The trajectory of this comet makes things especially difficult. It is moving fast, travelling in the opposite direction of all the planets and is coming in at a

The trajectory of this comet makes things especially difficult. It is moving fast, travelling in the opposite direction of all the planets and is coming in at a large angle relative to the plane of the solar system. From Phil Plait's post it will be moving at over 55km/s relative to Mars during the flyby/impact. Simply intercepting this comet is basically impossible today.