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Government scientists now have an official plan, just in case: They’ve designed a spacecraft to hit any large oncoming asteroids with a nuclear explosion. The Hypervelocity Asteroid Mitigation Mission for Emergency Response (HAMMER) spacecraft — a collaboration between the National Nuclear Security Administration, NASA, and two Energy Department weapons labs — would either steer its 8.8-ton bulk (called an “impactor”) into a small asteroid, or carry a nuclear device to deflect a big one.