Li Li didn't feel too surprised when he heard Cheng Xin's words added later, now that there are monsters, abilities, and telekinesis, it is not strange that aliens appear, he let out a long breath and said slowly: "I understand, just like human beings have always had special functions, but now the probability of this special function appearing has also been greatly increased because of the opening of the space channel." ”

Cheng Xin nodded with a smile and agreed, and Li Li continued: "How can you infer that there will be alien creatures who will break through the space channel and come to Earth? ”

"A lot of coincidences, this time the largest space passage is in Tunguska, Tunguska had a big explosion at the beginning of the nineteenth century, according to the monitoring of the explosion power at that time is equivalent to a hundred million yield, the power of a nuclear bomb explosion, now human beings can not make such a huge yield of nuclear bombs, the second earth has existed for more than 4 billion years, we can currently trace back to less than 100 million years of life, and the history of human civilization is less than 5000 years, and in the first ten years of large-scale mining of combustible ice waves, We have found some strange biological remains, and some strange weapons, you must know that nothing made by human technology will not be stored in nature for no more than 100,000 years, and these weapons have existed for millions of years or even beyond, and the unknown substance imprisoned in the third combustible ice, I suspect that a higher intelligent creature has put it in, this substance is unknown so far, and we have no clue. Cheng Xin said the speculation in his heart in one breath, and put these questions in front of Li Li's eyes.

Hearing Cheng Xin's speculation, although Li Li didn't understand it very well, he also faintly felt that something was wrong, especially the fact that the Tunguska explosion was conclusive, and the most powerful atomic bomb in human history, that is, the 50 million ton yield Tsar nuclear bomb manufactured in the Khrushchev era of the former Soviet Union, was far from the energy level of the Tunguska explosion.

And after hearing Cheng Xin's mysterious remains and weapons found in the wave of combustible ice development, Li Li thought of the mysterious pendant given to him by his uncle who developed combustible ice in the South China Sea, and he also frowned and thought about it, which was not a coincidence.

"Then these alien creatures are going to exterminate humanity and destroy the earth?" After a while, Li Li raised his eyebrows and asked with his hand touching his chin.

"Occupation? You also think too highly of us human beings, it is too easy for a civilization that can break through the space channel to exterminate human beings, I can think of countless simple and economical methods, such as accelerating a coin to close to the speed of light, and then shooting this coin towards the earth, because this coin is close to the speed of light, its kinetic mass will be infinite, so it can destroy the earth and exterminate human beings in an instant, or stretch a mountain the size of an aircraft carrier to the earth's low earth orbit, and make the hill do free fall, The kinetic energy generated when the hill hits the ground can also exterminate the entire human race, and the price paid by this level of civilization to exterminate human beings is equivalent to our meal. Cheng Xin glanced at Li Li with disdain, the civilization that can open up space channels must be a highly developed civilization, such a civilization has surpassed human problems by several orders of magnitude, and it is indeed easy for them to destroy a planet, just like a human being trampling an ant to death.

"You mean they came to Earth for some other purpose?" Li Li fell into thought and muttered to himself, he understood the meaning of Cheng Xin's words, the gap in science and technology was too big.

"Obviously, they want to find something on the earth, or use the earth to achieve something, but now I have too little information to analyze it." Cheng Xin sighed, there was a hint of helplessness in her beautiful eyes, and she couldn't help but have a trace of practice, this woman was really beautiful.

Li Li couldn't help but be surprised by this woman's thinking and analysis ability, the secret path is indeed the most perfect breeding carrier in the monster's mouth, such an IQ, such a comprehensive ability, if caught by the tentacle monster, it is really unimaginable.

Seeing that Cheng Xin was a little sad, Li Li hurriedly changed the topic and said with a smile: "Dr. Cheng, I didn't expect your combat strength to be so strong, maybe you will become the most powerful warrior of the human race in the future." ”

"Fighting is your man's business, no matter how strong my ability is, I'm just a woman, and I position myself as a logistics researcher." Cheng Xinyan smiled, like a hundred flowers blooming, her tone was soft, gentle and beautiful, and her appearance at this time could not be compared with the battle state just now, and she was completely like two people.

Li Li thought of the space ring again, and still couldn't help asking, "Is there a civilization in this universe that can make space storage in another dimension?" ”

"At present, I don't know if there is a civilization in the universe that can create a different dimensional space, but a civilization that can create a different dimensional space is an existence that we can't imagine, this civilization level has basically reached the apex of the cosmic civilization, this civilization can use their timeline as a reference system, can reach any corner of the universe in an instant, can already master some cosmic laws, and can even carry out dimensional strikes to reduce the dimension of civilizations that need to be destroyed." Cheng Xin's big eyes showed curiosity when he heard the space storage, but he didn't ask, and looked at Li Li and explained seriously.

Hearing this, Li Li secretly made up his mind, he wanted to keep his secrets well, he was even more concerned about the space ring, and he was even more curious about the owner in the mouth of the mysterious old man, and the civilization that could make this space ring was unimaginable.

"Timeline reference, instantaneous." Li Li muttered to himself a few times, his face was dazed, obviously unable to understand the meaning of Cheng Xin's words, and then asked: "Since they can reach any place in the universe in an instant, why do they need to open up a space channel, it is better to go directly to the earth to save more trouble." ”

Cheng Xin was directly stunned by Li Li's words, and after a long time, he shook his head and said: "Note, what I'm talking about is using their timeline as a reference, a very famous experiment in the past, two exactly the same, very precisely designed clocks to match the time, one on the earth, the other on the space station, a year later, the clock in the space station returned to the earth, and found that they were wrong by a few seconds." ”

"It's normal to miss a few seconds in a year." Li Li smiled, his family's clock would miss a few seconds a month, let alone a year, but he didn't understand the meaning of Cheng Xin's words, it is difficult for high-precision clocks to miss a second for hundreds of years.

Cheng Xin rolled his eyes and looked at Li Li, and said with a speechless face: "This is the time dilation effect, if you fly at the speed of light to the constellation of Centaur 40,000 light years away from the earth, it will only be a second for you, but for us it will be a full 4 years." ”

"You mean, if I run a few times at the speed of light towards the constellation Centaur, you're all old, and I've only been in less than a minute? I'm still young, and it's only a blink of an eye for me, but decades for you? Li Li opened his mouth and couldn't believe it, although he had not studied the theory of relativity and did not know the time dilation effect, but after all, he graduated from university engineering, and soon grasped the key point from Cheng Xin's example, and faintly understood the idea of time.

"That's right, that's it, there is no time in this universe, time is just something we deliberately impose to facilitate our understanding of spring and autumn, birth, old age, sickness and death, so if this civilization is millions of light years away from the earth, they fly to our earth at the speed of light, it is only a second for them, but for us millions of years have passed, the vicissitudes of life, at that time no one can say what the earth has developed, and their time is frozen, only a second has passed, That's why we need to open up a spatial channel so that everyone's timeline reference system is the same. Cheng Xin explained to Li Li like a primary school student, but Li Li is not to blame, after all, Einstein's theory of relativity and the time dilation effect are very abstract, and they cannot be thought of by conventional thinking at all, and the concept of time has been deeply ingrained in the hearts of human beings.

Li Li nodded, and suddenly realized: "I see, I finally understand an example that the physics teacher gave me in junior high school, after a pair of twins were born, my sister was sent to a spaceship to sail away, and my sister stayed on Earth, and after fifty years, my sister met again on Earth, and my sister has become an old man over half a hundred years old, while my sister is like a twenty-year-old girl, this is the time dilation effect." ”

This example has troubled Li Li for more than ten years, when he has not been able to understand why the twin sisters met again, one became an old man, and the other was still in the prime of life, this is because the timeline reference system of the two is different, with her sister's reference system she has only passed 20 years, with her sister's reference system is 50 years, there is no time in the universe, time is just a concept that human beings come up with in order to understand the sunrise and sunset, birth, old age, sickness and death.