Just after Christmas 2135, Santa Claus in a sleigh pulled by nine reindeer may have not flown back to Greenland, and UNESCO and the United Nations Environment Programme (UNEP) could not wait to convene the first joint global meeting of scientists marked 2136. More than 1,000 scholars from around the world who have mastered the most cutting-edge science and technology gathered for three days of intense discussions.

Fifty years later, the conference was known to the scientific community as the "Doomsday Conference", and the date of its start was also set as the starting date for the end of the earth. The name was terrible, but the results were quite effective, and many scientists who attended the meeting finally agreed that the cause of the sudden change in the Sun's internal activity came from the outside of the Sun: in the very center of the solar system, that is, perpendicular to the Sun, there was a collapsed space 7 light-years away from it, and the remains of a "dark galaxy" hidden in the space were not discovered by humans until today.

Astrophysicists prefer to call the mysterious and terrifying killer "Lone Galaxy" because, by the time of the Doomsday Conference, only one dead star had been found in that galaxy (if it would be more figurative to call it by its name). In the usual sense, galaxies are made up of a large number of stars and planets that orbit them, and many of them have their own moons, such as the Earth's moon moon, which is a very lively family.

Scientists believe that galaxies once existed in the space where the lone star was located because of the mathematical models built for it, the cosmic dust that covered its surface, the meager atmosphere it carried, and the traces of gravity that could be found everywhere.

Although the sun has lived five billion years since its birth, it is quite young and immature compared to the ghostly visitors from hell that hovers beneath it.

Analysis of dynamic images from radio telescopes scattered around the globe shows that the lone star is almost as old as the universe, and has been around for more than 13 billion years until now.

It is almost certain that before the appearance of the sun, the lone star must have had a more glorious history than it, but unfortunately the mass of the lone star is too large, at least 10 times the mass of the sun, so that it prematurely consumes the amount of hydrogen contained in the core, so it begins to shrink under the action of internal gravity.

Contraction means an increase in the core temperature, and when it reaches a certain point, the reaction from helium fusion to carbon is ignited very violently. The thin material on the surface of the lone star could not resist the pressure released by the helium as it burned, so the helium flash continued to erupt, engulfing all the planets orbiting it and the moons it carried, and the galaxy that once existed ceased to exist. However, thanks to the huge mass of the lone star, it was not destroyed by the helium flash itself, but metamorphosed from a star to a red giant, entering a period of aging, waiting for death.

If the lone star survives a billion years in peace, and then dies quietly, the word "sun" can probably only become the name of a mythical character at best, not to mention the eight planets, and the human beings on Earth will not live on the planet called Earth, and may evolve from apes to humans on other planets, or they may not have a chance to appear at all. At this level, biologists do not dare to make conclusions easily.

But perhaps it was from the moment the lone star expanded into a red giant that the god of the universe demonstrated his power to create new life: the frequent bursts of helium flashes on the lone star threw out a huge nebula, rich in hydrogen molecules and heavy elements, floating far away, and the interior emitted dazzling light like an explosion, turning it into a huge ball of light several light years long.

The colorful and dreamlike ball of light left the lone star that gave birth to it, and it took 100,000 years to float a distance of about 7 light years, when the nebula collapsed at its densest concentration, and the dense structure was like a newly formed uterine embryo, hungry to absorb the surrounding material and grow rapidly. The core in the middle of the dense matter began to rotate faster and faster, causing the friction to cause the core temperature to rise sharply, and the gravitational force compressed the nebula into a circular astrolabe with a diameter of about 200 Earth-Sun distances, and a star was born in the center of the astrolabe, which is the sun that is often used by people on Earth to symbolize hope.

Since its birth, the movement of the sun's core from hydrogen fusion to helium has never stopped, and this young cosmic life has released at least 400 tons of energy per second, and produced a large number of neutrinos and strong electromagnetic radiation, which is the process of continuously releasing light and heat into space.

Earth's astrophysicists have calculated through computer models that the Sun will continue to release energy at this rate until it runs out of hydrogen fuel and changes from hydrogen fusion to helium fusion. Helium fusion will cause the yellow dwarf star to expand violently into a red giant, and even if it is a red giant, it can still hold up tenaciously for a long time until it collapses into a neutron degenerate state, where the strong neutron degeneracy pressure resists the gravitational collapse and forms a neutron nucleus. It's just that at that time, the human beings on Earth will either die out in the helium flash stage of the sun, or they will have migrated out of the solar system and opened up a new world in another cosmic space. In any case, the earth will be safe for five billion years, and the sun will always guard the earth like the god Apollo in Greek mythology. They held this belief firmly and never doubted the loyalty of the sun.

Unfortunately, geoscientists are focused on studying the Sun, and are unaware of a potential threat seven light-years below it until they notice a change in its interior.

The lone star survived to the final stage of the red giant, the reaction of silicon nuclei fusion into iron-nickel. After that, most of the atmosphere that enveloped it was ejected into space, leaving only the neutron star in the center.

Due to the large mass of neutron stars, the gravitational field generated by them begins to distort the surrounding space-time extremely, forming a very special celestial body, a black hole.

Scientists have difficulty calculating the exact time of formation of the black hole below the sun, and can only claim in the form of estimates that this is certainly not a long time, because its pull on the sun's metamorphosis has only begun in the last century, and it is only today that the sun's abnormal state has attracted human attention.

Needless to say, the reason why the sun's lifespan has been greatly shortened, almost called premature, is precisely because it is constantly expending energy to resist the pull in order to get rid of the crazy adsorption of the black hole horizon. But the gravitational pull of the black hole increases indefinitely, and even if the sun runs out of all hydrogen fuel in an Earth year, it will not escape the tragic fate of falling into the black hole.

The earth is more pathetic than the sun, even if it dodges the helium flash and the giant mouth of the red giant, it will still follow in the footsteps of the sun and eventually fall into the boundless black hole.

If human beings want to survive, there are only two possible options:

First, build a large spaceship similar to Noah's Ark, load all the resources that can be used for the continuation of life on Earth, and then escape from the solar system before being captured by the gravitational pull of the black hole, no, it should be destroyed by the sun's helium flash.

Second, use all scientific and technological means to change the orbit of the earth, find a shortcut out of the solar system, and "drag" the earth out of the solar system and float to other places in the universe where it can stay.

The first method sounds feasible, but in fact it seriously violates the democratic consciousness of human civilization in the 23rd century—who should be Noah and his family to set up the ark near Mount Aare when the flood comes?

Of course, as long as there is a possibility of building an ark, someone will try. When life is not threatened, everyone can be a gentleman with good manners, but when the threat comes, and the need to save life is above all else, the desire to survive hidden in the soul will replace the brain and become the driving force that drives people to make decisions. Perhaps at this time, man has lost the advantage of being superior to other species on earth and becoming the master of the earth—having a rational brain and the ability to think.

The second method is an excellent defense of the statesman's theory of world unity, which can guarantee the equality of all human beings, and even all life on earth. As long as Mother Earth is safe, then no matter who or what species, even flowers and trees, can escape the helium flash disaster.

But compared with the first one, this method is even more ridiculous to the scientific community. Perhaps the Earth can really change its orbit, but the only possible cause of this is the impetus of the solar eruption, when the Earth is not a change of orbit for humans, but a "ghost".

Furthermore, the symbol of the Earth's escape from the sun's gravitational pull out of the solar system should be that it has crossed the Kuiper Belt. The Kuiper Belt is 40-50 astronomical units from the Sun, and in order to drag the Earth, with a total mass of 60 trillion tons, to such a long distance without encountering any obstacles, it is necessary to build a safe path in the universe that prevents the Earth from shifting its angles as it travels. How should this path be established? Will even the most advanced space probes work? No one knows for sure.

So some people joked that it seemed that the best way to save the planet was to combine method 1 with method 2, that is, to build a spaceship that could operate on a pre-built trajectory and have enough power to drag the earth in parallel.

In addition to this, a large number of lugs that are tough enough to bear any weight must be wrapped around the corresponding points on the Earth, and the other end is tethered to the spaceship, which will detach from the Earth's orbit before the helium flash and set sail towards the coordinates of the Kuiper Belt, so that Mother Earth can escape the destruction with her children.