No one can confirm the existence of parallel universes, and for something that cannot be verified or falsified, as long as you believe that it exists, then it exists - so maybe there will be such a universe, the earth is safe and sound, and Tang Yue and Mai Dong can live a peaceful and joyful life.

That's what the old cat said.

It also said: If the number of parallel universes is really infinite, then Tang Yue and Mai Dong will meet more than once, they will meet every Planck time in the entire timeline.

"So...... Will they have children? Mai Dong asked in a low voice.

"If you're having normal fertility, then obviously you'll have offspring."

"It's not us ......" Mai Dong corrected, trying her best to keep her tone steady, anyway, she was blushing and steaming on the space station, and no one could see it, "It's them." ”

"They are you." The old cat corrected back.

"That'...... How many children will they have? ”

"How many children do you wish you had?" The old cat asked.

"It's them, they're them, it's not me." Mai Dong took off his mask and buried his face in his spacesuit, his cheeks feverish in the cold air.

The old cat is inexplicable.

Wheat Dong in the parallel universe is not Wheat Dong?

"Well, how many children do you want to have? Miss Mai Dong, as a representative, please answer this question. The old cat changed his words and asked, the Mai Dong here refers to the Mai Dong in all parallel worlds.

"Two, a boy and a girl." Mai Dong replied, "It's better to be a brother and sister, so that the elder brother can protect the younger sister, and the younger brother can actually do it...... But in this way, the older sister will bully the younger brother. ”

Tang Yue sat on the side and sneered.

It's naïve.

Obviously, Mai Dong has no brother.

Who told you that your brother will definitely protect your sister?

Like him Tang Yue, he never covered his sister.

It's always been his sister who covers him.

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"Forty ...... Forty...... Forty. ”

The old cat muttered behind the monitor.

"What forty?" Tang Yue raised his head and asked.

"Forty for the small hammer, eighty for the big hammer." The old cat leaned his paws on the computer monitor and hooked his fingers, "Tang Yue, I sent you the constructed equation of motion, you can calculate it, use pen and paper." ”

Tang Yue was startled by the dense array of letters and operators on the screen.

"Why don't you just let the workstation count?" Tang Yue asked, while taking out a large stack of scratch paper from the drawer, "Just tap the keyboard." ”

"Because I can't believe it." The old cat worked at the desk, "This workstation has been going wrong a lot lately, and it keeps giving me wrong results, which is even more stupid than you." ”

"I didn't hear the last sentence, I need to use a pen and paper to ......calculate such a complicated thing," Tang Yue opened the lid of the pen and scanned the formula on the screen up and down, "If you want my life, just take a fruit knife and stab me." ”

"Oppenheimer also used pen and paper to calculate the critical mass of uranium fuel."

"That's Oppenheimer!"

"But you stand on the shoulders of giants."

"Just because I'm standing on the shoulders of giants doesn't mean I'm taller than giants." Tang Yue copied the formula on the screen on scratch paper and began to calculate it step by step, although the formula was complicated, it was not a matter of testing IQ, it was just a continuous matrix deformation, no more than the course content of college mathematics, pure pen and stick kung fu.

"Speaking of this, I suddenly remembered an old Soviet joke, about a rule in hell, whoever kills innocents indiscriminately in the world, then in hell the blood of the victim will drown this person, one day God inspected hell and found that the blood only reached Beria's legs, God was very strange, so he asked him that you had a lot of blood debts in your life, why did the blood only reach your legs? Beria replied: Because ......"

"Equations of Motion for Attitude." The old cat sent the new equation and glanced at him, "Note that q is a vector of gesture quaternions." ”

"Three Euler axis directions, the last Euler corner, right? Clear. Tang Yue nodded, "Let's go on with that joke, God is very strange, so he asked Beria, you have a lot of blood, why did the blood only drown your legs?" Beria replied: ......"

"There are two simulation results here, the first ignoring the effects of flexible solar panels on the spacecraft, and the second considering the effects." The old cat sent another large number of terrifying numbers and charts.

"What are you giving me this?"

Tang Yue glared.

"Check to see if there's any problem."

"The problem is that I don't understand, man, do you think I'm Ramanujan...... Can you become a master by self-study? Tang Yue flipped through the page, frowned, and then buried his head in the calculation, "Let's continue with the joke, Beria replied: Because ......"

"Because I stand on Stalin's shoulders." The old cat shook his head, "This old political joke is as old as your grandfather's. ”

Tang Yue was stunned, "What?" Standing on Stalin's shoulders? ”

The old cat was also stunned, "Isn't it?" ”

"No, it's not." Tang Yue shook his head, "Beria replied: Because you didn't add anticoagulants to your blood - so he stood on the clotted blood cells, and God only saw the upper layer of serum - this is what our middle school biology teacher said, and he was taking a class on blood and serum at the time. ”

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"Listen, this is a strategy, the method and control steps of rendezvous and docking of non-cooperative targets, we all know that the joint space station is completely uncontrolled at the moment, and docking in this situation is undoubtedly extremely difficult." The old cat sat on the edge of the table with his elbow on the monitor, "So we need to set up a docking point at a suitable distance, so that the Tianzhou spacecraft can observe and analyze the space station at this distance." ”

"How far apart do you want to keep?" Tang Yue's pen walked the dragon and snake, brushing and calculating.

"I don't know, I'm still calculating." The old cat shook his head, "Is Miss Mai Dong here?" ”

"She's in the no-signal zone."

"The Tianzhou cargo spacecraft is an unmanned spacecraft, and the most important thing is to let an unmanned spacecraft dock with an uncontrolled spacecraft, and the most important thing is to adapt, and there is a delay in our remote control interference, which is definitely too late." The old cat continued, "The whole plan is to be divided into three main parts...... The first is the analysis and judgment of relative motion, which is the premise of rendezvous, and the Tianzhou spacecraft must accurately analyze the attitude, orbit and motion state of the joint space station, and make predictions. ”

"Can it do it?"

"I can't do it." The old cat replied, "So let's take care of this, including the landing site, we have to make the landing site of the spacecraft as close to Kunlun Station as possible, but once the spacecraft really enters the atmosphere, the landing site cannot make major changes, so this has to be measured in advance." ”

"It's too complicated." Tang Yue put down the pen in his hand, was silent for a moment, and finally said.

Even a layman like Tang Yue can appreciate the complexity of this plan.

"It's complicated and not scary." "No matter how complicated and confusing the dead knots are, they are strung together by simple ropes, and if you get the right direction, the problem will be solved—and this is the simplest of the three." ”

"What about the second part?"

"The second part is automatic control." The old cat said, "You are studying mechanical and electrical, you know what the fundamental principle of automatic control is, negative feedback - the Tianzhou spacecraft must adapt to the attitude and movement state of the joint space station by itself, self-adaptation is the key to everything, according to the microwave radar and docking sensor data to adjust their own state, repeated deviation correction, which requires extremely high precision, extremely high precision, extremely high precision." ”

The old cat shared six extremely high emphasis on the harshness of the conditions.

"Can it do it?"

"I can't do it." The old cat replied, "So it's up to us to take care of this, ladies and gentlemen, let the workstation play with a big ticket, dismantle the case, prepare enough ice to cool down, even if it hangs up after this, it will be a dead death." ”

"The third part is rendezvous and docking, or capture." "If the first two steps go well, then in the final stage, the Tianzhou spacecraft will capture the United Space Station, dock with the latter, take Miss Mai Dong out, and then quickly break away, adjust the attitude and re-enter the atmosphere - the whole process will be controlled by the computer, it must be clean and neat, in one go, there can be no delay, a little delay is two ships and one life." ”

"Can it do it?"

"It has to be done."

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(Author's gossip: Even Sister Zhiling is married, Baiyun Canggou.) ）