Tim Jung with the new UXR, the next-generation portable radiometer for missile defense-related applications. Credit: Jennifer Lauren Lee/NIST If you're undergoing a missile attack and that missile is above the atmosphere, the best place to destroy it is while it's still in space. To do that, you need to be confident that the missile interceptors that you launch from Earth are going to hit their target - a very difficult task. "They say it's like hitting a bullet with a bullet," said NIST's Simon Kaplan.

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