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NASA says greater risk of asteroid impact

The risk of a space rock hitting earth is six times greater than previously thought, according to NASA. Paul Chodas tracks asteroids for NASA and explains what is known about them ... More The risk of a space rock hitting earth is six times greater than previously thought, according to NASA. Paul Chodas tracks asteroids for NASA and explains what is known about them and how prepared we are for them. John Blackstone reports. Less

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