|Screen capture of a randomly created star system.|
Once you have the system down, you can get more details on a planet by using the sci-fi world generator, which gives size, composition, atmosphere, biosphere, and civilization details, or just use the fractal world generator (creating planets without all the geophysical, biological and sociological data). Need a name for a person, place or spaceship in your game? The site also has a generator for names of characters and locations (generic, cyberpunk, and various franchises).
The website also has a number of similar creation tools for fantasy role playing games, so even if you don't see a need for this in your science fiction gaming, it might come in handy. If nothing else, it can provide a few minutes of entertainment, creating a new world for your enjoyment at the click of a button.
Hat tip: This thread at Star Ranger.