At about 7:15 a.m. on June 30, 1908, 114 years ago, people living in the Tunguska River region of Siberia, Russia, saw a huge fireball quickly across the sky, flying from the southeast to the northwest, very dazzling, and a few minutes later, a strong light rose from the northwest, followed by a huge explosion.
The explosion was so loud that people thousands of miles away could clearly hear it, and many people were awakened, which was the famous Tunguska explosion of 1908.
The Tunguska Explosion occurred near the Tunguska River in present-day Siberia, Russia. No one knows exactly whether the diameter of the fireball is 100 meters or 200 meters, or where it came from.
For various reasons, no one launched a timely investigation into the Tunguska explosion, and it was not until 19 years later, in 1927, that the former Soviet Union sent a research team to investigate the mysterious Tunguska explosion.
Seeing the aftermath of the disaster 19 years later, everyone was shocked to close their mouths, and a huge crater with a diameter of about 500 meters appeared in the center of the explosion, and the surrounding 30 kilometers were burned into scorched earth, 80 million trees were torn down, and 2,000 square kilometers of coniferous forests were destroyed, and the explosion power was equivalent to 240,000 tons of TNT.
What happened to the Tunguska Explosion? Some people suspect that someone is secretly testing nuclear weapons, but this is an impossible thing, to know that the world's first atomic bomb was publicly unveiled in 1945, and there was no atomic bomb in 1908, so it cannot be artificial.
Since it is not man-made, then there is only one possibility, the extraterrestrial visitor, experts think it is a small object from outer space, then the question is, is it a rocky asteroid, or a comet, why is the energy generated by the explosion so large?
Now, Russian geophysicists and hydrobiologists are preparing to form a team of researchers planning to investigate the Tunguska Explosion again at the end of February, and in 1927, the mysterious crater seen by soviet researchers has now been turned into a small lake called Cheko Lake.
The research team plans to dive down to 30 meters below Cheko Lake, study the thickness of the sediment and collect the original sample, hoping to find a fragment of the "alien visitor", then the true identity of the alien visitor will be solved, is it a rock asteroid, or a comet? What are the substances contained in the end?
As early as 2020, a research team formed by the Novosibirsk Institute of Nuclear Physics, the Novosibirsk Institute of Geology and Minerals and other research institutes launched an investigation of Tunguska, and the results were really big.
The researchers found some particles in Zapovednoye Lake, 40 kilometers from the center of the Tunguska explosion, that would otherwise not belong to Earth because the particles contained too many elements such as potassium, titanium, yttrium and zirconium, which could be associated with the Big Bang and, apparently, extraterrestrial material from outer space.
The 1908 Tunguska explosion warned us that life on Earth was also threatened by a variety of threats from outer space, cosmic rays, geomagnetic explosions, and small near-Earth bodies, so there were still a lot of threats from outer space, not just a little, which is why some people have proposed to back up human beings on other planets.
When it comes to cosmic rays, it is one of the major injuries of human beings out of the earth, because cosmic rays in outer space are everywhere, and cosmic rays cause strong radiation to the human body.
Every astronaut in space will bring a radiation recorder before the outgoing activity to record the radiation dose of the astronaut, once the radiation dose is close to the limit value that the human body can withstand, then the astronaut must return to the cabin, so as not to affect the physical and mental health of the astronaut.
Is the threat to life on Earth by NEOs even greater? 65 million years ago, a comet struck Earth, causing the Fifth Mass Extinction on Earth, and the dinosaurs that once ruled the entire planet became one of the victims.
At 3:00 a.m. on December 1, 1994, a rumbling sound suddenly appeared over Guiyang City, and an unknown object shot out a strong green light, which caused an explosion after landing on the ground, and hundreds of acres of large trees with thick bowls were cut off. Interesting and informative scientific content, please pay attention to the only WeChat public account: Interesting Exploration