is the treasure of the universe!"

"Hmm" Gander was stunned, and all kinds of information such as 'life potion', 'Kuntai civilization's home planet was packed away', and 'biosphere resources' suddenly appeared in his mind.

"I was indeed negligent in my thinking." Gande suddenly came to his senses.

It is true that the living planet is the treasure of the universe. If this is true, in the 4 billion years since the birth of life on the earth, no advanced civilization should have visited it, otherwise it would have been packed away long ago.

Four billion years of natural evolution history of life. How many treasures and secrets of the universe must be hidden. No civilization can resist that temptation.

Naturally, humans cannot resist this temptation, so humans have already marked the few life planets they encountered on their star maps, especially the Wolf planet with a left-handed DNA biosphere. If they didn't have the technology to pack them away, , humans will definitely not let it go.

At this moment, Gander thought for a moment, and then said: "If we add this condition, there are only two possibilities left."

"Which two kinds?" Yue Yuan asked.

Gander twirled his beard: "The first possibility: The solar system's luck is so bad that no alien civilization has been found in 4 billion years."

After Gan De said this, he looked at Yue Yuan and saw that the latter was about to say something, so he quickly raised his hand to let the latter listen to what he had to say.

"Ahem," as if he knew what Yue Yuan wanted to say, Gan De pretended to clear his throat and continued: "Of course, the sun is just an ordinary star, and it does not have any ethereal luck to protect it. It is a triple combination with the centaur. The fact that the stars were bombed together is the best proof.

Therefore, there is only the second possibility, and that is the universe. Oh, or the Milky Way. For some unknown reason, the Milky Way experienced a civilizational window. We cannot tell when it was. Maybe it was 2 billion years ago, maybe It was 3 billion years ago, 4 billion years ago,

In short, there should be a period when the civilizations in the universe decreased sharply for unknown reasons, so that for a long time, no civilization discovered the earth. "

"Dr. Gan is talking about advanced civilization, right?" Yue Yuan pondered.

Gander nodded: "Yes, it is the window period of advanced civilization. Although it is incredible, there may be such a period when the advanced civilizations in the Milky Way disappeared for unknown reasons. This led to the smooth sailing of life on earth on the long evolutionary road. ”