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+====Nuclear propulsion solves asteroid deflection- moves them out of harmful orbit==== |
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+**Spotts, 05** (Peter N., staff writer of the Christian Science Monitor, "To steer an asteroid away from Earth, try a space 'tractor", 11/14/05, http://www.csmonitor.com/2005/1114/p02s01-usgn.html) AFL |
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+If an asteroid ever threatens AND |
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+due for retirement in five years. |
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+====The impact is extinction==== |
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+**McGUIRE 02 **(Bill, Professor of Geohazards at University College London and is one of Britain's leading volcanologists, A Guide to the End of the World, p. 159-168) |
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+The Tunguska events pale into insignificance AND |
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+wc could do little about a new comet heading in our direction. |