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Over a century ago, on June 30th, 1908 a huge explosion detonated over an unpopulated region of Russia called Tunguska.

New Scientist features editor David Cohen narrates his journey to the site of the Tunguska explosion in Siberia.

Latest research has concluded that the Tunguska explosion was almost certainly caused by a comet entering the Earth's atmosphere. And how researcher Michael Kelly from Cornell University came to that conclusion is quite interesting: He analyzed the space shuttle's exhaust plume and noctilucent clouds.

In 1908, a huge explosion devastated a remote region of Siberia. A century later, its cause remains a mystery. David Cohen investigates