How to defend Earth from asteroids

By Phil Plait from TED in ASTRONOMY , PHYSICS

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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 TED audience with all the ways asteroids can kill, and what we must do to avoid them.

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1 year, 11 months ago
We have Ion Engins! Cool stuff.
Henry Morgan
1 year, 12 months ago
Henry Morgan
A extremely unlikely risk, but extremely terrible consequences...

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