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asteroid impact
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…carry out a deliberate, comprehensive survey with ample time to react if any threatening NEO is found. In contrast, however, the warning time for impact from a long-period comet might be as short as two years, requiring a different class of response.
Bibliography
National Geographic Video, Asteroids Deadly impact, 1997
K. C. Cole, The Hole in the Universe, New York 2001
Dr. E. C. Krupp, Echoes of the Ancient Skies, New York 1983
Merit Student Encyclopedia, New York 1980
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