Population
Population is a unit representing how much space each ship and defense unit occupies in the Hangars/Vault/Nesting grounds which are used to park and maintain ships and defense units. Each type of ship and defense unit requires a certain amount of Population, some require more than others. If there isn’t enough Population available, ships and defense units can’t be constructed. The maximum Population on a regular (non-Team) Planet is 25 112.
At each Planet the Hangars are shared between ships and defense. If your Planet has 100 total Population, this means that the Hangars can hold ships for 100 Population and defense units for 100 Population. Usually in the Planet screens on the top-right there is an indicator displaying the occupied and the total Population, which is for ships. To see the amount of Population for the defense units, go to the defense menu at the Shipyard (for Confederation/Terteths/Noxis).
Population is increased by building and upgrading Hangar/ Vault/ Nesting grounds or by activating the Populator specialty.