30 June 1908. See Contributor comments.
    Bark
Herbert writes:
110 years ago, a large meteoroid (probably around 50 to 100 meters
in diameter) entered the Earth's atmosphere over Siberia, and exploded some 5 to
10 kilometers above the ground, with a force of 10 to 30 megatons of TNT. The
resulting air burst flattened some 2.000 kmē of dense forest.
Shown here is a full slice from a tree that survived the Tunguska event, with some
burn marks (red arrow). This particular specimen was collected during the first
Tunguska expedition in 1927, probably by Leonid Kulik himself. |