"Tear up!"

With the piercing sound of tape tearing, the five-meter-long red seal separated from the box and was thrown away by Chen Yu at an altitude of 3,400 meters.

In order to let the audience see clearly, he deliberately turned sideways, stood on the left side of the express box, and slowly lifted the lid on the left side of the box in front of the camera, revealing the light blue cylinder inside.

Then, Chen Yu walked to the right side again and lifted the lid on the right side. The whole picture of the product was finally shown in the eyes of Chen Yu and more than 20 million viewers......

[Nima!Cannon?]

[This cannon barrel is not very smart Yazi. 】

[It's a bit like Dongfeng Express!]

[It could be a nuclear bomb launch pad.] 】

【Electromagnetic Cannon Stone Hammer!Summoning Sister Cannon!】

[Obviously a planetary engine......]

[Up master, no matter how awesome you are, do you dare to go to the Forbidden City on Monday to broadcast live?]

"Hmmm......"

Taking four or five steps back, Chen Yu carefully observed the shape of the blue cylinder and frowned in thought.

Like many viewers, he couldn't recognize what it was even when he was there.

"Here, help. ”

Hooking his hand at the little peach, the two completely separated the express box from the product.

"Hoo ......"

Throwing the box, Chen Yu manipulated the camera to observe the cylinder 360° up, down, left and right, but still couldn't determine its true use.

"After the unboxing session, everyone should be like me, and they can't figure out what it is. From portals, to weather consoles, to floating castles, the more future products are, the more beyond our imagination. ”

Stretching out his hand, Chen Yu took down a card from the bayonet on the right side of the cylinder: "But fortunately, with the help of the manual, we 'ignorant' ancients can explore the mystery of the future." ”

As he spoke, Chen Yu skillfully activated the card switch and carefully slid to read.

"?"

As soon as he saw the name of the product, Chen Yu couldn't help but exclaim, and hurriedly sped up. And as the understanding gradually deepened, the surprise was immediately shocked, and then turned from shock to admiration...... He was still muttering to himself.

"Magical ......"

"It's so showy......"

"Unbelievable ......"

"Amazing!"

Because this card does not have the ability to project, only Chen Yu can see the content and instructions played, and the 20 million viewers in the live broadcast room are itching, but they can only wait anxiously, sending out a barrage of urging.

After more than ten minutes of "cold scene", Chen Yu put down the card, looked at the camera and was silent for a long time, and finally sighed: "It's amazing, how willful a designer it takes to create this kind of product." ”

"Do you know what it's for?"

[How do we know?!]

[Made! The anchor definitely did it on purpose!]

[Cameraman adds rice to the today.] 】

[This damn show effect! Don't sell it!]

[I don't know what you're talking about, I'm just here to see the female assistant.] 】

[See also the female assistant.] It's so hi to discuss with just a big iron rod?tm a bunch of!]

[I watched it in all the live broadcast rooms, with a total of more than 20 million viewers!

Inserting the manual back into the bayonet, Chen Yu stroked the smooth surface of the cylinder a few times, sorted out the wording for a long time, and said: "This product, it is difficult to explain it in one sentence or two. Because it involves a lot of knowledge about astronomy, chemistry, physics, aeronautics and astronautics. ”

"That's right, it's an aerospace product. A product that no one has ever imagined in 2020. All the previous technologies, even if they could not be created in modern times, have been described by scientists, families, or various cultural works. There is also theoretical support for each technology. ”

"But it's. Chen Yu patted the cylinder: "It is blank in human history." At least, I haven't heard of anyone, or any cultural work, that has seen its shadow. ”

After a slight pause, Chen Yu straightened his waist, recalled the knowledge he had learned in the past few weeks in his mind, and said loudly: "The unpacking link has ended, and then we will enter the introduction." I try to use concise language to explain the magic and absurdity of this product. ”

"First of all, there are only two ways for humans to go into space. ”

"First, rocket propulsion. 2. Aviation aircraft. The latter of these also requires the propulsion of rockets. So strictly speaking, when humans enter space, they can only be propelled by rockets. ”

"But because of the high cost of rocket propulsion, the scientific community has been trying to find a more efficient way. One of the most famous, and the most feasible, is the space elevator. ”

As he spoke, Chen Yu stretched out a finger: "Then in order to introduce the space elevator, I have to mention a character." Tsiolkovsky of Mao. For this name, the audience in the live broadcast room may not understand. But you must have heard of his title. ”

"He is revered as the father of astronautics!"

The earth is the cradle of mankind, but human beings will not stay in the cradle forever. That's what the great god said. ”

"This deaf fairy was born in 1857, when he didn't even have an airplane. But at that time, before mankind had yet to study how to rise into space, he began to study how to go to the sky, how to fly into space, and enter the universe. ”

He saw that the punctured balloon would be blown by the air current, understood the reaction force, and immediately created the principle of jet rockets, and completed the formula and calculation of the system. One of the formulas, also named after him, is called the Tsiolkovsky formula. ”

“v=v0xln（m0/m1）。 ”

"This formula for rocket velocity is very easy to derive with a little calculus. I will not delay on such simple issues. ”

[Ahh

【Show!】

[I feel the taunt of the wise. 】

[Mom asked me why I jumped into the toilet to watch the video......]

[Liberal arts students mean you have a grammar error.] (smiles)]

Supporting the mask, Chen Yu continued: "According to the formula, if you want to go to the sky, the jet speed must be large, so the mass ratio of m0/m1 should also be large. m0 is the original mass of the rocket, which is the mass left after the jet. What does the 'ratio' between the two mean?"

[I don't know.] 】

[I don't know +1.] 】

[I can understand every sentence, but I can't understand it at all.] 】

[I understand it, but I don't understand it at all......]

【Bull......】

After a pause, Chen Yu smiled: "It means that the quality of the fuel should be greater." Therefore, most of the mass of the rocket is fuel. That hasn't changed to this day. This is also the main reason for the high cost of space operations, which is too wasteful. ”

After completing the principle of jet rockets, the immortal went one step further, specifying liquid fuel, and then created the principle of multi-stage rockets...... Until he completed this series of great deeds, mankind did not even know how to build airplanes. ”

"Some viewers may ask, what does he have to do with Sky Elevator, and why do you want to focus on him?"

Because, the space elevator was also proposed by this god, and all the theories and calculations were completed, including the structural strength of the material, the height of the space elevator, the counterweight ratio, the balance point of 36,000 kilometers, and so on. As long as the materials in it meet the standards, mankind can directly build a space elevator based on the legacy of the father of astronautics. ”

In 2019, Japan and Huaxia have successively created qualified materials and have begun the space elevator construction plan, and at most 2050, the project will be fully launched, and everyone will definitely see it in their lifetime. ”

"But ......"

Chen Yu stretched out his hand and patted the surface of the cylinder: "With this thing, the space elevator project can be abandoned." It doesn't take 2050 to have the basis for building this product with the current technology of mankind. ”

"The only thing that limits the time of its birth is the brains of the scientific community. ”

"Its name is ......"

"Earth squirts!"