Эта книга будет изготовлена в соответствии с Вашим заказом по технологии Print-on-Demand. Внимание! Книга представляет собой набор материалов из Википедии и/или других online-источников. High Quality Content by WIKIPEDIA articles! The Tunguska Event, or Tunguska explosion, was a powerful explosion that occurred over the so-called Southern swamp, a small morass not far from the Podkamennaya (Lower Stony) Tunguska River in what is now Krasnoyarsk Krai of Russia, at 0 hours 13 minutes 35 seconds Greenwich Mean Time (around 7:14 a.m. local time) on June 30, 1908 (June 17 in the Julian calendar, in use locally at the time). Although the cause of the explosion is the subject of debate, it is commonly believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres (3.1–6.2 mi) above the Earth's surface. Different studies have yielded varying estimates of the object's size, with general agreement that it was a few tens of metres across.

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