"At around 7:17 a.m. local time, Tungus natives and Russian settlers in the hills northwest of Lake Baikalobserved a column of bluish light, nearly as bright as the Sun, moving across the sky. About 10 minutes later, there was a flash and a sound similar to artillery fire. Eyewitnesses closer to the explosion reported the sound source moving east to north. The sounds were accompanied by a shock wave that knocked people off their feet and broke windows hundreds of kilometres away. The majority of witnesses reported only the sounds and the tremors, and not the sighting of the explosion. Eyewitness accounts differ as to the sequence of events and their overall duration."
Theories about CauseEdit
The mainstream scientific establishment says that the most probable cause is a comet or meteoroid exploding in the atmosphere, producing an airburst.
However, there are alternate theories, inclouding that it was the destruction of a nuclear- or exotically-powered UFO. Others have speculated that the object which fell in Tunguska may have been a miniature black hole or a chunk of antimatter, among other ideas