The Catcher in the Sky

“North Korea can make a nuclear bomb and has an intercontinental ballistic missile capable of reaching the U.S. mainland. If it launches such a missile, the United States has a $40 billion system designed to destroy the bomb in space. What’s unknown is whether it will succeed.” From WaPo: If North Korea fires a nuclear missile at the U.S., how could it be stopped? (I’m asking for a friend. Actually, all of them.)