June 30, 1908, in central Siberia, a huge aerial explosion takes place, presumably caused by a comet fragment formed by ice that, when it explodes in the Earth's atmosphere, destroys about 2,000 km2 of pine forests

On this day (June 30), 1908, near the Podkamennaya Tunguska River, in central Siberia, a huge aerial explosion takes place, presumably caused by a comet fragment formed by ice that, when bursting into the earth's atmosphere, devastates about 2,000 km2 of pine forests.
The explosion over the sparsely populated East Siberian taiga flattened an estimated 80 million trees in an area of ​​2,150 km² of forest. The explosion is generally attributed to the air burst from a meteoroid. It is classified as an impact event, even though an impact crater has never been found; the object is believed to have disintegrated at an altitude of 5 to 10 kilometers rather than hitting the Earth's surface.
Due to the remoteness of the site and the limited instrumentation available at the time of the event, modern scientific interpretations of its cause and magnitude have been based primarily on damage assessments and geological surveys conducted many years after the event.
The first scientific expedition to reach the area did so 19 years later. In 1921, Leonid Kulik, the chief curator of the St. Petersburg Museum's meteorite collection, led an expedition to Tunguska. However, harsh conditions in the interior of Siberia prevented the team from reaching the blast area. In 1927, a new expedition, again led by Kulik, finally managed to reach the goal.
Studies have produced different estimates of the size of the meteoroid, on the order of 50 to 190 meters, depending on whether the body entered at low or high speed. It is estimated that the shock wave of the airburst would have measured 5.0 on the Richter magnitude scale, and estimates of its energy ranged from 3 to 30 megatons of TNT (13-126 petajoules) (could be equivalent to around 185 Hiroshima bombs).
The Tunguska event is the largest recorded Earth impact event in history, although much larger impacts have occurred in prehistoric times.
As a curiosity, comment on the testimony of a witness who was about 64 kilometers from the epicenter, in Vanavara, who witnessed the explosion of heat while being fired from his chair;

Suddenly, in the northern sky... the sky split in two and, above the forest, the entire northern part of the sky seemed to be covered in fire... At that moment, there was an explosion in the sky and a great crash... The crash was followed by a sound like stones falling from the sky or guns being fired. The earth shook.

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- what happened?
- what happened?
- was it you?
- not
- could it have been a meteorite?
- a meteor?
- maybe
- and why would it make so much noise to put gold in a box?
- insert gold?
- didn't you say that?
- no, I said meteorite
- well, put "orito"
- no, a meteorite is a boulder that comes from space and can hit the Earth
- ah... ok... wow... well that's it...

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