On June 30, 1908, a giant fireball exploded over the forests of Tunguska in Siberia.
The impact leveled hundreds of miles of forest, and the exact cause is a bit of a mystery.
At the time of the explosion, it was too difficult to reach this remote part of Siberia to look for clues about what might have happened.
But finally in 1927, a scientist named Leonid Kulik led the first research expedition to investigate the scene.
However, they didn’t find a crater or any meteorite fragments, and the mystery remained unsolved.
Scientists now believe either a comet or an asteroid exploded in the atmosphere instead of striking Earth.
This created an air burst with shock waves powerful enough to knock down a forest.
People around the world commemorate this event by celebrating World Asteroid day.
Source: https://www.space.com/39251-on-this-day-in-space.html