A solar system is a collection of stars and planetary bodies. There are more than thousands of solar systems in each galaxy.
The size of a solar system's deep space, defined by the system transition barrier, is dynamic. A system located in a low density sector is generally larger.
Solar systems contain one, two or three stars. The primary star is at the center of the solar system. In a binary or trinary system, the secondary star orbits the primary star. In a trinary system, the tertiary star may orbit the primary or it may orbit the secondary.
Stars usually have planetary bodies orbiting them. Solar output (based on the spectral classification and magnitude of each star) determines the radius at which the habitable orbit zone may occur. In this orbit zone, worlds may be habitable. Not all solar systems contain habitable worlds. Some solar systems have no planetary bodies at all.
See also: Planetary System
Solar systems are named by players when a city is founded in it. The name of a solar system can be changed by an empire's officials if they are the only ones to have cities in the solar system.
The name of a solar system is only revealed on the star map if your empire has explored it.
Solar systems with no colonizable worlds can be named without founding a city, since no city can be founded.
It is possible for a spacecraft to travel through space directly to another solar system at lightspeed using normal propulsion, this is known as deadheading and travel time can be quite long depending on the distance between system cores. A spacecraft with an FTL drive can however travel the same distance in a fraction of the time.
The primary star may have one or more naturally occurring wormholes present around it. Wormholes connect to nearby solar systems in a loose branching network. Spacecraft use wormhole drives to travel instantly from one solar system to another through wormholes.