Many scientists believe that under the general trend of the universe, the end of the earth will eventually come, and it will only be time for human beings to perish.

Harashi Chen also thought about the various ways the earth was destroyed and used this to infer the crisis facing the earth.

Asteroids hit Earth may destroy Earth.

In fact, asteroids attacking the earth are almost inevitable, but they don’t know when asteroids with huge threats will arrive.

At present, we have discovered more than 1,500 asteroids in the universe that can threaten the security of the earth.

In 1908, an asteroid with a diameter of 120 feet (about 36 meters) exploded over Tungus, Russia, and released 1,000 times more energy than the atomic bomb that bombed Hiroshima. Fortunately, no one died in this attack.

Scientists say similar events happen about every 1,000 years. The chances of large-scale asteroids hitting Earth and causing mass extinction of species are once every 100 million years. 66 million years ago, the disaster that caused dinosaurs to extinction could be caused by the impact of asteroids on Earth.

However, Yuan Shichen judged that the crisis facing the earth this time would not be an asteroid impacting the earth, because unless it is an asteroid that is as large as a certain order of magnitude, it is not helpless with the current capabilities of the Earth civilization.

Moreover, if such a huge asteroid really came straight to Earth, it would have been discovered by most people long ago and calculated the exact time of the impact.

In addition, Yuan Shichen also considered the possibility of large-scale solar storms leading to the demise of human beings.

The solar storm triggers flares, sunspots, coronal matter emissions or any matter from the sun, or energy injects into the Earth's magnetic field, similar to artificial electromagnetic pulse weapons. When solar energy particles crash into the Earth with the force that can ionize the atmosphere, a huge cloud of high-energy electronic mushrooms will be generated and constantly bounced in the atmosphere. Even if the heat generated by this phenomenon is not too much, a violent electromagnetic pulse (emp) will mean that all the technological equipment on the Earth will be destroyed. All electronic products will fail, and there is no means to stop this process.

People may think that without any electronic instruments, society can operate as usual for a long time.

However, the actual situation is much crueler, because the earth's agricultural production will collapse, and large-scale famine will starve many people to death and eventually destroy humanity.

However, this will not be a huge crisis facing the earth, because through observations, Yuan Shichen found that the sun above his head was still so warm and gentle, and there was no sign that it would attack the earth and humans.

Yuan Shichen also considered the threats caused by large-scale alien attacks, large-scale plague rage and food crop lesions, but these were not consistent with the potential crisis clues he has learned so far and were ruled out.

Indeed, there are many other reasons that may lead to the destruction of the earth.

However, the only ones that can destroy all life on Earth instantly without warning - supernova explosions and cosmic gamma-ray explosions.

The internal temperature of a huge mass star is much higher than the surface, and the core temperature of the largest supergiant is more than 1 billion megabytes. For a stable star, the theoretical upper limit of the core temperature is 6 billion k. Over this temperature, the photon energy emitted by the internal matter of the star will be high enough to be converted into positive and negative electron pairs when colliding with each other. Such a reaction will make the star lose its stability and eventually be destroyed in a huge supernova explosion.

The inside of a star mainly relies on nuclear fusion to generate energy to fight the star's gravitational force to maintain stability: the outward expansion force formed by energy release is checked and balanced with the star's gravitational force. As the mass accumulation in the star's core, gravity becomes larger and larger, and the raw materials for nuclear fusion become less. When the energy provided between the nuclear fusion and the free electrons cannot resist the gravity, the star will suddenly collapse, reaching more than 45,000 miles per second, and the temperature of the core will increase rapidly. Under the action of gravity, the gas hits the core at the speed of light, and this process will have a "bounce effect". Some of the gases that enter reversely rotate upwards and blow out from the core. The electrons and protons in the core squeeze produce neutrinos. When the neutrinos pass through the dense gas, they are partially absorbed, and the gas obtains huge energy, thus producing a huge explosion, producing x-rays, gamma rays, and ultraviolet rays.

If there is a supernova burst that is particularly close to us, it can completely destroy humans without even using gamma ray explosions.

As we all know, a gamma-ray burst is the most violent explosion in the universe. It is theoretically produced by a huge star collapse and explosion when fuel is exhausted or the merger of two adjacent dense stars (black holes or neutron stars). The gamma-ray burst is as short as a thousandth of a second, or hours long, and releases huge energy in a short time. If compared with the sun, the energy it releases in a few minutes is equivalent to the sum of trillions of years of sunlight, and the single photon energy it emits is usually hundreds of thousands of times that of typical sunlight.

A strong gamma radiation beam. If it is very close to the earth and is facing the earth accurately, the strong beam will move at the speed of light, and we cannot defend it at all. It will destroy all life in an instant, and everyone will become a pile of bones, and in the end, there will be nothing on the earth.

Gamma ray explosions are particularly common in the universe!

Why is it difficult for us to discover intelligent life in the surrounding star systems? Maybe they have been wiped out by gamma ray explosions.

At this time, in the conference room in the core area of ​​the Interstellar Discovery Alliance Pacific Base.

Yuan Shichen was silent, and the commander-in-chief's expression was still very heavy.

"Yes, most of the alien life in the universe may have been swept to death by gamma rays. Perhaps Earth civilization will have such a day." The commander-in-chief's face was full of self-deprecating.

"There is indeed a huge star w, about 8,000 light-years away from the Earth, and a supernova explosion may occur at any time. I have observed that the star w is like a pinwheel, and it faces the earth. The earth is on the path through which the gamma ray burst passes. The large number of gamma rays generated during the explosion will indeed reach the earth." Harashi Chen continued to ask with confusion, "However, this star was discovered as early as the last century. Scientists predict that it may explode at any time in the next 500,000 years, but there has been controversy about when it will explode and whether it will threaten the earth. Could it be that it makes the earth's civilization as if it is facing a great enemy?"

"In fact, scientists have observed its existence as early as the last century during the space race between the United States and the Soviet Union. If the original state is maintained, the star w will not threaten the earth in the near future." The commander-in-chief explained to Hayashi Chan with a deep face.
Chapter completed!