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 Date: 2015-01-02 14:11:59Planetary defense Space science Asteroid-impact avoidance Earth Comet Impact event Near-Earth object Asteroid NASA Astronomy Planetary science Space |
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| First Page | Document Content | |
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Date: 2015-01-02 14:11:59Planetary defense Space science Asteroid-impact avoidance Earth Comet Impact event Near-Earth object Asteroid NASA Astronomy Planetary science Space |
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