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Chuck Blackmanadded this to The Things You Didn't Know
Exploding Asteroids Pose Greater Threat Than Direct Hits

Exploding Asteroids Pose Greater Threat Than Direct Hits

National Geographic - Dan Vergano

An "airburst" warning scale is needed for asteroids, cautions one expert. 4 Minute Read An asteroid bursting apart in midair over a city poses a greater threat to humanity than a long-feared "planet buster" smacking into Earth, suggests one impact expert. He calls for a revised system of planetary …

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