You will need Iridium and Orbit Link Kits to add connector modules and increase the station's footprint. Anno 2205 - Orbital Station - Guide/Introduction
Unlocking expansions requires you to keep an adjacent technology active for a set amount of time (ranging from 30 to 120 minutes). anno 2205 orbital station guide
Build Engineering Institutes to train Engineers . You will need Iridium and Orbit Link Kits
The station is built on a modular grid within a protective shield. anno 2205 orbital station guide