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Asteroid attack 2 - Where's the evidence? - What Really Killed the Dinosaurs? - BBC

Scientists believe a massive asteroid is the most likely explanation for the extinction of the dinosaurs. However, if an asteroid did wipe out all species of dinosaur there should be a 200 km crater somewhere on the planet. Scientists hunt for this asteroid evidence in this video from BBC Horizon's 'What Really Killed the Dinosaurs?'. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel
Length: 02:06

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