The Galaxy (Earth-2356)

"Kid, I've flown from one side of this galaxy to the other. I've seen a lot of strange stuff..."

- Han Solo, to Luke Skywalker

The Galaxy, as it is commonly referred to, is one of the trillions of galaxies in the universe. The galaxy is a vast composite of over 400 billion estimated stars and over 3.2 million habitable systems orbiting around a super-massive black hole at the heart of the galaxy. The galactic arms rotate around this black hole across a diameter of over 100,000 light-years. It is home to countless sentient species and star systems.

The galaxy serve as the setting for trade, politics, and war throughout galactic history. In historical memory, the galaxy would see the successive eras of the Galactic Republic, Galactic Empire, New Republic, among others, and is home to the Force-using orders of the Jedi and Sith.

Source

 * https://starwars.fandom.com/wiki/The_galaxy.