Although rare, it is also possible for planets to have a single satellite (a moon), which is created by huge battles in which a lot of resources are involved.
New players are spawned starting from galaxy 1, system 1 and going to galaxy 1, system 600, with usually 9 home planets being created per system, after that it repeats with every following galaxy.
When population of a server hits an unknown amount, new galaxies are created in a batch of 5, currently there is no known limit to how many galaxies can exist, there are servers with 50 galaxies however. A galaxy consists of 19 planets of which 3 are Pirate Planets of levels 5, 10 and 15.
Star Systems are common in each galaxy and every galaxy contains over 100 star system that hold 6 Neutral Planets and 3 pirate planets.
Traveling inside a star system takes the lowest amount of time, traveling between star systems more and traveling to a neighboring galaxy the most. Travel time increases with the star systems and galaxies that have to be crossed (judging by coordinates).
To save a coordinate for fast usage in your bookmark list, there is an option on every colonized planet available, not on pirate planets though. On this topic see also: Account.