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< Seattle's Morning News with Dave Ross

Dr. Ed Lu on preventing asteroids from hitting Earth - before it's a near threat

Originally aired: Tuesday, April 22, 2014

Lu says the largest asteroids - the world-ending apocalyptic ones, are being tracked, by telescope (not by radar.) But asteroids that are just a little bit smaller, the much more common ones that would only say, destroy something the size of a large city, aren't being tracked at all.

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