User blog comment:RandomGuy96/So how do planetary defense cannons work?/@comment-5379655-20130128042915/@comment-68.8.14.28-20130128150226

In that case, it wouldn't matter whether or not the ships knew that the projectiles were coming at it, they would just have to move to any slightly different position after they fired to dodge the projectiles. Simply having guns fire in a way that would maximize the chances of hitting a ship won't work; those projectiles are very small. And space is very big.

That could be an explanation, I suppose. But again, I don't know if that would actually happen on part of not really knowing anything about physics. Anyone who does care to shed some light on the situation?