There are a whole range of options, if we have enough warning and invest in the technology[1]. My personal favourite is the gravity tractor: > One more alterna

There are a whole range of options, if we have enough warning and invest in the technology[1]. My personal favourite is the gravity tractor: > One more alternative to explosive deflection is to move the asteroid slowly over a time. Tiny constant thrust accumulates to deviate an object sufficiently from its predicted course. Edward T. Lu and Stanley G. Love have proposed using a large heavy unmanned spacecraft hovering over an asteroid to gravitationally pull the latter into a non-threatening orbit. And the same technology could be used to actively "capture" asteroids for fun and profit [1] https://en.wikipedia.org/wiki/Asteroid_impact_avoidance https://en.wikipedia.org/wiki/Asteroid_impact_avoidance