Well, the problem goes back to the Earth explosion.

If it is true that Noah civilization has destroyed the earth because of various conspiracies, according to the logic of Lanbo, it is really possible for human civilization to pass the Great Filter, which is a rare civilization in the universe.

But what civilization has destroyed the earth, it is clear that the scientists here can not have any answer.

For the earth explosion, scientists have analyzed for a long time, only know that the destruction of the earth is likely to be the work of an alien civilization, rather than a natural phenomenon.

As for what civilization destroyed the earth, it can only be said that we do not know, human beings have never even seen a living alien civilization.

For a moment, the whole venue was silent, and everyone would not know what to say for a moment and a half.People really know too little about the universe.

“Well, gentlemen, let’s not think about the explosion of the earth for a moment.With regard to the theory of the Great Filter, I would like to say a few of the remaining pieces.”Heigal took the lead in breaking the silence, "and these, we human beings have not yet crossed."If one of them is true, then this terrible Great Filter is still ahead of us...”

The optimistic Rambo has already finished his point of view, the pessimist's turn to play, and Yu Yifeng is quietly waiting.

“First, the difficulty of interstellar navigation technology is likely to exceed that of human imagination.”

"Interstellar navigation, first of all, the spacecraft will be accelerated to the sub-speed of light, which requires a large amount of energy, and controlled nuclear fusion technology is only the first step."Only controlled fusion technology can provide so much energy.

Secondly, the spacecraft itself needs a lot of new materials with excellent performance, and the long sailing time also requires large-scale hibernation warehouse technology and so on.Maybe some of the technology here is extremely difficult...”

Because of the difficulty of all kinds of interstellar navigation, all civilizations are trapped on their own planet.Just like us humans, we can never cross out of the solar system ... I think this one is a possibility of a great filter.”

The atmosphere of silence was slightly broken, and the scientists whispered to discuss it.For humans, almost all interstellar navigation technology, including engines, materials, energy, and so on, are not up to standard.

If science and technology are barriers, and almost all civilizations are blocked by them, then the possibility of interstellar navigation is greatly reduced.

"No, Professor Heigl, I have a different opinion!"

It was Dr. Rambo, who jumped out again: "In addition to sub-speed of light spacecraft, different civilizations can also send electromagnetic waves, or send unmanned detectors and other means."These things will not disappear for millions of years in the universe, can't civilizations communicate in this way?"

“Why have we never found out?Can you explain that?”

Heigger thought for a moment and motioned with his hand: "If you ask people why they have not received an alien electromagnetic wave?"I think it has to do with the nature of electromagnetic waves.”

"Regardless of the power of the emission source, the intensity of the electromagnetic wave will decay with distance, probably inversely proportional."Moreover, the universe is full of a large amount of electromagnetic radiation, and alien electromagnetic waves are likely to be interfered with so that human instruments cannot be distinguished.

I think it is possible that our human civilization has already received the greetings of the electromagnetic waves of extraterrestrial civilizations, but these opportunities have been missed because these electromagnetic waves are too cluttered or too weak in intensity.”

After all, electromagnetic waves are not suitable for long-distance transmission.Unless their electromagnetic waves emit the same power as a star, but that's impossible."

This explanation is more reasonable.Light is also a kind of electromagnetic wave, even if it is a powerful star, the stars on the earth are so small, not to mention the power of only a few thousand watts of instruments, even if the power of these instruments amplified 10,000 times, it may not be able to receive.

“Where is the unmanned detector?”Unmanned detectors won’t weaken, so how do we explain it?”Rambo asked incredulously.

Heigl thought about it, saying, “There’s a similar problem with unmanned detectors like you’re talking about.”It flies slowly, and it could take millions or even tens of millions of years to fly to another star.”

“But there are too few human launches for such unmanned detectors, which I have not counted, but there are hundreds of them.”

"Millions of years of navigation time, these unmanned detectors have long been out of electricity, they can only rely on inertia floating in the universe, perhaps collide with meteorites, may fall to some ordinary planet, all kinds of accidents are possible."

Even if it is very lucky, it happens to pass through a living planet, because it is a dead thing without electricity, it may be directly ignored as a space junk or a comet.

“So every detector has a very low probability of being captured by an alien civilization, one in a billion or one in a billion, or less?”

“If all civilizations, like us, launch hundreds of probes aimlessly, then our Earth civilization does have a very low probability of receiving them.”

Of course, if they launch hundreds of millions of probes every year, there is a high probability that they will be discovered by humans.However, launching hundreds of millions of probes every year is economically almost impossible.”

"That's my explanation."Heigl finished, looking quietly at Rambo.

Rambo thought for a long time, finally sighed and sat down hard.For a moment and a half, he had no rebuttal.This statement should also be reasonable.

Hearing this of Heigl, Yi Feng felt a little out of breath.

If there are many civilizations in the galaxy that have evolved wisdom, but because of the distance from too far, trapped on their own planet, and they can never communicate with each other, it is too sad and too cruel...

The universe is really cold...

Yu Yifeng suddenly thought of that dark space, that piece of dark starlight representing human beings, really too small, too weak to wind...

The smallness of civilization compared to the vastness of the universe is really shocking and too desperate.Fortunately, Professor Heigl’s statement is just a guess, not necessarily true.

When the crowd was silent, Professor Heigl said again: "This is the first possibility I have said, technical barriers."There is a second possibility: destructive technology.”

“The ocean of truth is endless, and we humans are like children picking up shells on the beach.”In order to image a little, I divided the shells into three categories: 1. white shells, representing the technology that is beneficial to mankind;

Red shells, which represent technologies that have the potential to destroy humanity;

Black shells represent the technology of extinction with high probability.”

“While we all want to pick up white shells, the process is random and completely uncontrollable.So far, most of the shells we have found in humans are white, but we have also picked up red shells.”

“This red shell is a nuclear weapon!”

Nuclear bombs, which have the ability to destroy human civilization, are still relatively restrained and have not been completely destroyed.So, it's just a red shell."

“But what if we find the black shell?”In the face of this black shell, where do we humans go?Will we be destroyed?”

“Perhaps, the vast majority of the more developed intelligent civilizations have been destroyed by black shells.So, this is also a possibility of a big filter...”

Heigal's a series of questions, so that Yi Feng is a little creepy, so he, the universe is too dangerous, is really a step-by-step crisis, said is not too much, even human protection God "science and technology" are likely to be eaten at any time!

But what Heigl said is really not too much logical flaw, it is reasonable...

So, what is a black shell?Is it possible for humans to get around them?

Some people speculate that it is a biochemical virus or bacteria, a disease that no one can survive.It may be a zombie virus, it may be a mutated HIV, etc... it sounds eccentric anyway, but these are all possible...

There is also speculation that it is artificial intelligence.

The danger of artificial intelligence is that it is completely uncontrollable and unpredictable.Many people believe that the kind of real thinking artificial intelligence, once it appears, will bring the ultimate disaster to mankind, and they can destroy humans in minutes.

It is also believed that it is a nano-robot.A nanorobot capable of self-replicating, if left unchecked, will reproduce itself in the form of exponential growth.Then... they will spend a few days on the planet’s resources!