Tunguska – Thousands of square kilometres of trees were burned
In the early morning of 30 June, 1908, witnesses told of a gigantic explosion and blinding flash. Thousands of square kilometres of trees were burned and flattened.
Scientists have always suspected that an incoming comet or asteroid lay behind the event – but no impact crater was ever discovered and no expedition to the area has ever found any large fragments of an extraterrestrial object.
The explosion, equivalent to 10-15 million tonnes of TNT, occurred over the Siberian forest, near a place known as Tunguska.
A flash fire burned thousands of trees near the impact site. An atmospheric shock wave circled the Earth twice. And, for two days afterwards, there was so much fine dust in the atmosphere that newspapers could be read at night by scattered light in the streets of London, 10,000 km (6,213 miles) away.
Nearly a century later, scientists are still debating what happened at that remote spot. Was it a comet or an asteroid? Some have even speculated that it was a mini-black hole, though there is no evidence of it emerging from the other side of the Earth, as it would have done.
Rad full story at Uphaa