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A solar powered guardian device under development at NASA is meant to push a threatening asteroid off course, and away from Earth.  It is part of a new planetary defense effort by the federal space agency against threats from asteroids, comets and other inbound objects.  (Image from NASA)

A solar powered guardian device under development at NASA is meant to push a threatening asteroid off course, and away from Earth. It is part of a new planetary defense effort by the federal space agency against threats from asteroids, comets and other inbound objects. (Image from NASA)

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