As estimates of meteor strikes rise, how can Earth avoid destruction?

By PBS Newshour
Saturday, November 9, 2013 9:55 EDT
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Russian meteor as seen in February 2013 [AFP]
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It’s not just in sci-fi movies. Asteroids really are moving closer to Earth more frequently and chunks of them are hitting too. The one that caught everyone’s attention struck last February, when a meteor hit near the Russian city of…

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