Asteroids' Oddball Shapes Make Deflecting Them Challenging
In a pinch, we could use a stand-off nuclear blast to redirect a dangerous asteroid on short notice. There's no atmospheric shock wave in space, but the x-ray pulse could still deflect the space rock. But asteroids aren't round and uniform, so their weird shapes make it difficult.
We haven't written up this one. Universe Today has the full story — the link below goes straight to it.