In another thread, there were some good replies to explain how Planetary Defense and Omega defense management work. One further question if I may, when you build these, do you have to click on a tile thus using up one of your buildable tiles and losing the production of a factory or research center on that tile? If you have a Class 7 planet would you have to give up two of the seven buildable tiles if you wanted to have the two defense systems?
Thanks for your replies.