Nuclear One-Two Punch Could Knock Out Dangerous Asteroid

Destroying a dangerous asteroid with a nuclear bomb is a well-worn trope of science fiction, but it could become reality soon enough.

Scientists are developing a mission concept that would blow apart an Earth-threatening asteroid with a nuclear explosion, just like Bruce Willis and his oilmen-turned-astronaut crew did in the 1998 film "Armageddon."

But unlike in the movie, the spacecraft under development — known as the Hypervelocity Asteroid Intercept Vehicle, or HAIV — would be unmanned. It would hit the space rock twice in quick succession, with the non-nuclear first blow blasting out a crater for the nuclear bomb to explode inside, thus magnifying its asteroid-shattering power. 

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