June 30, 1908 - what is believed to be a meteor or comet explodes over the Tunguska River in Siberia. The largest impact event in recorded history, the explosion is estimated to be roughly equivalent to a thermonuclear bomb. The explosion knocked an estimated 80 million trees down over an area covering 2,150 square kilometres (830 sq mi).June 30, 1908 - what is believed to be a meteor or comet explodes over the Tunguska River in Siberia. The largest impact event in recorded history, the explosion is estimated to be roughly equivalent to a thermonuclear bomb. The explosion knocked an estimated 80 million trees down over an area covering 2,150 square kilometres (830 sq mi).
June 30, 1908 - what is believed to be a meteor or comet explodes over the Tunguska River in Siberia. The largest impact event in recorded history, the explosion is estimated to be roughly equivalent to a thermonuclear bomb. The explosion knocked an estimated 80 million trees down over an area covering 2,150 square kilometres (830 sq mi).