Fields

Fields are the amount of space a planet has to build upon. You can continue building on any planet until you have used up all fields.

Your home world starts with 163 fields, but colonies get a random number. More fields are always better. You will usually find more fields on planets 4 through 10.

Fields are used whenever a building is built or increased in level. One field slot is used per level, so a level 3 Shipyard would consume 3 fields. Defenses do not use up field slots.

Note: You can free up fields by tearing down (or reducing the level of) your buildings. Go to the buildings menu, and click the building name and this bring up a window. You do not recover resources spent, but in fact spend resources to tear it down (and time).