How to defend Earth from asteroids
What's six miles wide and can end civilization in an instant? An asteroid — and there are lots of them out there. With humor and great visuals, Phil Plait shows us all the ways asteroids can kill us (yipes), and what we must do to avoid them.
This talk was presented to a local audience at TEDxBoulder 2011, an independent event. TED editors featured it among our selections on the home page.