Tuguska Explosion: 100 Years Later, Still Unsolved

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… » 6/30/08 2:00pm 6/30/08 2:00pm