"It's been so long that I've forgotten that the big bald head is really insidious. Pen, fun, pavilion www. biquge。 info" The middle-aged man muttered in a low voice, retreated, and his body changed back to its original appearance. No, neither Cheng Mo nor Cheng Lin heard it.

"Who are you?" Cheng Mo asked again.

This is his, if it were someone else, he would have been stupid by this scene.

Cheng Mo is middle-aged, middle-aged is Cheng Mo, Cheng Mo's performance makes middle-aged people feel a little complacent.

It's a bit of a twist, but this strange scene is really happening.

"I am you, you in tens of thousands of years, hundreds of thousands of years. ”

"Tens of thousands of years, hundreds of thousands of years?" Cheng Lin also reacted from the confusion and asked. This time frightened her, and the suspense was too big, can hundreds of thousands be linked to tens of thousands?

"Little sister, what is the year?"

"The earth revolves around the sun for one year. ”

"Yes, the earth revolves around the sun for a year, three hundred and sixty-five days a year. According to this theory, Mercury has only 89 days in a year, and Pluto has more than 240 years in a year. ”

"It's convertible. ”

"Yes, it can be converted, but time can also be changed, according to the theory of this world. Matter travels at nearly the speed of light, and time has passed a year, but on Earth it may have passed hundreds, thousands, tens of thousands of years, and this time is also not convertible. However, under some rules, a year that has passed on Mercury is indeed a year, and a year has passed on Pluto, which is the same year, and it will have some impact on people, and it is by no means as simple as conversion. ”

This theory is obviously beyond the scope of Cheng Lin's acceptance, and the middle-aged man explained: "Time can also change, and you will be regarded as if I have come from a far, far future." ”

"Where are you from?"

"Little sister, it is also a very distant place, by no means on earth. ”

"Alien planets?"

"Alien planets? Haha, do you know how far away from Earth is the closest planet in the solar system and more suitable for human survival?"

"I've seen a very old film called Interstellar. Cheng Mo refers to the interstellar piercing technology in that film, although it is far away, the technology has developed to a certain point, and human beings can use wormholes to reach the other side of the universe.

"I also have some impressions of that film, some of the front are correct, and all the back are wrong. The middle-aged man interrupted him.

"Wrong?" asked Cheng Mo.

"Cheng Mo, do you know what three elements there are in this world?"

"Consciousness, Structure and Energy. ”

"It's too general, I'm talking about specific elements. ”

"Space, energy and matter. ”

"Wrong, according to this statement, where did the time go?"

"Four elements?"

"The four elements are not good, this is originally a broken world, the laws of space are not sound, the laws of time are not sound, and the four elements come from. ”

"The law of space, the law of time, the big world?"

"What is the universe? In ancient times, it was called the universe, and the four directions were called the universe, and if there is a sound law of time, it is called the universe, and if there is a sound law of space, it is called the universe. Let's not talk about the more esoteric laws of time, let's talk about the laws of space. Let me give you two examples, the distance from the Earth to Vega is more than 20 light years, and at the third cosmic speed, it will take more than 400,000 years to reach. ”

Cheng Mo calculated that the third cosmic velocity is 16.7 km/s, and the distance from Vega to the Earth does not take more than 400,000 years.

"If technology is further developed and we go to Vega at a speed close to the speed of light, hundreds of thousands of years will still pass on Earth. Moreover, if you look for a planet suitable for human survival from the vast space, you may find it, and the earth will be destroyed long ago. By the way, the faster the object is moving, the heavier it will become, and the heavier the object becomes, the more difficult it will become to accelerate. According to this theory, not to mention man, even if a particle is accelerated to the speed of light, the mass will become infinite. ”

Becoming infinitely massive means that there is not enough energy to accelerate it further, and it also means that it is impossible to truly advance its speed to the speed of light.

Cheng Lin was only in her second year of high school, and she had never learned this knowledge, so the more she listened, the more confused she became, and asked, "What about light?"

"Light is composed of photons, also known as light quanta, and its rest mass is zero, so it can reach the speed of light. ”

"Isn't light a substance?"

"It's matter. ”

"It's a substance, why is it zero?"

"You ask him. The middle-aged man pointed at Cheng Mo.

Cheng Mo spread his hands, he didn't learn physics, let alone quantum science. The theory of relativity also seems to mention that matter cannot exceed the speed of light, but he has no expertise in the theory of relativity.

He didn't learn...... Middle-aged people have not learned.

The middle-aged man said: "In the face of this problem, some scientists have put forward a beautiful hypothesis, that is, a theory in "Interstellar", which produces space folding through wormholes, so as to quickly reach the other side of the universe. What is a wormhole?"

"A wormhole is a space-time flint between a black hole and a white hole, where matter enters the black hole, travels from the wormhole to the white hole, and then reverses from the white hole to another universe, or the other side of the universe. ”

Cheng Mo's major is not astronomy, but this is simple space theoretical knowledge, and he replied immediately.

"Must go from into a black hole?"

Cheng Mo nodded.

"What is a black hole?"

Although there are many theories about black holes, they are all hypothetical.

"In fact, it is impossible for this world to produce space folding, and the speed of light is the maximum speed of this world, and it is also the law of this world. ”

In the past, scientists experimented that they made particles exceed the speed of light, but in the end they proved that the data was wrong. As for whether the speed of light is the largest speed in the world, Cheng Mo can't say, at least for now, the power of science and technology cannot achieve the speed of light.

The middle-aged man continued: "The world was created by the singularity of the Big Bang, and it is constantly expanding. But in the future, it will eventually return to this singularity, and this process is a collapse process. In fact, the world is expanding and shrinking at the same time, but now the expanding side is better than the collapsed side, so the world is expanding all the time. The collapse is the black hole, how can we break through the rules of this big world and come out from the other side?"

"This is not the most serious mistake of that film, not only did it pass through the so-called wormhole, but with the weak body of an ordinary earthling, he was able to enter the so-called fourth and fifth dimensional space, breaking through the two laws of space and time, is he a saint?"

The saints mentioned by middle-aged people are not saints on earth.

No, Cheng Mo also felt that the back of that film was too mysterious.

"This is the first example, the second example, the space of this world is only a simple length, width and height, but it cannot overlap the space...... Even if the saint wanted to make an overlapping space in this world, the amount of energy required was unknown. ”

"What is spatial overlap?" Cheng Lin asked confusedly.

"Look," the middle-aged man said, reaching out and grabbing the cloth, a huge white tiger-like animal came out of the cloth, but it was definitely not a tiger, its body was covered with tiny scales, and its limbs were thicker and more powerful, and it looked very ferocious and terrifying.

The tiger was caught inexplicably, and he yelled a few words, he was talking...... It's just that because of the different pronunciations, neither the Cheng Mo brothers and sisters understood what it was saying. But with the middle-aged man pressed into the cloth.

The middle-aged man thought about it, tens of thousands of years have passed, and some things are a little vague to him, and then he thought of one thing, and with a big hand, a strange dwarf tree was caught out by him, but it can't be called a tree.

As soon as it landed on the cloth, Cheng Mo and Cheng Lin saw that its roots were moving, and wanted to escape from the scope of the cloth, the middle-aged man reached out and scooped it into the palm of his hand, Cheng Mo and Cheng Lin seemed to hear the strange tree making a "squeak" sound.

Could it be a dendritic animal?

But it is really a tree, with roots and branches and stems and leaves, but it is very beautiful, the roots shine with golden luster, the trunk is green like jade, but the leaves are fiery red, like fire, and there are a few small fiery red fruits between the branches.

The middle-aged man plucked a fruit and pondered for a while before squeezing out a drop of fruit from it...... So a drop, it is the back, at the beginning of this "drop", Cheng Mo can hardly see it, but the middle-aged man flicked it, this "drop" flew like Cheng Lin's mouth, it became bigger and bigger, first a trace of red flashed in the night sky, and by the time Cheng Lin's mouth arrived, it had become a pearl-sized juice.

"It's so fragrant, it's so hot," Cheng Lin looked at the fruit while savoring it, which clearly meant that you are my brother, how can you be so stingy.

The middle-aged man looked at her dotingly, and said with a smile: "Little sister, it's not that my brother is reluctant, the key is that your body can't afford it, and one drop is enough." ”