[SkyDancer]

Not a problem:

I have it under control.

[RayChuang88]

Funny you posted that cartoon because it reminds me a bit of the opening scene from the first episode of the Mai-Otome Zwei anime four-episode OVA series.

But seriously, the best way to stop an asteroid is to land a small satellite with a small nuclear warhead--maybe 10 kT--on the surface of the asteroidc and detonate it while it is still far away. While the yield is low the effects of the 10 kT detonation may change the trajectory of the asteroid enough such that it will go from hitting the Earth to completely missing it.