NOVA S23E04 The Doomsday Asteroid 1995 VHSrip avi

How great is the risk to human civilization from asteroids and comets? When a meteor exploded in the atmosphere over a remote region of Tunguska, Siberia in 1908, it released the energy of a forty megaton bomb. Had the meteor entered the atmosphere two hours earlier, it would have vaporized St. Petersburg. Many astronomers think a Tunguska-sized meteor will invade earth's atmosphere again in the next fifty to one hundred years. Some predict another asteroid cataclysm similar to the one that may have wiped out the dinosaurs sixty-five million years ago. This episode explores these possibilities and asks: How safe are we?



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Movie name : NOVA.S23E04.The.Doomsday.Asteroid.1995
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Language : ENGLISH