Asteroid 2012 DA14, speeding toward a record close approach to the Earth next week, poses no apparent danger to humans or orbiting satellites and will likely depart on a course-altering trajectory that should not bring it this way again, according to experts preparing for the encounter. Nonetheless, the attention-grabbing episode promises to serve as a reminder of a larger threat the world’s space powers are just beginning to size up. The approximately 180-ft.-long 2012 DA14 is ...


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