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

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