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Doomsday in Tunguska - Cosmic Catastrophes
Cosmic impacts have happened in the past and they might happen in the future. If a Tunguska-sized explosion occurred today, entire cities could be wiped out.
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Primetime:   Cosmic Catastrophes
Cosmic impacts have happened in the past and they might happen in the future. If a Tunguska-sized explosion occurred today, entire cities could be wiped out.
Aired: 2/21/13
Views: 5431
Network:  TV.com
 
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