Ideas worth spreading

How to defend Earth from asteroids

2,456,004 views | Phil Plait • TEDxBoulder 2011

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.

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's editors chose to feature it for you.

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Phil Plait has spent his life evangelizing science, getting the word out about the real world and how we know what we know about it.

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This talk was presented to a local audience at TEDxBoulder 2011, an independent event. TED's editors chose to feature it for you.

Read more about TEDx.