Rocket turret

Overview
The rocket turret is a powerful defensive building capable of firing any rocket ammo at high range. It is unlocked with agricultural science packs which can be crafted on 

When firing capture bot rockets, a rocket turret will exclusively target biter and spitter spawners, overriding any target priorities it may have. However, if a rocket turret empty on ammo is targeting a non-spawner enemy when it is loaded with capture rockets, then its first shot will fire on that enemy, wasting the capture bot rocket.
To one-shot big asteroids (except for promethium asteroids) with standard rockets, stronger explosives (research) level 23 is required.