There are so many! Do they all have a system of planets?"
Most of them."
Has anyone been to them all?"
Not likely."
I want to be the first one to see them all.
Anakin Skywalker and Jedi Master Qui-Gon Jinn, looking at the stars[src]
Star system hologram

Star Systems, also known as a planetary systems or simply a system, were a group of bodies orbiting a Star. Star Systems usually consisted of one or more Planets, and the debris remaining from the formation of the primary planets and central star, such as comets and asteroids.

There were 7,100,000,000 stars in the known galaxy, with approximately 3,200,000,000 habitable star systems. Only about a billion of these systems have life. Only 69,000,000 of those systems meet population requirements for Imperial representation. All star systems are given coordinates that are used by navicomputers to permit space travel. To fly from the center of star system to its further limits in sublight travel, it took from 12 to 72 hours, depending on the size of said system and the potential obstacles along the way.

The galactic standard approach to naming star systems was to base the name off the central star or planet. However, some systems were unnamed, and were only known by a numerical designation.