Each colony starts with a single space to build a facility but can be upgraded to 6 in total. Multiple facilities of the same type increase their efficiency so its best to specialise each colony according to its planet bonus. These are the facilities that you can currently build:
I could possibly add other types of facility in the future for population, food, trade etc. but for now I would like to keep it fairly simple.
Below is the interface screen for upgrading the colony and building new facilities.
Each of the different planet types will provide a certain bonus to the colony facilities built there.
Bonuses stack with the facilities you build, so for example 6 shipyards built at a desert colony will construct ships at 450% the normal speed. Some bonuses may need to change slightly if I find them to be too powerful.
+50% Ship Supply
+50% Ship Construction Speed
+50% Ore Refinery Processing Speed
+50% Ore Refinery Capacity
+50% Research Points
The lava and gas planet types which you cant colonise have more valuable asteroid fields and generally be a dangerous place as pirate ships will often gather nearby.