One hundred years ago today, June 30th, 1908, a great explosion rained Hell over Siberia, flattening 830 square miles of forest. Easily big enough to destroy a city, the 30-meter diameter space rock missed Moscow by about 4 hours. And it will happen again. But even as we track the objects headed our way in the next century, the flood of media hype over the centennial this past week shows there are still some major mysteries about the Russian blast that need solving.
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