> A denser rock of iron or similar might be more difficult to divert. May be, or may be not. But I think it doesn't make it impossible to divert them, even if

> A denser rock of iron or similar might be more difficult to divert. May be, or may be not. But I think it doesn't make it impossible to divert them, even if it is more difficult. The idea is to struck it in a carefully chosen moment, when small differences in delta-v can translate into huge differences in a probability of the impact with Earth. A pile-of-rubble kind of asteroids seemed the most troublesome, because when you shoot it bullets can just pass through. Or asteroid can break into a lot of pieces amplifying a probability of the impact with Earth: one of pieces can strike Earth and it is can be enough for a catastrophic consequences. But the outcome of an experiment assures us that it is not a case. A lot of small boulders fly on a lot of different trajectories, but they are small, they will burn in atmosphere if they get here. ps. I feel it is important to state that I'm not an astrophysicist or someone like this, so all written above is my own opinion that can be completely wrong.