The Hyper Velocity Projectile: How the Navy Could Fire 5,600 MPH 'Bullets' at Missiles | The National Interest Blog: "The Pentagon is pursuing an innovation missile-defense system that could address some of the shortcomings of the existing systems it deploys.
There are a number of major (somewhat interrelated) obstacles to defending against a missile attack. The first is simply the sheer technological challenge of using a missile to destroy another fast-moving missile. This is sometimes compared to trying to shoot a bullet with another bullet. The other is the cost equation: because of the technological challenges involved, missile-defense interceptors are inherently more expensive than the offensive missiles they are trying to destroy. " Read More
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