SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Growth rings on a larch tree after the Tunguska impact. The increased diameter of each successive ring shows the growth of the tree in a year. This cut supports the hypothesis that growth increased after the Tunguska explosion. In 1908 a large astronomical body exploded above Tunguska, Siberia, Russia. The energy released was equivalent to around 1000 times that of the Hiroshima atomic-bomb.
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