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

    Li Zhendong is very angry, really angry. Every time he is surpassed by Zhang Yuan, he has to try again to surpass each other.

    Hard work is a very painful thing for him.

    In particular, this guy giggled happily while doing Junior High School Mathematical Olympiad problems. What''s this?

    Do Junior High School Mathematical Olympiad problems can also be done happily like immortals, is this a person?

    After grabbing a handful of hair, Li Zhendong was upset. The words in the book were like fleas. He jumped around and around. He didn''t know what he was talking about for a long time.

    I can''t calm down and don''t look at it.

    He glanced at Zhang Yuan''s topic again: "verification: 2 to the nth power are irrational numbers（ N is a positive integer greater than or equal to 2.) "

    "It is proved that assuming that 2 to the nth power is a rational number, it is counted as PQ, and P and Q are prime numbers."

    "Then 2 = (P ^ n) (Q ^ n), that is, 2 (Q ^ n) = (P ^ n)"

    "Move item to get p ^ n = q ^ n + Q ^ n."

    "According to Fermat''s law, there is no positive integer solution to the equation. Therefore, the assumption is wrong. 2 to the nth power is an irrational number. "

    Li Zhendong almost vomited an old mouthful of blood: "you can''t teach my sister like this, really! And you''re helping her with her Mathematical Olympiad. How can this work? "

    Zhang Yuan was stunned and found that he seemed to become a free homework thug unconsciously.

    But never mind. As like as two peas, if you copy it exactly, the teacher will laugh at it.

    "Forget it, I won''t do it either. It''s enough for recreation here. " Zhang Yuan yawned and felt very happy.

    Li Zhendong finally breathed a sigh of relief. He couldn''t wait to put down his books and rubbed his sore temples.

    He picked up the telescope, walked out of the balcony and looked in a direction of deep space.

    Gliese 581, one in Libra β Stars to North 2 degrees of red dwarfs, their destination.

    Its mass is 0.31 solar masses, its radius is 0.38 solar radii, and its surface temperature is about 3480k (3206.85 ℃).

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

    That''s the future home star!

    Li Zhendong had a whim: "you said, why is there a deep space plan? Is it because human beings have learned that aliens will attack the earth? "

    "Impossible!"

    Zhang Yuan responded faintly: "if this is the case, it is absolutely a collection of global forces to build spaceships on a large scale. And get us to run away? You should have seen all kinds of science fiction movies. When the end comes, how much is the ticket to Noah''s Ark? Even if we are the sons of scientists, it doesn''t have to be that important? "

    "Although the film is not true, it is also part of the true portrayal. Now no national leader is in a hurry to run away. When was mankind so noble? "

    There was silence for a while.

    500000 volunteers are not the best people in the earth civilization. Everything depends on personal volunteers. There are a few scientific giants with dreams, but real political giants can''t give up everything on the earth and go to such poor places.

    Li Zhendong smiled: "yes, so no aliens attack the earth. What do you say is the reason? "

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

    In the direction of Zhang Yuan''s finger, there is a star, kic-8462852, commonly known as tabby star.

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

    Look up at the sky.

    The moon is bright and the stars are rare. The lights in big cities cover the bright starry sky above. It becomes more difficult to find these stars.

    In 1977, there was a blackout in North America.

    In the night when the lights disappeared, the boundless sky showed its original appearance.

    A funny scene happened. That night, the police station received many alarm calls, saying that "aliens attacked the earth!"

    The reason is... This group of urbanites have never seen the real galaxy. They are overwhelmed by the ancient power.

    Yes, the earth mother is really too warm, too gentle, gentle. Human beings in that era are reluctant to leave their swaddling clothes and have gradually forgotten the vast world outside.

    But

    The world is not just human.

    The universe will not disappear directly because of human deception.

    The first challenge comes from the "ship base" η Star, also known as seamount II, is a super giant, which has more than 100 times the mass of the sun. Scientists estimate that the star may explode within a million years to form a supernova!

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

    If the ship base η Star, 7500 light-years away from the solar system is good news, so another news is fatal

    After research, its rotation axis may have been aligned with the solar system, which is like a stellar cannon ready to launch!

    At the base of the ship η When a star explodes, a powerful gamma ray burst will sweep the entire solar system.

    "Unfortunately, this bright star cannot be seen in the northern hemisphere."

    Of course, this disaster may be large or small. Firstly, the time node of its outbreak is too vague. It may have erupted a million years later, tomorrow, or even a hundred years ago.

    What''s more, scientists are still working on the base of the ship η The deflection of the star''s rotation axis and disaster prevention are debated

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

    After a long journey, gamma ray bursts may destroy the whole ecosystem, but they may not have much impact. I don''t know.

    The second challenge comes from kic8462852, tabby star.

    In the 21st century, human beings have found this strange star, and its periodic light change has attracted extensive attention of astronomers.

    At that time, many scientists speculated that nebulae or other large objects covered the star and caused its light change.

    But!

    Hundreds of years of observations have only proved one thing: its shading is increasing at the rate of 0.64 per thousand every ten years.

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

    What does it mean?

    It means that there is an artificial building near the star, and it is being built at a uniform speed.

    It''s been going on for hundreds of years!

    Dyson ball, it''s right there. There will be no change because of human will.

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

    The distance of 1400 light-years is too far for human beings, but it is far from enough to smooth out this panic.

    Any normal person knows what "Dyson ball" means.

    Compared with the civilization that can build Dyson ball, human civilization 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, human beings will be destroyed by their own laziness!"

    "... just as in the old times, the upcoming trend of entertainment, non-toxic and neurotoxic drugs are bound to destroy most of mankind''s enterprising spirit. Dyson ball has been proved to be true, and mankind may be able to recover from the rotten consumerism and capitalism, similar to the effect 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... It''s wonderful!"