I have a question regarding the Advent Mothership and how the colonize ability and the game mechanics related to it.
Lets say I jump into a system kill the 2-3 pirates and colonize the planet.  That planet then gets the 20% reduction in upgrade costs.  Then I jump into another system, wipe out a larger pirate force and my Mothership levels up and the cost reduction increases to 40%.  I then colonize the 2nd planet.  Does the first planet now get the 40% bonus or only the second and subsequent ones?  
What I'm getting at is, would a person be better off sending the Mothership around to get a level quick before colonizing asteroids to get the upgrades, or are the planet upgrade cost bonuses retroactive?