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Submission + - Earth under threat from dark comets (

An anonymous reader writes: Comets could be the most significant impact hazard to Earth, with sky surveys underestimating the number that are potentially devastating by a factor of between 10 and 100, U.K. astrophysicists say.
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Earth under threat from dark comets

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If A = B and B = C, then A = C, except where void or prohibited by law. -- Roy Santoro