Dangers of asteroid deflection

@article{Sagan1994DangersOA,
  title={Dangers of asteroid deflection},
  author={Carl E. Sagan and Steven Jeffrey Ostro},
  journal={Nature},
  year={1994},
  volume={368},
  pages={501-501}
}
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The collision with Earth of near-Earth asteroids or comet nuclei poses a potential threat to mankind. Objects about 100 m in diameter could be diverted from an Earth-crossing trajectory by the impact
Impacts on the Earth by asteroids and comets: assessing the hazard
There is a 1-in-10,000 chance that a large (∼2-km diameter) asteroid or comet will collide with the Earth during the next century, disrupting the ecosphere and killing a large fraction of the world's