I was reading the yahoo news and some Russian woman is sueing Nasa for several millions dollars because she said they messed up her horoscope when the crashed into the meteor.

The projectile that was shot towards the comet has the mass ratio comparable to that of a fly hitting a commercial passenger jet.

Unless you think the fly can knock off a plane from the sky, you shouldn't worry about the comet being affected by the impact.

You know, I could be an ass and calculate it all out, but it's easier to say that the comit wouldn't effect the Earth's orbit without proof. Just take my word on it. If something did hit, it'd have to be pretty massive to actually cause a dent in our way of life. A comit the size of a state or country would do that, could cause a nuclear winter even. (the impact creates dust clouds which cycle up in the air and obstruct sun flow, this, if I'm not mistaken, in bad cases, lasts thousands of years, if not more)

The Earth's orbit changes all the time anyway, just to let you know. It's small changes, but it changes nonetheless. I think there's some other thing like, the poles switching position, that'd cause more worry then a comit wiping out life. Even if there was a huge world annihilating comit that killed the dinosaurs, it didn't kill everything, since there's still life that is similiar to what we've found in fossils.

But, I could be wrong, I mean, no one actually knows, it's all just hypothesis'.