Your planet is a heart of your might. Here is your fleets are created, resources are mined, and new technologies are developed.
There are 15 different buildings you can build on your planet. Each has its own purpose. You need polymers and metals to build these constructions. Also each building has 30 levels - to upgrade a building you will need to spend a bunch of polymers and metals too. To unlock the possibility to upgrade a building, you will need a certain level of other buildings.
The higher the building's level, the longer it takes to improve it. The upgrading process can be completed immediately for free, if there are 5 minutes or less remained. You can use accelerators too - they can be obtained as a reward for some quests, and you can purchase them for credits.