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This remarkable occurrence is called the Tunguska Event.
Some scientists have suggested that it was caused by a piece of hurtling antimatter, annihilated on contact with the ordinary matter of the Earth, disappearing in a flash of gamma rays. But the absence of radioactivity at the impact site gives no support to this explanation.
Others postulate that a mini black hole passed through the Earth in Siberia and out the other side. But the records of atmospheric shock waves show no hint of an object booming out of the North Atlantic later that day.
Perhaps it was a spaceship of some unimaginably advanced extraterrestrial civilization in desperate mechanical trouble, crashing in a remote region of an obscure planet. But at the site of the impact there is no trace of such a ship.
Each of these ideas has been proposed, some of them more or less seriously. Not one of them is strongly supported by the evidence.
The key point of the Tunguska Event is that there was a tremendous explosion, a great shock wave, an enormous forest fire, and yet there is no impact crater at the site. There seems to be only one explanation consistent with all the facts: In 1908 a piece of a comet hit the Earth.
In the vast spaces between the planets there are many objects, some rocky, some metallic, some icy, some composed partly of organic molecules. They range from grains of dust to irregular blocks the size of the State of New York. And sometimes, by accident, there is a planet in the way. The Tunguska Event was probably caused by an icy cometary fragment about a hundred meters across-the size of a football field-weighing a million tons, moving at about 30 kilometers per second, 70,000 miles per hour.
If such an impact occurred today it might be mistaken, especially in the panic of the moment, for a nuclear explosion. The cometary impact and fireball would simulate all effects of a one megaton nuclear burst, including the mushroom cloud, with two exceptions: there would be no gamma radiation or radioactive fallout.
Could a rare but natural event, the impact of a sizable cometary fragment, trigger a nuclear war? A strange scenario: a small comet hits the Earth, as millions of them have, and the response of our civilization is promptly to self-destruct. It might be a good idea for us to understand comets and collisions and catastrophes a little better than we do.
Carl Sagan, from his book Cosmos, Heave and Hell
August 02, 2007
Today is the anniversary of a letter that changed history. The letter, dated August 2, 1939, was written by physicists Albert Einstein and Leo Szilard; it was addressed to the President of the United States Franklin Delano Roosevelt. The letter's content warned the president of the Nazi's possible use of uranium for the development of atomic weapons.
Prediction of the Angel of Lightness on 2008
A little after the Centenary of this event new discoveries peformed by scientists researching in the so called Yakutia death Valley will reveal to the humanity the existence of certain type of Complex energetic plant that remains in the underground of Siberia, and that periodically .......with the arrival of a comet .......is responsible of the ocurrence of a so powerful explosion like the one registered in June 30th of 1908 over the region of Evenkia.
The study of the mysterious 'terminator' flying spheres that for centuries have been part of the legends and myths of the Tungus, Evenkis and Yakuts peoples of Siberia is going to give a so impressing explanation of this strange but real source of energy existing in the region.
It is in the Death valley of Yakutia in which the expeditions will find enough evidence ..