What Really happened in Tunguska (Russia) in 1908.

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on March 08 1908, A large object blasted over the atmosphere of Tunguska - A siberian part of Russia, The blast was equivalent to the power of 15 Million Tons of TNT and it levelled Thousands of square killometers of forest and the blast site was similar to that of Atomic blast and 1908 there was no atomic bomb. Few people say that it is a meteorite and few merchants travelling through Gobi desert of China reported to have seen a flying disk which flew towards Siberia. The disk looked as if it was flying with some technical problems. Though there are evidences to prove that the 'thing' blasted over tunguska was a meteorite. However there are also some evidences according to UFOlogists that the 'thing' blasted was a flying Disk might have originated from outside earth/ Alien craft. I would request you to please give me your opinion about this topic, There are some discussions and information already available under similar headings available over the internet, You can refer the available information if you want to know more in order to give your opinion. Thank you. Regards