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The Doomsday Asteroid (#2212)

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? [56 minutes] Closed Captioning

This episode has not aired in the past few months on Iowa Public Television.

PBS Video

Information For Teachers

Grade Levels
6-8, 9-12
Curricular Areas
Science & Technology
Series Length
440 episodes
Average Episode Length
61 minutes
Record Rights
Record and retain for 1 year from each broadcast. No duplication allowed.
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Series Description: PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA programs demystify science and technology and highlight the people involved in scientific pursuits.

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These episodes of NOVA aired in the last few months on Iowa Public Television.

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