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Jul17-07, 06:01 PM
Sci Advisor
HW Helper
P: 8,953
You can in theory divert the asteroid to hit anything you like, the moon has a predctable orbit and so you can calculate where it will be at any future time with reasonable accuracy.

Diverting an asteroid just involves giving it a push in the right direction!
The earlier you give it the push the less force you will need to get a given degree of movement, ideally you would give it a small nudge this time round the sun so that it had moved the correct amount the next time it came round. However the period (time needed for an orbit) of such an asteroid is 1000s of years so instead you probably want your Bruce Willis team to head out toward it while it is a decent distance away but heading toward us and attach rocket moters to give it a nudge in the right direction.