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In Star Wars movie, Luke blow up the death star by flying really close to the surface at high speed and shooting a missile straight down.
From what I understand it has to be at 45° before the top of the hole to shoot, like this:
<=L=>mm m m m ----------|m|--------------- |m| |m|
Where m is the trajectory used by the missile.
Is there any explanation on how can the missile turn in such a steep way, and why couldn't it be fired from somewhere else, since the missiles seems to have extra high maneuverability ?