According to National Georgraphic News today: "Space shuttles blasting off from Earth may have helped solve the mystery of what came careening down from space to explode over Russia in June 1908.
"The so-called Tunguska event leveled 770 square miles (2,000 square kilometers) of forest in a remote area of Siberia.
"What caused the blast has puzzled scientists, because only a handful of people saw the explosion and it left no easily recognizable debris."
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