&gt; We&#x27;re already able to send probes to Pluto within a few kilometers, calculating an asteroid&#x27;s orbit is well within our capabilities.<p>Yeah calculating the orbits and movements for a simple small mass might be fairly easy. But an asteroid is irregulary shaped which makes stuff quite complex. We have failed with Philae for example...<p>The only way this is going to work is with a powerful nuclear bomb mounted on an interstellar rocket to blow said astroid to pieces (and these pieces should be tiny enough to vanish during atmospheric reentry), should the need arise - however the EMP would fry at least the satellites in orbit, maybe also on the ground.