In 1908, a massive aerial explosion near Siberia's Stony Tunguska River flattened 500,000 acres (2,000 sq km) of forest—felling an estimated 80 million trees over 830 sq mi (2,150 sq km) and producing a shockwave that shattered windows hundreds of miles away. Known as the Tunguska event, the explosion is thought to have measured 5.0 on the Richter scale, with an estimated energy 1,000 times more powerful than the atomic bomb dropped on Hiroshima. What do most scientists believe caused the event? Discussfrom Article of the Day http://ift.tt/2xxfoMf
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