Xu Jiawei was thinking about going to space in the office, and his younger brother Jiaxuan told him to go home for dinner.

"No, Jia Xuan, you told your mother that I'm very busy now and can't come back. He said to his brother on the big screen on the wall.

"Brother, what are you writing? Xu Jiaxuan saw the handwritten materials on Jia Wei's desk.

"The traditional is the best, how can you throw away the things left by the ancestors, you see how beautifully my father's handwriting is. ”

"Yes, there aren't many people who can write like Dad and write so beautifully, but if you try harder, you'll be able to keep up with Daddy, but it's not very likely that you will surpass Daddy. ”

The two brothers chatted for a while, and Xu Jiawei said, "Is there anything else? If you tell your mother about this, I am very busy now and can't come back, so I will come back as soon as I am free." ”

Jia Xuan was anxious and said: "Brother, don't hang up, there is one more important sentence, you must go home at night, there is an important guest coming, people are coming for you, you will be embarrassed if you are not there." ”

"Then let him come to my unit. Xu Jiawei thought, he was still busy preparing to go to outer space, who would have to come to see him at this moment, I am not a celebrity, and I can't help anyone else.

"Go to your unit? Don't be funny, your unit will let you in? Last time, my father had to go through several approval procedures when he entered your unit for official business. ”

"Well, what kind of guest do I have to see a useless person like me? You can just reply to me, saying that I am too busy to go back. ”

"Brother, you also know that Dad is a traditional Confucian student, very particular about etiquette, since people have come to the door, it is rude for you not to come back, Dad will not allow it, you can weigh it yourself if you don't come back, haha. After his younger brother Xu Jiaxuan finished speaking, he hung up.

Xu Jiawei was a little annoyed in his heart, he was preparing intensively for the expedition to outer space, how could he be distracted at this time, if he was selected in the country or globally in the future, he would definitely be brushed down if he did not have a strong knowledge strength, which would be his lifelong regret. Who is in such a hurry to see me at this juncture!

Due to the interference of his train of thought, Xu Jiawei couldn't calm down anymore, he thought that instead of sitting here and working ineffectively, it would be better to go home early, anyway, he turned off the office system and went to the laboratory to say hello to Lin Shanshan.

"Shanshan. Xu Jiawei said, "Oh, it's hard work." He saw that Lin Shanshan was also studying the professor's information.

"Xu Jiawei, you came just in time, look at it, look here. Lin Shanshan pointed out to Xu Jiawei.

"Taizhou Bay Black Hole?" This black hole was discovered 200 years ago by a scientist from Taizhou, China, and named after the place name of his hometown.

"Yes. You see that there is a large vacuum on its side, which means that all the matter here is attracted to it, its gravitational force is unimaginably large, if our spacecraft can grasp it well, keep a certain distance, and make good use of its gravitational force, it is a very good acceleration. ”

"I couldn't agree more. The Taizhou Bay black hole is located on the outer side of the Milky Way, about 10,000 light-years from the edge of the Milky Way, and is located exactly to the east, which is the first black hole after we left the Milky Way in this path. You've studied it very carefully, I've only seen the stellar part, the black hole hasn't seen yet, you're ahead of me. ”

"How's the gravitational pull of the stars studied?"

"The gravitational pull of stars can only be used if it is many times greater than 100 times light-years, otherwise it is meaningless, not all stars can meet the requirements, I am sifting, but I still hope to work on black holes, the gravitational pull of stars is definitely not as big as black holes, but there are not so many black holes to use. ”

"The risk of a black hole is also huge, and it's hard to be buried in a black hole forever, haha. Although Lin Shanshan said this, she didn't care in her heart.

"I still believe that there is a gravitational source in the universe, and I hope that I can catch it this time, so that the time can be greatly shortened. ”

"I'd also like to run into the wormhole you mentioned, so it will be shorter. Lin Shanshan said.

"I'm optimistic about that. Xu Jiawei said with a smile.

"I saw that Ma Biao and Chen Jie were also immersed in research, and it would be great if the four of us could be selected together this time. ”

"Impossible, the professor won't let the four of us out, I'm determined to go, Ma Biao is also an ironclad thing, Chen Jie, I can't see his wishes, as for you, I'll look at three words--" Xu Jiawei said.

"How?"

"No way. Xu Jiawei laughed and left, "By the way, I have something at home, so I retired early." ”

"Hmph, don't be complacent, it's impossible for a team to be without women, and I'm going to make a decision this time. Lin Shanshan said.

Xu Jiawei returned home, and his mother was very happy and asked Jiawei to go and change his clothes. Jia Wei said: "When I go back to my home, I have to change my clothes, and I don't go out. ”

"The evening is different, there are especially important guests to meet, listen to the mother. His mother urged him to change his clothes.

"Where's my dad?"

"He's in the study. Oh, you go change your clothes, leave your dad alone, the guests will be here in a moment. ”

"What kind of guests are so grand, and they have to change their clothes to greet each other. Xu Jiawei said with a smile.

Xu Jiawei didn't go to change clothes, but wanted to go to the study to visit his father first. Dad is the idol in his heart, when he was a child, he felt that his father knew everything, he was an omniscient person, especially about heavenly things, what he asked and what he answered, and even if he hadn't asked yet, his father who was thinking in his heart could blurt out. When he grew up, he felt more precious to his father, and he had knowledge in his heart, and he did not reserve about his students, and he educated them very carefully, and later his astronomical knowledge surpassed his father, and his father learned from him in turn, and taught the students what he had learned, and some of his students had already served in key positions in astronomical research institutions. It may be Dad's students who come at night, asking for advice from himself, and Dad has always refused to come to those who are humble in their studies, it must be like this.

"Dad. Xu Jiawei saw his father looking at the book seriously and exclaimed softly.

"You're back. Dad put down the book.

"It's your students visiting in the evening, right?"

"Oh yes, yes, I used to be my student, and now I'm a middle school teacher, but not at my father's school. Dad took a sip of tea.

"Dad, the water is cold, re-brew or refill the water?" Xu Jiawei saw that his father's teacup was almost empty, and his father was very involved in reading the book, and he didn't know if the water ran out.

"Refill the water. Dad handed him the teacup.

Xu Jiawei was very proud that his judgment was correct, and said: "Dad, why do you need me to change clothes when your students come to visit, our family doesn't seem to have such etiquette." Xu Jiawei put the cup next to his father.

"Oh, yes, I don't know who told you to change your clothes. ”

"That's Mom's own opinion, and Dad doesn't know that people who pay attention to etiquette don't know. Then I don't have to change it. Xu Jiawei simply sat down after speaking.

"It's very busy in the unit now, and I don't go home. Dad reproached a little.

"Yes, Dad, very busy. It will surprise you to say it. Xu Jiawei specially sold a pass.

"Oh, what's the matter?" Dad was interested.

"You teach astronomy and geography, and you say, will there be prehistoric humans before our generation?"

"Theoretically, there are, and there are many unsolved mysteries on Earth, which cannot be ruled out as prehistoric man, but no direct evidence can be found in reality. ”

"I found it for you. ”

"Where was it unearthed, is there any evidence?" Dad became more and more interested.

"15 billion light-years away. Ha ha. Xu Jiawei said with a smile.

"You kid. "The father thought his son was telling a joke and didn't think so.

"Really, Dad, the lab has received a message from 15 billion light-years away, confirming that it was an emissary sent by the previous generation of humans, of course, maybe the previous generation of humans, who are now trapped in the spaceship and can't come back. ”

"Really?" Dad was surprised and couldn't keep his mouth shut, "Go on." ”

"Really, you think, to be able to fly 15 billion light-years away, isn't it prehistoric humans? ”

"Verify and don't be deceived. Dad said, "It's so far away, even the speed of light is 15 billion years, and the earth hasn't been born at that time, how can there be people over there?" ”

"After verifying, the question now is how to get them back. ”

"No, it's not unnecessary, it's impossible, the fastest speed is only 10 times the speed of light, it is said that 100 times the speed of light will be put into use, even if it is 100 times the speed of light, it will take 300 million years to go back and forth, will the earth still exist in 300 million years? We can only say that love can not help, looking at the sky and sighing. Dad said.

"Now it's decided to pick it up, it's just a matter of how to pick it up, and I plan to use global forces to rescue it. ”

"From a humanitarian point of view, I am also in favor of rescuing, but I can't save it, even if everything goes well, it will take 300 million years, not to mention such a distant space, there is too much uncertainty to rescue. ”

"We can't just watch our peers never go home. ”

"Jia Wei, you are right, but there is no way to rescue, if there is a way to rescue me, I will be the first to go, such a living person we can't see that they have no home to return to, trapped in the vast space. ”

Xu Jiawei was so kind and seductive, and guided his father to his side. "Dad, you are a Confucian student, your courage is commendable, and you are very worthy of your predecessors if you have this heart. ”

"If you can go back in your lifetime, it is not negotiable, and you must save the greatest risk, but it is a long 300 million years, and it is really helpless. Dad sighed.

"That means it's just a matter of time, if time permits, Dad will not only agree to save it, but will also go up to save it himself?"

"If it could be my turn, I wouldn't hesitate. Alas, it's a pity that I have no ambitions. ”

"Dad is willing to go, so if I want to go, Dad will definitely not object. Xu Jiawei slowly got to the point.

"Why am I against it, saving people is what it should be. ”

"Hehe, Dad, with your words, my heart is steady. ”

"What?" the father looked at his son with wide eyes.