On June 30, 1908, there was an explosion on the earth which was 1000 times more powerful than nuclear bombs in Hiroshima and Nagasaki. This explosion occured in an area near Stony Tunguska River in Yeniseysk Governorate, Russia. This type of explosion had never taken place before and after this event. The light coming out of it was more brighter than the light from the sun. The sound of this explosion was so high that broke windows and doors hundreds of kilometres away. The impact of this explosion was so energetic that knocked people off their feet. After a few seconds, when the sound of the explosion ceased, then the most horrific picture appeared. All the trees in the 2000 square kilometer were burnt. There were around 80 million trees over there. Whether it was an explosion or something else, when the investigation began, then the most surprising things came out. This explosion was 1000 times more powerful than Hiroshima and Nagasaki explosions. But there was no crater on the ground and found no sign of any explosion. It is believed that it happened by an incoming asteroid (or comet), which never actually struck Earth but instead exploded in the atmosphere, causing what is known as an air burst. The Tunguska event has the biggest impact on Earth in history. In the study, it is said that the meteoroid's size was around 60 to 190 metres, based on whether the body was a comet or asteroid. The shock wave from the blast would have measured 5.0 on the Richter magnitude scale. The earthquake of this magnitude is capable of large amount of destruction but due to unpopulated area no damage was done.
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