In the dead of night, two young people were frantically brushing up on questions.

Li Zhendong was very angry, really angry, every time he was surpassed by Zhang Yuan, he had to work hard again to surpass the other party.

Hard work is a very painful thing for him.

In particular, this guy is smirking happily while doing junior high school math Olympiad questions, what is this?

Can you still be happy like a fairy when you do junior high school math Olympiad questions, is this a human being?

Grabbing a handful of hair, Li Zhendong was irritable, and the various words in the book were like fleas, jumping east and west, and he didn't know what he was talking about after reading it for a long time.

I couldn't calm down and didn't look at it.

Glancing at Zhang Yuan's title again: "Verification: 2 to the nth power are irrational numbers." (n is a positive integer greater than or equal to 2.) ）”

"Prov: Suppose 2 to the nth power is a rational number, which is counted as p/q, and p and q are prime numbers of each other."

"Then 2=(p^n)/(q^n), i.e. 2(q^n)=(p^n)"

"Move the term to get p^n=q^n+ q^n."

"From Fermat's law, there is no positive integer solution to this equation. Therefore, the assumption is wrong, and 2 to the nth power are irrational numbers. ”

Li Zhendong almost spit out a mouthful of old blood: "You can't teach my sister like this, you really can't!" And you're helping her with the math Olympiad, how can this work? ”

Zhang Yuan was stunned, and found that he seemed to have unknowingly become a thug who did homework for free.

But it doesn't matter, the whole proof idea is ...... If you copy it exactly the same, the teacher will definitely laugh crazy.

"Forget it, I'm not going to do it either. It's enough to entertain here. Zhang Yuan yawned, feeling quite happy.

Li Zhendong finally breathed a sigh of relief, couldn't wait to put down the book in his hand, and rubbed his sore temples.

He picked up his binoculars, stepped out of the balcony, and looked in one direction into deep space.

Gliese 581, a red dwarf located about 2 degrees north of β Libra, their destination.

It has a mass of 0.31 solar masses, a radius of 0.38 solar radius, and a surface temperature of about 3,480 K (3206.85 °C).

The +10.56 apparent star means that ordinary astronomical telescopes can't see there, but Li Zhendong is still searching tirelessly.

That's the future home planet!

Li Zhendong suddenly thought: "You say, why is there a deep space plan?" Could it be that the human hierarchy has learned that aliens will come to attack Earth? ”

"Impossible!"

Zhang Yuan responded lightly: "If this is really the case, it is definitely a large-scale construction of spaceships by gathering global forces." And it's our turn to get the people of us to escape? You should have seen all kinds of science fiction movies, the end of the world is coming, how much does a ticket for Noah's Ark cost? Even if we are sons of scientists, it doesn't necessarily matter that much, does it? ”

"The movie is not real, but it is also a portrayal of the real part. Now that no national leader is in a hurry to run away, when has humanity become so noble? ”

There was silence for a while.

The 500,000 volunteers are not the best people in the earth's civilization, and everything depends on individual volunteers. There are a few scientific giants with dreams, but it is impossible for a real political giant to give up everything on earth and go to such a poor place.

Li Zhendong smiled: "Yes, so there are no aliens attacking the earth." So what do you say is the reason? ”

Zhang Yuan pointed to the two directions of the sky, frowned, and said, "It could be that, or it could be this...... Or both, or more importantly, we don't know why......"

In the direction that Zhang Yuan pointed to, there was a star, KIC-8462852, commonly known as Tabi Star.

The one in the other direction is the η star of the ship base.

Look up at the sky.

The moon is sparse, and the lights in the big city obscure the bright starry sky overhead, making it even more difficult to spot these stars.

Historically, in 1977, there was a power outage in North America.

On that night, when the lights faded, the infinite sky revealed its original appearance.

In a ridiculous scene, that night, the police station received many calls from the police, saying "Aliens are attacking Earth!" ”

The reason is none other than ...... This group of urbanites had never seen the real galaxy, and they were overwhelmed by the power of the eternal desolation.

Yes, Mother Earth is too warm, too gentle, so gentle that the human beings of that era are reluctant to leave the swaddling clothes, and have gradually forgotten the vast world outside.

But......

The world is not just about human beings.

The universe will not disappear because of human beings.

The first challenge comes from the "η star of the constellation of the Boats", also known as Seamount II, an extremely supergiant star with more than 100 times the mass of the Sun. Scientists estimate that the star could explode in a million years to form a supernova!

Note that it is a polar supernova, which has one more word "polar" than an ordinary supernova.

If the constellation η planet, 7,500 light-years from the solar system, is good news, the other news is simply deadly......

After research, it is likely that its axis of rotation is already aimed at the solar system, which is tantamount to a stellar cannon ready to fire at any time!

When the star η the constellation explodes, a powerful gamma-ray burst will sweep across the entire solar system.

"It's a pity that this bright star is not visible in the Northern Hemisphere."

Of course, this catastrophe may be big or small, first of all, the timing of its outbreak is too vague, it may be millions of years later, or it may be tomorrow, or even a hundred years ago.

What's more, scientists still debate the degree of deflection of the axis of rotation of the star η Constellation and disaster prevention......

Human beings do not know much about this celestial body, and it is difficult to accurately predict the disasters it will bring to human civilization.

After a long journey, a gamma-ray burst could destroy the entire ecosystem, but it may not have much impact. I don't know anyway.

The second challenge comes from KIC 8462852, Tabi Star.

In the 21st century, humans have discovered this strange star, and its periodic light changes have attracted the attention of astronomers.

At the time, many scientists speculated that nebulae or other large objects were obscuring the star and causing its light to change.

But!

Hundreds of years of observations have proved only one thing: its shading is increasing at a rate of 0.64 thousandths per decade.

In other words, if the maximum shading figure ten years ago was 22.112% shading, it is now 22.176%, without exception.

What does it mean?

It means that there is a man-made structure near the star, and it is being built at a constant pace.

It's been going on for hundreds of years!

Dyson sphere, it's there. There will be no change in human will.

This fact caused a great panic at the top of civilization.

The distance of 1,400 light years is too far for humanity to quell this panic.

Any normal person knows what "Dyson Sphere" means.

Human civilization, compared to the civilization that can build Dyson spheres, is simply a paramecium!

At that time, Professor Qi Yuanshan, the "father of nuclear fusion", wrote excitedly in his diary: "If there are no aliens, mankind will be destroyed by its own laziness!" ”

“…… Just like in the old days, the imminent wave of entertainment, non-toxic neuropharmaceuticals is bound to destroy much of humanity's enterprising spirit. The Dyson sphere has been proven to be true, and humanity may be able to bounce back from erosive consumerism and capitalism, similar to the effects of the Cold War between the United States and the Soviet Union! ”

"I have to say that mankind has a good neighbor, and maybe there is hope, fortunately...... Absolutely! ”