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The day the sky fell. A hundred years after Tunguska. How are frequent are they?
Chelyabinsk had a yield of about 500 kt. Tunguska was estimated at 3-5 mt. These smaller hits are probably more frequent than the dinosaur-killing Chicxulub strike. Only recently have we started watching the skies.
And if we do find a threat the political system has to figure out what next. The use of nuclear explosive devices is an international issue and will need to be addressed by the United Nations Committee on the Peaceful Uses of Outer Space.
