It's never happened before that we've fired a very largebullet that's made largely of copper and aluminum, the size of a washing machine, at a comet that's about--the comet's nucleus is about four or five miles across--to make a big crater.
The bullet to bite is so large that we're more willing to dribble out the price of sending out repair crews, and to put up with the far more substantial costs borne by individuals and businesses that go without power for hours, days and sometimes weeks.