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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.

www.centauri-dreams.org/?p=8397 - Preview

astronomy comets tunguska impact

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

www.universetoday.com/...fireball-a-comet-chemical-bomb - Preview

tunguska comets asteroids impact

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

www.newscientist.com/...-the-day-the-sky-exploded.html - Preview

tunguska asteroids comets siberia 1908

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

www.youtube.com/watch - Preview

Tunguska impact asteroids