Deep Space Fleet

The construction of the "Earth Age" consumes 2.07% of the GDP of all mankind every year. After so many years, the total cost has reached 159 trillion federal currency!

This is an extremely huge number. After a long time, ordinary people are of course unwilling.

You know... many people on the earth are still eating dirt!

Li Cheng sighed again: "The Deep Space Foundation still needs to prepare at least trillions of funds to lay a light path for the 'Earth Age'."

"In the next 20 years, the Jupiter industrial base will at least collect a large amount of nuclear fuel, and its fusion energy will be used to launch long-range lasers..."

Zhang Yuan nodded, thoughtful in his heart.

The Earth Age adopts the dual propulsion mode of light sail and nuclear fusion propulsion.

Light sail refers to the push of light pressure. When a photon hits a smooth surface, it can change direction like a ping-pong ball bouncing off a wall and apply a corresponding force to the object that hit it, propelling the spacecraft.

However, the light compaction of sunlight is too small to quickly propel a giant spacecraft of tens of millions of tons. Only large artificial light sources from the moon and Jupiter bases can generate enough pressure to push it.

Think about it, although the nuclear fuel on Jupiter is inexhaustible, it still costs manpower.

In addition, this optical path needs to be launched continuously for 20 years, and there are hundreds of thousands of laser emitting devices, which must be replaced continuously. This is another huge sum of money.

It is hard to imagine how Professor Qi Yuanshan, the "father of nuclear fusion", persuaded those shrewd businessmen and wily politicians back then.

Deep space colonization, this super-large-scale project, has no benefits at all.

Even hundreds of years, thousands of years, it is impossible to produce any benefits.

This is very strange.

After chatting for a while, Li Cheng also felt that it was a bit boring to talk about these things with the younger generation: "Whether there is enough funds and budget is a problem that the bosses above should consider, and you don't need to worry about it. It's enough to do your own thing."

He shook his head, as if thinking of something, he stopped eating directly. He stood up from the dining table, walked into his study, and went to think about some problems on his own.

Although Zhang Yuan was very curious about the gossip in this regard, he had no choice but to give up after seeing this scene.

After the meal, Zhang Yuan complained privately: "Your dad and my dad are really similar, he is a workaholic. Suddenly something inspired, and then he got up and was busy recording. Don't disturb him at this time, Otherwise, it would be an angry meal, or something inexplicable."

"indeed!"

Li Zhendong agrees very much: "I remember when I was young, I asked my dad why 1+1=2. Do you know what he said? He even told me Peano's axiom. I was still in kindergarten at that time. No common sense!"

"Has your sister ever been educated like this?"

"have."

Li Zhendong exaggeratedly said: "Once, my sister asked him why the area of ​​a rectangle is the length multiplied by the width, and he directly talked about some incomprehensible things such as European space and inner product. Fortunately, my mother is a normal person. Otherwise, you will have to be brain-dead by him."

Zhang Yuan also laughed, and then recalled his father's weird style.

At that time, he was playing Rubik's Cube on the sofa, and his father suddenly had a whim, and he talked about group theory with a seven or eight-year-old child.

Yes, group theory, the paper Galvalo wrote in one night.

"It's just mathematics from 500 years ago. It's very simple. After you learn this, children will be impressed by you!"

Zhang Yuan was overjoyed: "I want to learn, I want to learn!"

"...The group formed by all operations is called Rubik's Cube group. Obviously, Rubik's Cube group is a non-Abelian group...If it can be decomposed into the product of simpler subgroups, and then construct the generator of each subgroup , you can prove its solvability. It has been proved that all Rubik's Cubes can be restored within 20 steps."

During this process, Zhang Qiming was elated and fully enjoyed the pleasure of being a teacher.

But in the end, he found his son, who seemed to be staring blankly at himself, unable to understand.

Can't understand?

Zhang Qiming uttered a foul word: "What a... idiot!"

I don't know if I'm talking about my son or myself.

Zhang Yuan sighed. Recalling these past events, he didn't have the same resistance at that time, but he was quite nostalgic.

It has been 3 years since my father passed away, right?

Time flies so fast, as soon as you open your eyes and close your eyes, 3 years have passed, the dead are gone, and all that is left is nostalgia.

Seeing that Zhang Yuan was not in a good mood, Li Zhendong turned on the TV and tuned to the children's channel, where a cartoon was playing - "Wolf Infested: The Ragnarok Turns into a Sheep".

"Don't look at me as a bear..."

It's a very childish cartoon, but the little girl next to me is very happy watching it.

Zhang Yuan asked again: "Aren't your parents distressed when you leave?"

"I don't feel bad, don't you still have a younger sister?" He pointed to a teenage girl next to him, and said heartlessly, "It's okay to have a few more in the future. Anyway, now that technology is advanced, you can give birth as you please. Affordable."

He continued: "Think about it, if I don't go on the spacecraft, I stay on the moon to work. I go home once a year during the Spring Festival, three days each time, and accompany them for two hours a day...In 60 years, the time spent with them is only 360. Hours……"

"Now, I stay at home every day, eat and drink, and accompany them for seven or eight hours a day, which adds up to more than two hundred hours a month. The whole vacation has spent most of my life with them. What regrets?"

Zhang Yuan scratched his head, what kind of bullshit logic is this?

However, it sounds like it makes sense...

Mother Li smiled and cut some fruit for them, she seemed to have gotten used to Li Zhendong's nervous remarks, "Zhang Yuan, don't go back today, stay at our house, there is still room anyway."

"Um."

Zhang Yuan nodded and sighed in his heart.

Li Zhendong's situation is very similar to his own, but the difference is that his parents are still alive and his family is happy.

Zhang Yuan, on the other hand, is the product of IVF, the sperm was provided by his father, and the egg came from an unknown female donor in the human gene pool. Up to now, he doesn't know who his blood mother is, and there is no need to know...

But who doesn't love having a kind and loving mother?

In college, the two had similar grades. However, Li Zhendong is a god of learning, playing around, and still scored more than 90 in the exam; while Zhang Yuan is just a top student, and he needs to put in more effort to get good grades.

This is actually a gap in intelligence...

But that's okay!

With that in mind, Zhang Yuan took out his phone and began to scan the "Super Brain" APP. A strange sense of happiness rose in my mind when I saw those mathematical symbols.

There is no need to envy others, learning makes me happy, and learning makes me grow!

As long as I can learn, I have the whole world!