NASA, the U.S. Energy Department and other agencies are moving beyond searching the sky for killer asteroids to finding a way to deflect them from Earth, with a new “planetary defense officer” to coordinate the work. Early studies underway in the U.S. and Europe could lead to a 2022 test of how much a kinetic slug could deflect a small space rock that would cause major damage if it penetrated Earth’s atmosphere. And specialists at the U.S. National Nuclear Security ...

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