The Tunguska event of 1908 involved an atmospheric explosion of an estimated 15-megaton force, equivalent to large hydrogen bombs. Believed to be a fragment of Comet Encke, the object was around 150 feet in diameter and detonated miles above Siberia, flattening over 820 square miles of forest and causing significant environmental impact.
Evidence suggests a large crater lies beneath Antarctic ice, challenging previous assumptions about ocean impacts. Marine geologists are re-evaluating tsunami origins, considering large extraterrestrial object impacts as a potential cause over volcanic activity. The frequency of non-crater-forming impacts like Tunguska indicates a historical undercounting of Earth's impact events.
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