Introduction Roverdude's Modular Kolonization Systems (MKS) suite of mods ( https://umbraspaceindustries.github.io/UmbraSpaceIndustries/ ) allow colonisation of other planets and moons.  They can be supplemented with Planetary Base Systems ( https://www.curseforge.com/kerbal/ksp-mods/kerbal-planetary-base-systems ) and Extra Planetary Launchpads (EPL) ( https://forum.kerbalspaceprogram.com/index.php?/topic/54284-18-110-extraplanetary-launchpads-v681/ ) which I assume you have installed for