Tunguska
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Tunguska (Тунгуска) is a remote, largely uninhabited region in Siberia, Russia. It is known for an enormous impact event near the Stony (Podkamennaya) Tunguska River at about 7:17 AM local time, on the morning of June 30, 1908, which felled an estimated 60 million trees over 2,150 square kilometres but did not leave a crater. The impact was felt as far away as 1,000 kilometres. At 500 kilometres, witnesses claimed to have heard a 'deafening bang' and to have seen a cloud on the horizon. The size of the blast is said to have been the equivalent of between 10 and 15 megatons of TNT (40 to 60 petajoules). The conventional explanation is that it was caused by the explosive disintegration of a stony object about 60 metres across at an altitude of about 8 kilometres, but there are many things which are not explained by this theory. Numerous hypotheses about UFOs and other phenomena have been suggested over time; for more details, see the article on the Tunguska event.