najaB,<br /><br />For some reason, the first thing that popped into my my mind when I read that news item was "What if they alter the asteroids trajectory so that it is on a collision course with Earth?" Then I remembered that it is the ESA, not NASA doing this mission, and relaxed. (just kidding!) I still wonder if the asteroid will shatter when the impactor hits. <div class="Discussion_UserSignature"> The secret to peace of mind is a short attention span. </div>