##Probably not.

Unlike in an atmosphere, a missile in space doesn't have to constantly burn fuel just to avoid crashing into the ground. That means you can get it "pointed" in the general direction of its target and just let it coast, giving it a potential flight time not of a few minutes or hours like that of an atmospheric missile, but of months or years, if the target is across the solar system.

Now, you don't want to just burn up all the fuel for accelerating as fast as possible right from launch. That would just leave you with a dumb projectile, which is trivial for a mobile target to dodge with months of reaction time. You want to burn enough fuel to make sure you're closing on the target, and use the rest for course adjustments en route, to counter any movements the target makes.

The less fuel your missile has to burn to set its initial course, the more it has available for corrections, and the more likely it will be able to actually get near its target.

That suggests that you want to have the missile pointed in the right direction from launch (not necessarily directly at the target - orbital mechanics are weird to those used to typical human living conditions, but I digress...), which a turret would certainly help with.

But, I suspect it would be even cheaper to just make some really tiny adjustments with reaction wheels and turn your whole ship around to aim fixed missile tubes. Feel free to take your time turning slowly (and inexpensively). Remember, it'll be a few months before your missile gets close to the target anyway.

And, if you somehow manage to sneak up on someone in space, with your bright, heat radiating ship, and are close enough that your missiles can reach their target in a matter of minutes or less, then you can probably afford to have them burn fuel maneuvering around your ship when launched from fixed tubes. At that point, though, you're also approaching the point where dumb projectiles and lasers start to become feasible (and they would certainly need turrets).

Probably not.

Unlike in an atmosphere, a missile in space doesn't have to constantly burn fuel just to avoid crashing into the ground. That means you can get it "pointed" in the general direction of its target and just let it coast, giving it a potential flight time not of a few minutes or hours like that of an atmospheric missile, but of months or years, if the target is across the solar system.

Now, you don't want to just burn up all the fuel for accelerating as fast as possible right from launch. That would just leave you with a dumb projectile, which is trivial for a mobile target to dodge with months of reaction time. You want to burn enough fuel to make sure you're closing on the target, and use the rest for course adjustments en route, to counter any movements the target makes.

The less fuel your missile has to burn to set its initial course, the more it has available for corrections, and the more likely it will be able to actually get near its target.

That suggests that you want to have the missile pointed in the right direction from launch (not necessarily directly at the target - orbital mechanics are weird to those used to typical human living conditions, but I digress...), which a turret would certainly help with.

But, I suspect it would be even cheaper to just make some really tiny adjustments with reaction wheels and turn your whole ship around to aim fixed missile tubes. Feel free to take your time turning slowly (and inexpensively). Remember, it'll be a few months before your missile gets close to the target anyway.

And, if you somehow manage to sneak up on someone in space, with your bright, heat radiating ship, and are close enough that your missiles can reach their target in a matter of minutes or less, then you can probably afford to have them burn fuel maneuvering around your ship when launched from fixed tubes. At that point, though, you're also approaching the point where dumb projectiles and lasers start to become feasible (and they would certainly need turrets).