How to defend Earth from asteroids - Phil Plait
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 enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them. (Filmed at TEDxBoulder.)
Talk by Phil Plait.
Talk by Phil Plait.
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