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'we'
Presently, NASA's plan is send a spacecraft out to any Earth-intercept asteroid and give it enough of a nudged force vector, to deflect its trajectory away from us.
NASA's already successfully landed spacecraft on asteroids. A small, impulse rocket motor, operating over a long-enough duration, could do the job.
Not 'sexy', but it'd get it done.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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