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    The taiga near the site of the Tungus meteorite fall. (File)

    Tunguska Event: Russian Scientists Debunk Meteorite Theory

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    Lake Cheko was supposed to be the impact crater of the large explosion that occurred near the Tunguska Riva in Russian Siberia, which was detected hundreds of miles away. However, Russian scientists revealed that Lake Cheko is at least 280 years old, which means that the lake dates back hundreds of years before the Tunguska event.

    The so-called Tunguska event is still a mystery after 108 years. It is the largest impact event on Earth in recorded history.

    On the morning of June 30, 1908 a large fireball crossed the sky above the taiga over the Stony Tunguska River in Krasnoyarsk Krai in Russian Siberia. A large explosion followed, which could be heard even in the distant villages 745 miles away and visible even in Britain. It flattened 2,000 km2 (770 square miles) of forest. During the following days, strange phenomena were observed in the skies above Europe, such as silvery, glowing clouds, colorful sunsets and a strange luminescence in the night.

    Russian newspapers soon reported that it was a meteorite impact, while foreign newspapers speculated on various scenarios from a volcano eruption to a UFO accident. However, the unpredictable political situation in Russia at that time prevented further investigations.

    Diamond-graphite growths from the place where the Tunguska meteorite fell on the Podkamennaya Tunguska River near Vanavara, Krasnoyarsk Territory. (File)
    © Sputnik/ Vasiliy Litosh
    Diamond-graphite growths from the place where the Tunguska meteorite fell on the Podkamennaya Tunguska River near Vanavara, Krasnoyarsk Territory. (File)

    After 13 years the first research expedition led by Russian mineralogist Leonid Kulik visited the Tunguska. Despite exploring the entire area, they didn’t discover a single great crater or meteoritic material. To explain this fact Kulik suggested that some natural extraterrestrial solid exploded in the Earth’s atmosphere.

    Over time, many other theories, some quite unusual, have been proposed to explain the apparent lack of craters and missing extraterrestrial matter.

    In 2007 a research team of the University of Bologna in Italia led by Luca Gasperini proposed that a small lake in the region, Lake Cheko, may have been the impact crater. Their assumptions were based on the fact that the lake is unusually deep for the region and its shape looks like a crater. Moreover, there is no record of the lake existing before 1908. Gasperini's evidence is controversial, as seen in one published answer to this research.

    Trees lie strewn across the Siberian countryside 45 years after a meteorite struck the Earth near Tunguska, Russia. (File)
    © AP Photo/
    Trees lie strewn across the Siberian countryside 45 years after a meteorite struck the Earth near Tunguska, Russia. (File)

    It July 2016 a team of Russian researchers from Krasnoyarsk and Novosibirsk explored Lake Cheko again in order to estimate its real age. The region was poorly mapped before the 20th century, so the lake might have existed before 1908, they presumed. The age of a lake can be estimated by assessing its bottom sediments.

    Last year the scientists obtained a core sample of bottom sediments from the deepest trench of Lake Cheko to make geochemical and biochemical analysis. Recently their colleagues from the Institute of Geology and Mineralogy, Siberian Branch of The Russian Academy of Sciences (RAS) completed radioscopic analysis of the core samples, a press release at The Russian Geographical Society website says.

    The study showed that the deepest sample is about 280 years old, which means that the lake is probably even older, because the researchers did not manage to obtain samples from the very bottom. Nevertheless, this proves that Lake Cheko is much older than the Tunguska event and is not an impact crater of a supposed Tunguska meteorite impact.

    The results of the study will be published in one of scientific previewed journals on July 30, 2017, at the anniversary of the Tunguska, according to Denis Rogozin, senior research worker at Krasnoyarsk Research Center Siberian Branch of RAS.

    The results of Russian scientists’ research left the academic society without the last straw they grasp in the hope to find any evidence that the Tunguska event actually was a meteorite impact and made the Tunguska event really mysterious again.

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    Tags:
    asteroid collision, meteorite, mystery, asteroid, research, meteor, science, Russia, Krasnoyarsk region, Siberia
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    • avatar
      slimyfox
      And here we go again with some seriously silly stuff. Someone wants to cash on a "mystery of Tunguska" with some new theory that it was actually UFO exploding or even nuclear bomb 108 years ago and so on.

      That is incredibly stupid. If the meteorite was large stony one and was moving in extreme speed of let say 40 - 60 km/sec and would enter atmosphere under limited angle just below bounce it would have very long trajectory through atmosphere and would overheat to the point of becoming a plasma which is normal effect in ultrasonic speed. Faster it moves greater friction is and with that greater temperature. Plasma can reach incredibly high temperature of several million degrees and that would transform the rest of material into plasma and there would be s contradicting forces caused by superheat and pressure as in that moment all rocky mass would just become super compressed and overheated plasma and normal physical effect would be blow up with all mighty boom, tremendous shock wave but no material impact as plasma would only burn - scorch ground not create crater as explosion would occur very high in the sky in my opinion over 30 km high and rare atmosphere would greatly reduce that incredible powerful event as if there is a little atmosphere than shock wave is rapidly loosing effect as cannot create super compressed shock wave.

      Anything else would not hold the water as there are no material (meteoric) residues left, neither is any measurable radioactivity which would be normal occurrence in case of artificially made object such as UFO or any kind of alien nuclear weapon.
    • NATOisEVIL
      Could it have been a "comet" instead of an meteor?
    • Angus Gallagher
      Perhaps it was a small asteroid that exploded in the atmosphere. Traces of iridium are more important as forensic indicators than any need for an impact crater.
      The UFO theory is not really viable- with the caveat that to be scientific in our approach- we shouldn't exclude anything.
      There's certainly no need to mock the UFO community as has slimyfox.
      If people don't believe in UFOs that's fine- but there's no need for belittling the community as such.
    • avatar
      geraldoluislino
      Hey guys, do your homework better! Nobody speculated about UFOs by the time of the explosion. The so-called UFO hypothesis for the Tunguska blast emerged only in the 1950s, after the Russian writer Alexander Kasantsev published a sci-fi book with this argument.
    • avatar
      Qin reply toNATOisEVIL(Show commentHide comment)
      NATOisEVIL, Perhaps it was a comet. But I think the most likley cause of this event is Putin.
    • avatar
      francescoslossel
      asteroid's matter are very, more than we knows, different so it's quite probable that the last, 108 years ago, could bear elements like Uranium which in particular conditions can sublime in a instant liberating enormous energy, the older perups bigger but of another substance, colliding Earths crust made the lake, maybe...
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