From the Wall Street Journal, this item, in 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.
“I think the best compliment I can give is not to say how much your programs have taught me (a ton), but how much Marketplace has motivated me to go out and teach myself.” – Michael in Arlington, VABEFORE YOU GO