National Geographic DVD - Asteroids - Deadly Impact

Asteroids and comets: Every year, millions of these stray bullets streak through the skies, and tons of small meteorites strike our planet. Join renowned geologist Eugene Shoemaker and his wife, Carolyn, who together have remapped the heavens with their discoveries of more than 30 comets and hundreds of asteroids. Were Dinosaurs wiped out by a giant cosmic collision? Could it happen again? Explore these and other questions. Total running time : 60 minutes.