This question was posted by Zack as a comment… I thought it was worth its own topic… so here goes:
Would it be a good idea to build colonies for a specific purpose? For example, colonies in the lower positions to be used with most fields for Mines and using satelites to power them, and a colony in the last positions for Deut? On that thought, if a defense defeats an attack, do the satelites still get destroyed? If so, powering the mining planet solely by solar satelites is a very bad idea.
Would it be a good idea to build colonies for a specific purpose?
It depends. It depends on several factors. How big is the colony in question? If it is small, it might be better to specialize in one particular resource.
I make all my planets (now that they are all 250+) mine all three resources. I have enough fields that it’s worth it to me. When I had smaller planets (less than 150) I specialised some. I always had Deuterium Plants, but I did either Crystal or Metal. If you don’t put at least a low level Deuterium Plant, then you have to shop in any Deuterium before you can ship out your resources.
If a defense defeats an attack, do the satelites still get destroyed?
Yes… Solar Satellites will be one of the first things destroyed… even if you have large defenses. Every attacking ship has Rapid Fire against Solar Satellites. So they usually end up as space dust (er… part of the debris fields) pretty quick.