Wang Sihan always has so many problems, in fact, he can't be blamed, although he has received a certain amount of modern education, but even if he accepts it all, it is just the knowledge of more than a thousand years ago, which is too different from modern society.

"Brother Jingtian, you said that the maximum speed of the galaxy spacecraft is 365 times the speed of light, so what is the speed of information transmission, the earth used to be transmitted through optical fibers, but in the universe, what is it transmitted, will its transmission signal attenuate!"

"The speed of information transmission is 3,650 times, which is ten times that of galaxy spacecraft, but even at this speed, it will take too long to transmit from the center of the galaxy to us, seven or eight years." I looked at Sihan, and he still looked serious and studying hard.

"Modern information transmission is with quantum signals, quantum signals have the advantage of non-replication, so its security is also very high, in the universe every dozens of light years there will be a large energy relay space station, through this relay station signal energy will not be attenuated much, and each relay station will have a backup station to prevent the entire communication system from being paralyzed after a failure."

"Lecturing again?" Hongyin's sweet voice came, and everyone was in a good mood during this time, and Hongyin's complexion was much better than before.

"Sister Hongyin, I'm asking Brother Jingtian a question, next time I'll ask you if you're okay?"

"Still don't, you have too many questions, I don't know how to answer them." Hongyin smiled and shook her head slightly. Everyone in the audience burst out laughing, and I also chatted with Hongyin about other topics without saying a word, and I was tired of being a teacher all the time.

We were talking happily, Hongyin suddenly looked startled, and waved her hands to signal everyone to be quiet.

"What's wrong!"

"There's a signal, the captain told me to go back to the cockpit right away!" After saying that, he turned around and hurriedly ran to the cockpit. The cabin fell silent all of a sudden, and my heart muscle contracted violently, and I tried to keep it less intense, but I failed.

In the cockpit, the captain stared at the display on the screen, which was currently a mess of garbled characters, which was encrypted. Hongyin quickly entered a series of instructions, and finally the garbled characters became readable information. I saw that it said: This is the galaxy spacecraft NC-46-86, receiving your rescue signal, I am now 0.16 light-years away from you, azimuth 46-78-15. Please press channel C-146 to send the authentication code.

"Captain, this ship is an Iceprism Star." Hongyin said as she watched.

The captain nodded, and ordered, "Send a verification code." ”

Hongyin quickly operated, and took out a key and stuck it on the console, and finally hit a key hard. A line of words popped up on the screen: the verification code was sent successfully, and it is expected to arrive in 23 minutes. The captain exhaled fiercely and said, "Wait! ”

46 minutes has never been very long, during this time everyone in the cabin stopped what they were doing, their eyes stared at the screen and refused to leave, the cabin was very quiet, only the captain's incessant pacing sounded from time to time. Time seems to have stopped, and people don't even move in the same position, only the eyelashes that flutter from time to time make people feel that time is passing.

Suddenly, another message popped up on the screen: I am Colonel Tetya, the captain of the NC-46-86 spacecraft, your identity has been verified, the spaceship has flown towards you, the speed is 10C, please wait in place, the spacecraft will arrive in 6 days.

"Oh!" "Oh!" The people cheered, and the stone in their hearts was finally put down, and anything could happen until it was finalized. The captain's tense face also relaxed, he sat on the chair, as if he had consumed a lot of his essence just now, touched his head with his right hand and said to Hongyin: "Inform the crew!" ”

We jumped for joy when we received the news, although we had to wait for six days, but it was nothing to us who had been waiting for seven years.

Six days later, a galaxy ship appeared in our field of vision on time, its familiar figure was extremely cheerful, and even its square shape made people feel so beautiful.

"How square this spaceship is, it's so ugly!" Wang Sihan said as he looked at the spaceship that was getting closer in the distance. This galaxy ship is the same type as the one I flew on my first expedition, and it is indeed a square cuboid in appearance, and there is no beauty in it. It seems that without explanation, this little guy is going to have some negative emotions about modern society.

Hongyin gave me a look, apparently asking me to explain. I smiled, I was still happy to explain some things to Wang Sihan, the little brother who was liked by the No.

"This is the galactic spaceship I've always told you, 988 meters long, with a standard square cross-section and 160 meters on each side. Its appearance is very different from that of a normal spaceship. Like the spacecraft we are riding now, it belongs to the space spaceship, it bears the needs of the ground and the sky, and its shape is to consider the aerodynamic effect, of course, it is mainly streamlined and combined with a rectangle. The starship will always stay in the vacuum environment of space, and there will be no air resistance, so it will naturally be more square. Of course, in order to save materials to the greatest extent, its cross-section is designed to be square, and you know why! "I deliberately didn't say that I wanted to test the little guy's math knowledge.

"Of course you know, the square area is the largest in the quadrilateral when the circumference is the same?" Wang Sihan looked at his clear eyes, "But from the perspective of saving materials, why isn't the spaceship designed as a cube, isn't that the most economical material?" ”

"Huh! Scold! Everyone couldn't help but be amused by Wang Sihan's words, and I am afraid that a strange ship with a cube appeared in everyone's minds. Theoretically, though, he was right, a cube is a three-dimensional figure with the least surface area of the same volume other than a sphere.

Luo Yuxiang patted Wang Sihan's head and said: "You are right, but you also need to consider the construction factors, the spacecraft construction generally adopts the segmentation method, this method first divides the nearly one-thousand-meter-long spacecraft into one or two hundred meters long sections, and finally closes them on the slipway after each section is completed, so that the construction is simple and convenient, and the speed is also fast." More importantly, the cuboid is conducive to the rational layout of the spacecraft's compartments. The cube is very troublesome to build, and the few cube aircraft are built using the tower method, which is inconvenient to construct and slow, and it is difficult to reasonably arrange the various functional compartments of the spacecraft. ”

Wang Sihan glanced at Lao Luo as if he didn't understand, and then looked at me and Hongyin.

"Do you think the nearly kilometer-long galaxy ship is too big or small?" Hongdan looked at Wang Sihan and asked with a smile, as if amused by some of his previous words, and asked him such a question to test him.

"It should be too big or too small." Wang Sihan replied quickly. Everybody, you look at me, and I look surprised when I look at you. The answer was not surprising, but the speed of his answer was also too fast, and he basically answered without even thinking about it.

"Why do you think so?" Hongyin asked.

"I don't know how long it should be, but Grandpa Kong often said that a house is good enough to live in, and it doesn't have to be big, and he also said that the size of all human products, whether they are buildings or other supplies, depends on functional needs, and it is impossible to build big for the sake of making big. The galaxyship should have undergone many refinements and designs, and its size should basically be the most reasonable. ”

"Whew!" Everyone looked at Wang Sihan in surprise, his logic was rigorous and reasonable, which was really surprising.

"Do you know what is the most in such a large ship?" Hongyin was unwilling, she just wanted to ask him.

"I don't know." Wang Sihan thought about it this time before answering. Seeing that Wang Sihan was finally stumped, Hongyin said happily: "Water, it can hold millions of square meters of water." ”

"That's a lot, it's not going to take up a lot of space!"

"Yes, this water is often used for other purposes than for domestic use. There is not much water in the universe, and there are two large compartments at the bottom of the middle section of the galaxy spacecraft, which are filled with water. I walked over and said to Wang Sihan, "If you are interested, I will find you some information about the spaceship to see, or find a school in the future to study this content." As for this unsightly ship, I'll just briefly introduce it, we're going to live on it for a long time, you have to like it. ”

Maybe I said that you have to live on it for a long time touched Wang Sihan, and he nodded desperately.

"This spacecraft mainly flies in three sections: front, middle and rear. The front is about 180 meters long, and it is divided into two parts, the upper part is the weapon compartment, and there are generally two large, two small and four dead light cannons. ”

"What a dead light cannon!"

"It's hard to say at once, it's a powerful weapon anyway. The lower compartment in the front section is the landing module of the small ship, and this is where our ship will be parked for the rest of the meeting. ”

"Why is it docked below, aren't ordinary ships parked on the deck?"

Wang Sihan has a lot of questions, but I can't help but explain. "There's no gravity in space, and it's so much easier to fly up than down! The rear compartment is the engine compartment, which is the representative of the highest technology in the universe - the superluminal engine, which is about 250 meters long. The intermediate cabin is the living cabin, the cockpit, the equipment cabin, etc. The living cabin is the largest cabin on board, measuring 300 meters long, 120 meters wide and up to 70 meters high. Astronautics sometimes take too long, and only the huge space of the living module can make people feel less depressed and feel at home. The feeling of home is so important during long voyages that it allows people to maintain a normal physical and mental state. ”

I continued to introduce some information about the spaceship, Wang Sihan listened very carefully, he expressed great interest, and from time to time asked some questions that we didn't think of, it seems that he really likes the spacecraft, maybe he will be an outstanding spaceship engineer in the future.