International Asteroid Day
Eyes on Asteroids This day marks the anniversary of the Tunguska event in Siberia, 1908. It was the largest impact in recorded history, but as we touched on before, it never actually hit the ground. It exploded in the air, sending a shockwave that flattened millions of trees across 830 square miles. The largest confirmed impact crater is the Vredefort in South Africa, formed about 2 billion years ago. The Chicxulub crater is buried underneath the Yucatan Peninsula, from 66 million years ago.