A space depot was a small depot located in within every sector. Ratchet could land Aphelion there and he could talk to a Vullard dealer. The dealer could upgrade his ship or give him space quests. The space quests were to be performed in the moon group that the depot was located in. Each depot also had two GrummelNet vendors, one for weapons and the other for armor. It was essentially an inter-galactic service station placed on a small chunk of floating rock.