Photo from the Soviet Academy of Science 1927 expedition, led by Leonid Kulik, showing trees knocked over by the Tunguska blast in 1908. Image via Wikipedia.
June 30 is Asteroid Day 2020
On the morning of June 30, 1908, the largest asteroid impact in recorded history occurred in a remote part of Siberia, Russia. The explosion happened over the sparsely populated Eastern Siberian taiga, above Siberia’s Podkamennaya Tunguska River in what is now Krasnoyarsk Krai. The blast flattened an estimated 80 million trees over an area of 830 square miles (2,150 square km) of forest. We now celebrate Asteroid Day each year on the anniversary of what is now known as the Tunguska event.
Witnesses reported seeing a fireball – a bluish light, nearly as bright as the sun – moving across the sky, followed by a flash and a sound similar to artillery fire. Along with the sound was a powerful shockwave that broke windows hundreds of miles away and knocked people off their feet. The explosion in the sky was like nothing ever seen before.
Even though there was no crater found, it is still categorized as an impact event, and is believed to have been caused by ...