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A starbase module is an upgrade for a starbase that confers bonuses to the starbase and/or nearby ships and colonies. Some modules are specific to, or even define, the type of starbase (mining, economic, military, culture), while generic modules, such as weapon and defense modules, apply to any type of starbase.
Constructing a module is instantaneous and requires an investment in 
Credits and often one or more galactic resources. Some modules require a specific technology.