An asteroid.
An asteroid. - 
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From the Wall Street Journal, this itemin which the phrase "planetary defense" features prominently:

The U.S. has apparently fallen behind on its timeline for getting rid of old nuclear weapons. One reason we're hanging onto them, according to the GAO: Disposition is pending, and "senior-level government evaluation of their use in planetary defense against earthbound asteroids."

I feel much better now.

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Follow Kai Ryssdal at @kairyssdal