30 giug 1908 anni - Tunguska event

Descrizione:

An approximately 12-megaton[2] explosion that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of June 30, 1908. The explosion over the sparsely populated Eastern Siberian Taiga flattened an estimated 80 million trees over an area of 830 sq mi of forest. The explosion is generally attributed to a meteor air burst: the atmospheric explosion of a stony asteroid about 50–60 metres (160–200 feet) in size. The asteroid approached from the east-southeast, and likely with a relatively high speed of about 60,000 mph. It is classified as an impact event, even though no impact crater has been found; the object is thought to have disintegrated at an altitude of 3 to 6 miles rather than having hit the surface of the Earth.

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