Tunguska event

Tunguska Event. Capture date: 1927 by Leonid Alekseyevich Kulik August 19, 1883 – April 14, 1942, Russian mineralogist who is noted for his research into meteorites.

In 1927, Kulik led the first Soviet research expedition to investigate the Tunguska event, the largest explosion / impact event in recorded history, which had occurred on June 30, 1908. Although the meteoroid or comet appears to have burst in air rather than hitting the surface, the event is referred to as an impact. Estimates of the energy of the blast range from 5 to 30 megatons of TNT, about 1,000 times more powerful than the atomic bomb dropped on Hiroshima, Japan. The explosion knocked down an estimated 80 million trees over an area covering 2,150 square kilometres (830 sq mi)

The Tunguska event occurred near the Podkamennaya Tunguska River in what is now Krasnoyarsk Krai, Russia, at about 07:14 KRAT (00:14 UT) on June 30 [O.S. June 17], 1908. The explosion, having the epicentre (60.886°N, 101.894°E), is believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres (3–6 mi) above the Earth's surface.

This image (or other media file) is in the public domain because it's copyright has expired. This applies to the United States, where Works published prior to 1978 were copyright protected for a maximum of 75 years. See Circular 1 "COPYRIGHT BASICS" PDF. Works published before 1923 are now in the public domain.

This image is also in the public domain in countries that figure copyright from the date of death of the artist (post mortem auctoris), in this case,  Leonid Alekseyevich Kulik August 19, 1883 – April 14, 1942 , and that most commonly runs for a period of 50 to 70 years from the last day of that year. +sookie tex

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