Slots
From STNE Wiki
There are two types of Slots. Ship slots and colony slots.
Colony Slots:
Upon arrival at level 8, without purchase of credits, you are given a total of 6 colony slots. Four of them are used for Planets, two are used for Asteroids. With the purchase of credits, you can have up to a total of 12 colony slots, but 1/3 of the colonies HAVE to be Asteroids. Each planet/asteroid uses one (1) Colony Slot.
Ship Slots:
Upon arrival at level 8, you have a total of 100 Ship Slots. With the purchase of credits, you can have up to a total of 200 Ship Slots. Each ship has a different number of slots, from .5 slots to 25 slots.