Tunguska event, 1908: Why Asteroid Day is observed on June 30?
The Tunguska event was a large explosion that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of 30 June 1908. This explosion took place over thinly populated Eastern Siberian Taiga in 2,000 square kilometres (770 square miles) of forest. The explosion is generally credited to the air burst of the meteor. The Tunguska event is the largest impact event on Earth in recorded history. The estimates of the energy of the air burst range from 10–15 megatons of TNT to 30 megatons of TNT. The 15-megaton (Mt) estimate represents an energy about 1,000 times greater than that of the atomic bomb dropped on Hiroshima, Japan in 1945.
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