In August 1945, at the end of World War II, the United States dropped the first *** that shocked the world in Hiroshima, Japan. The explosion of this *** 1,800 feet above the ground brought great disaster to the people of Hiroshima. However, the devastation in Hiroshima*** unexpectedly gave new revelation to scientists studying the "Tunguska explosion".

The thunderous explosions, the soaring pillars of fire, the mushroom-shaped clouds of smoke, the violent earthquakes, the powerful shock waves, and the radiation of light are all so similar to the Tunguska explosions that they are so vivid that they are vividly remarkable. Thus, Kasatsev, a military engineering expert in the former Soviet Union, boldly put forward a new idea for the first time that the Tunguska explosion of 1908 was a thermonuclear explosion.

In 1946, Kasatsev, who proposed the "thermonuclear explosion theory", not only affirmed that the "Tunguska explosion" was a nuclear explosion, but what is even more amazing was that he also put forward such a bold speculation for the first time soon after: the mysterious monster of the Tunguska explosion was the first spacecraft to visit our earth.

Antimatter impact says –

In 1965, three American scientists suggested that the Tunguska explosion might have been caused by an antimatter ——— antimeteorite that had descended from space on Earth. On that day, a meteorite consisting of "antimatter" accidentally broke into the Earth and caused the disaster, they said in their investigative report. They believe that the collision of half a gram of "anti-iron" and half a gram of iron is enough to produce a destructive force greater than that of the *** that exploded in Hiroshima.

Black hole impact says –

In 1973, two scientists from the University of Texas in the United States, ——— Jackson and Leyan, based on the theory of black hole objects, believed that the "Tunguska Big Bang" was caused by the strong gravitational pull of miniature black hole objects. ”

The comet impact says –

The first person to put forward the "comet impact theory" was Petrov, an academician of the former USSR Academy of Sciences. He thought that the Tunguska explosion was caused by a comet made up of loose snow masses from far away in the solar system. When it breaks through the atmosphere on the Earth's surface at a speed of 40,000 kilometers per hour, it produces superheated gases due to friction. As soon as this gas touched the ground, a huge shock wave equivalent to several *** destructive forces occurred, and because the comet quickly evaporated, no debris was left on the earth as "physical evidence".

Just as the once-prosperous reptilian dinosaurs mysteriously disappeared from the earth 65 million years ago, the "first generation of human civilizations" mysteriously disappeared from the earth for some reason. Of course, this hypothesis needs to be further examined by scientists. If this assumption is true, then what is the culprit behind the destruction of the "first generation of human civilization"?

At the beginning of this century, a mysterious explosion in Siberia provided a clue to scientists seeking answers.

On June 30, 1908, in the Tunguska region of present-day Siberia, Russia, a huge fireball pierced the vast night sky, and then triggered a large explosion equivalent to the sum of the energy of 1,000 Hiroshima***, which caused a fire that burned hundreds of miles of primeval forest and herds of reindeer turned to ashes in the fire. Within days of the explosion, the 9,000-mile sky over the Tunguska region was shrouded in an eerie orange yellow, like a huge fireball, and people as far away as Western Europe could read the newspaper at night without lights!

Due to the remoteness of the Tunguska region, the first decade of the Big Bang was unnoticed. It wasn't until 1927 that Kulik, a geologist from the former Soviet Union, led a team to the site. The endless stretch of charred trees led the expedition members to conclude that the fire was burning over a large area. Some members of the expedition speculated that the fire was caused by a volcanic eruption. But no crater was found in the blast zone, and apparently, this speculation is wrong.

Determined to find out the true cause of the explosion, Kulik interviewed many witnesses to the fireballs falling from the sky, and entered the Tunguska region four times in succession, conducting detailed field investigations, and finally, he came to the conclusion that it was a huge meteorite that burned and decomposed fully after rubbing against the atmosphere in rapid motion, causing the explosion. However, if this is the case, it is certain that meteorite fragments can be found in the area, and unfortunately, Kulik and many expedition members did not find any meteorite fragments despite all their efforts.

During World War II, the investigation into the Tunguska explosion was interrupted for a time. After World War II, because mankind experienced the power of nuclear explosions for the first time, some people pointed out that only nuclear explosions can have such a huge destructive power. However, it was in the 40s of the 20th century that mankind mastered the technology of nuclear explosions, so how did the nuclear explosion in 1908 come about? There can only be one explanation: it was done by aliens. For a time, this idea was a sensation, and the whole world was boiling over it. Scientists have speculated that it was an alien spacecraft accident, and that there were experiments conducted by aliens on Earth, but there is no scientific basis for this speculation.

Tunguska attracted enough attention from scientists in the former Soviet Union, and many first-class scientists went to Tunguska every summer to investigate, and they collected a lot of information.

One of them, a scientist named Fast, measured that the trees destroyed by the explosion covered about 850 square miles. After another 35 years of hard work, Fast put together a detailed map of the destroyed trees in the area. According to this map, scientists calculated that this primeval forest was destroyed by an explosion at an altitude of 4 miles above the ground by a celestial body flying from west to east, equivalent to 1~20 million *** equivalent. In this way, the real cause of the Big Bang gradually emerged.

With the collapse of the Soviet Union, the Cold War ended. A large number of Western scientists flocked to the city, and their interest in Tunguska was obvious, and understanding the true cause of the Big Bang was crucial for humanity itself. Putting aside the existence of the "first generation of human civilization" and how it was destroyed, it is not a small progress for scientists to understand the reason for the mysterious disappearance of dinosaurs 65 million years ago.

Italian nuclear physicists used the heavy isotope method to determine that the fir destroyed in 1908 had much higher levels of trace elements than in other years, and that these trace elements could not have originated on Earth, and that the Big Bang was related to meteorites.

In the laboratory, American scientists used computers to simulate the vacuum effect of the Big Bang: When a meteorite with a diameter of about 200 feet crashed into the earth at an angle of 45 degrees, due to the violent friction with the atmosphere, it fully burned and decomposed, and exploded at an altitude of exactly 4 miles above the ground.

Because meteorites come from outer space, the determination of the authenticity of meteorites requires instrument identification, and the naked eye only has an auxiliary role. Most meteorites come from the asteroid belt between Mars and Jupiter, and a small number from the Moon and Mars. Meteorites can be roughly divided into stony meteorites, iron meteorites, and mixed meteorites of stone and iron.

The average density of meteorites is between 3~3.5, and the main component is silicate. Meteorite has a density of 7.5~8.0 and is mainly composed of iron and nickel. The composition of meteorite is between the two, and the density is between 5.5~6.0. Meteorites vary in shape, the largest meteorite is the Jilin No. 1 meteorite, which weighs 1,770 kilograms, and the largest meteorite is the Goba meteorite from Namibia, which weighs about 60 tons. The crown of Chinese meteorites is a "silver camel" found in Qinghe County, Xinjiang, weighing about 28 tons.

More than 40,000 meteorite samples have been collected worldwide, in a variety of styles. They can be broadly divided into three main categories: stony meteorites (the main component is silicate), iron meteorites (iron-nickel alloys), and stony-iron meteorites (iron and silicate mixtures).

Meteorite refers to the remnants of meteorites that fall to the ground, which are composed of minerals such as iron, nickel, and silicate, and are also known as meteorite stones. It also refers to meteorites that contain more or all of the stony material. A large amount of organic matter such as ammonia, nucleic acids, fatty acids, pigments, and 11 kinds of amino acids have also been found in meteorites with high carbon content, so it is believed that the origin of life on Earth has a considerable relationship with meteorites.

In observation, it was found that there is an asteroid belt between the orbits of the planets of the solar system, Mars and Jupiter, which is the home of meteorites.

When a meteor enters the atmosphere, it explodes due to high temperature, high pressure and internal imbalance, forming a meteorite shower. When the unburned falls to the earth, it becomes a meteorite. A crater with a depth of 170 meters and a diameter of 1,240 meters has been discovered in Arizona, USA. There are also large craters in Antarctica, up to 300 kilometers in diameter. In the middle of the Atlantic Ocean, a giant crater with a diameter of more than 1,000 kilometers has been discovered.

At this point, Hua Feng was also more inclined to the meteorite exploding in the air, resulting in such a weird hellish scene. Whether these things would be the harbingers before the spatial fusion back then, he couldn't guess at will.

After returning from the archives, Hua Feng asked Yun Meng and Bai Feng to go to the platform with a beautiful sunset, and now the students call those platforms - Jintai Sunset. A nice name, every time you come back from a mission, if it happens to be dusk, those students who have completed the mission will enjoy a moment of sunset relaxation on it, although it is short-lived, but it makes people feel precious.

Watching the sunset, Hua Feng and Yun Meng, Bai Feng, enjoying a rare tranquility, they hadn't returned to the ground for a month.