It's just one night's time, and it's obviously impossible to see all the stars in the night sky.

Nofi was still young, and her routine was to go to bed before 10 p.m.

Shen Qi's father and daughter returned to the staff dormitory of the Kedu Town Academy of Sciences, and the father and daughter ate supper together and slept together.

Lying in bed, Nofi had insomnia, she tossed and turned and couldn't sleep.

"Daddy, sing. ”

"Okay, let Dad brew the feelings first. ”

When he was at home, the responsibility of singing to lull Nofi to sleep was borne by Shen Qi, because Ou Ye's singing voice was not good.

On a trip to other places, only Shen Qi accompanied Nofi, of course, Shen Qi continued to take on the task of singing and coaxing the baby.

Coming here with his daughter to see the stars, and discussing the mysteries of the universe by the way, Shen Qi thought of a song that was appropriate for the occasion, so he sang with his singing voice:

"When the sun doesn't rise anymore. ”

"When the earth doesn't turn anymore. ”

"When spring, summer, autumn and winter no longer change. ”

"When all the flowers and trees wither. ”

"I still can't break up with you. ”

"I take the earth with me. ”

......

The song is an old song, and when "Huanzhu Gege" was on the air, Shen Qi just came out of his mother's belly.

A few years later, there was a domestic sci-fi film that was a hot seller, about the sun was about to explode, and human beings fled the solar system with the earth.

Power trains are really talented, they predicted the apocalyptic scene of the sun exploding and the earth wandering in the 90s of the 20th century, and composed the popular hit song "When".

Listening to this old song, Shen Nuofei fell into a sweet dreamland......

......

It's dawn.

The sun rises as usual.

The town of Kedu in May is sunny and fragrant with birds and flowers.

The earth is an incomparably beautiful home, and it is difficult to find a planet in the universe that is as suitable for human habitation as the earth. At least not found for now.

If they can live and work in peace and contentment, who wants to leave their homeland and wander?

Escaping the solar system is much more difficult than escaping from Beijing, Shanghai and Guangzhou.

Shen Qi's father looked at his daughter who had not yet woken up with love, what a cute little girl, for the sake of future generations, we should protect the earth's environment, gold and silver mountains are not as good as green waters and green mountains.

The solar helium flash is a natural disaster, if it really comes to that day, then there is nothing to say, human beings either accept their fate or get out.

But human beings themselves have caused a terrible scourge on the earth, and that is self-inflicted.

Shen Qi walked off the bed lightly, brushed his teeth, washed his face, made coffee, and prepared Nofi's breakfast.

After a while, Nofi slept until she woke up naturally, and a new day had arrived.

The father and daughter had breakfast and enjoyed themselves.

At about nine o'clock, someone called Shen Qi, an astrophysicist from the Academy of Sciences who was stationed in Tianyan, China.

The other party said politely and self-reproachfully on the phone: "Academician Shen, I took the liberty to interrupt, I know that you are on vacation with your daughter, although it is very presumptuous, I still called you." ”

"Professor Qu, if you say that, you'll see the outside, say, what do you need me to do?"

"What are Academician Shen's arrangements today?"

"I walk around the town with my daughter during the day and watch the stars with my daughter at night. I'm free during the day, but I have a request, I'll take my daughter with me wherever we go. ”

"That's good, then good, why don't you bring your daughter to our office to sit?"

"Okay, I'll see you later. ”

Ending the call, Shen Qi guessed probably, Professor Qu and their astrophysics team were afraid that they had encountered some academic problems, right?

If you have a problem to find an expert, Shen Qi has obtained two promises, who is Professor Qu looking for if Professor Qu doesn't look for Shen Qi?

With Nofi, Shen Qi came to the "Research Center of the Astrophysics Research Group of the Department of Mathematical Physics of the Academy of Sciences in Kedu Town".

The astrophysics research team with Professor Qu as the core warmly received Shen Qi's father and daughter.

"This is Nofi, right? Hello Nofi. Professor Qu greeted Shen Nuofei with a smile on his face, and Shen Nuofei was the youngest guest their research group had ever received at the Kedu Town Research Center.

"Hello grandpa. "Nofi is very polite, and her parents are very good at training.

"Grandpa?" Professor Qu smiled dumbly, and his negative emotions skyrocketed.

Touching his bare head, Professor Qu squatted down, his eyes at the same level as Nofi: "Nofi's niece, Uncle Qu, I am only 8 years older than your father, I am only 39 years old this year, and your father is a generation, both of whom are born in the 90s." If you call me grandpa, won't I take advantage of your father?"

"Hmm......" Nofi looked at Professor Qu and then at Dad.

What does the post-90s mean?

If you and my dad are both born in the 90s, why is my dad so young and you so old?

After thinking about it, Nofi finally figured it out, and she shouted sweetly: "Uncle Qu is good." ”

"Nofi's niece is awesome!" Professor Qu, who has no children, likes Nofi, a smart, lively and cute little girl.

After teasing the little girl, Professor Qu got straight to the point: "Academician Shen, on behalf of our team, I would like to report to you the results of our recent work and the difficulties encountered in our work. ”

Sure enough, Professor Qu and the others did encounter a problem.

Shen Qi is an academician of the Department of Mathematical Physics of the Academy of Sciences, and the research team of this department has made an academic request, and Shen Qi should lend a hand.

Shen Qi sat on the big chair and said, "Let's study together." ”

Shen Nuofei sat on the small bench next to her father with a serious appearance, just like Shen Qi's little secretary.

Professor Qu handed Shen Qi a tablet: "Our colleagues from the Astrophysics Research Group and the National Astronomical Observatories have been working here for a long time, and our main task is to find new pulsars through FAST. So far, we have achieved our goal of finding pulsars, accumulating a certain amount of sample data for our 'lighthouse system'. ”

Pulsars are high-speed rotating neutron stars, produced by stellar evolution and supernova explosions, and their density is extremely high, weighing hundreds of millions of tons per cubic centimeter, and a piece of pulsar material the size of a sugar cube is equivalent to the weight of 10,000 tons of giant ships on Earth.

The rotation period of pulsars is extremely stable, and its stability is more than 10,000 times higher than that of hydrogen atomic clocks, which is equivalent to a stable astronomical clock in the universe. Accurate clock signals are a necessary prerequisite for spacecraft navigation, and one of the significance of pulsars for human beings is to serve as a beacon for human interstellar navigation, guiding human beings to identify the direction in interstellar travel.

The farthest human astronauts have ever traveled is the Moon, and human scientists have begun to build navigation systems thousands of light-years away.

Shen Qi fully affirmed the efforts and achievements made by the Astrophysics Research Group of the Academy of Sciences and the National Astronomical Observatories in the field of "lighthouse system" research, and asked: "Then Professor Qu, what is the problem you are encountering?"

.。 m.