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.
https://embed.ted.com/talks/phil_plait_how_to_defend_earth_from_asteroids
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From TED Talk: Defending Against the Earth Killer Asteroid published September 12, 2017 at 07:26AM.