Tunguska 1908: The Sky Burst That Left No Ground Crater
On June 30, 1908, a sky explosion over Tunguska, Siberia leveled about 2,150 square kilometers of forest with an energy around 10–15 megatons, but left no ground crater because the object disintegrated in the atmosphere at roughly 5–10 km altitude; decades later, Leonid Kulik found no meteorite and a radial pattern of downed trees, supporting the airburst explanation and dispelling sensational theories. The object is believed to have been a ~50–60 meter stony asteroid, though Lake Cheko’s proposed crater remains contested. The event reshaped thinking about space hazards and the need to map near-Earth objects, a lesson underscored by the smaller 2013 Chelyabinsk event.
