The document summarizes theories about the cause of the 1908 Tunguska event in Siberia, in which an explosion leveled 800 square miles of forest. Early expeditions in the 1920s found no crater or meteorite fragments, but subsequent hypotheses proposed a meteorite impact. Later studies in the 1990s suggested an exploding alien spacecraft caused the blast. In 2007, Italian researchers claimed to have discovered an impact crater under Lake Cheko near the explosion site.

1. GROUP 6
Piotr Marczyk (Poland)
Damian Stypa (Poland)
Konrad Szota (Poland)
Daniel Jimeno Gregorio (Spain)
Naomi Gutiérrez Frías (Spain)
Raquel Rivero Dorta (Spain)
Viktor (Germany)

2. Tunguska Event
 The event of 30th of June 1908 in the Taiga in Central Siberia (60 ° 53 '8.51 ", 101
° 53' 36.71") in the region of Podkamienna Tunguzka River, north of Lake Baikal.
There was a sudden vast explosion that had fallen down the trees within a radius
of 40 km. It was seen within a radius of 650 km, heard within a radius of 1000 km.
The very strong shock was registered on the seismographs all over the Earth, and
finally - thanks to the special position of the sun during the summer solstice, due to
the reflection of light by dust, which was in the air as a result of an explosion - in
many European cities the phenomenon of "white night” was observed. The impact
was so strong that the Russian magnetometers indicated the second north pole in
the explosion region.

3.  There are many mysteries and ambiguities concerning this disaster.
We still do not really know what caused an explosion being so
powerful. Another unsolved puzzle is the different ​eyewitness accounts
from the area of Angara River and from the region of Lower Tunguzka;
these relationships, among others stand for the different directions of
the movement of the object, and for the different times, in which the
object was observed. Witnesses from the area of Angara talk about the
early morning, the Lower Tunguska - about the afternoon.

4. The study of the phenomenon
 After the bang in Tungus, a number of more or less plausible
hypotheses, aimed at clarifying the cause of that phenomenon arose. To
put an end to unjust speculations, in 1927 - 19 years after the explosion
- the Soviet academic community has decided to send the first major
scientific expedition to the Tunguska Podkamienna region. The study
was conducted by Leonid Kulik of the Soviet Academy of Sciences.
When you find a newspaper archive news about the event, this scholar
has suggested that ​a giant meteorite fell in the area of Siberia. It was
built of iron and nickel. To find the evidence to support this thesis, Kulik
had conducted the research in the area for many years at the top
Stojkowicz bogs. Exploration of Kulik expedition ended in failure – he
could not find any remains of a meteorite or impact crater, but we owe it
a large amount of photographic material, demonstrating the taiga
landscape after the disaster. According to the Czechoslovak astronomer
Lubor Kresák, who expressed his opinion on the expedition in 1978, this
is a proof that the cause of the Tunguska event was a meteoroid, which
was a fragment of Comet Encke being detached.

5. 
Hipothesis Of Korlevic
​
In 1990 the area of disaster was visited by the scientific expedition, consisting of
researchers of Russian, Bulgarian, French, Swedish origin and Croatian Korado Korlevic.
​
This last, after ten days of sampling the ground, said that he made his view on the cause
and course of the Tunguska event. According to Korlevic explosion was caused by the
collision of Earth with a meteorite of the size comparable to the skyscrapers. Twenty
seconds after the explosion at the small height the mushroom cloud of a hot steam at a
temperature of 15 000 ° C occurred, and has "cooked" the entire impact zone - ash and
sand melted to form tektites - Glass beads, found by an expedition of Kulik. According to
the Croatian scientist it created a shock wave spreading in a parallel manner to the
​
surface of the earth, which explains the destruction of forests in the area of 2150 km ² of
an irregular shape. It was seen from above like a butterfly. Korlevic also explains the
unusual shape of trees, which grow to this day in the region of Podkamienna Tunguska -
this would be the result of the burnings resulting from fires, which took place after the fall
of a meteorite.

6. The Hypothesis Of The Spacecraft
 There are many theories based on the fact that aliens were involved
in the Tunguska catastrophe, including the catastrophe of the
extraterrestrial ship or the usage of weapons to cause the impending
threat to the Earth. Jan Pająk put forward the theory that the alien
spaceship with a magnetic drive (magnocraft) was responsible for the
disaster. The explosion released a large energy accumulated in the
magnetic field.

7. Czoko Lake
 In June 2007, Luca Gasparini, Giuseppe Longo and, two researchers from the University
of Bologna, stated that they have found a crater formed by a large meteorite impact or
comet fragment at the surface of the Earth. According to them, the crater is a Czoko lake
located 8 km northwest of the epicenter of the designated location. This is in accordance
with the direction of the testimony of witnesses and the direction of the collapse of the
trees. The oval shape of the lake differs from the other lakes in the area, and at its bottom
the fragments of rock or compacted sediments have been discovered by Italian
researchers. The fragments are probably the remnants of a meteorite. The lake is not
marked on any maps of the area before 1929. The discovery of Italians was later
criticized by Dr. Gareth Collins from London.

8. atching ;)
For W
Thanks