Tom Kalbfus
Mongoose
I saw the movie and read the book, and here is a blank map of the Oasis, it was described as being a arranged like a Rubic's cube, which is a 3 by 3 by 3 cube, each cube is called a sector. Each sector is 10 light hours on a side. One sector is for the Star Wars Galaxy and all the planets therein, another is the Star Trek Universe, still another has Larry Niven's Known space in it including a ring world. Now I figure you can place 1000 worlds in each sector, and each would would have a sunlike star in the center and an orbital radius of 1 AU which is 150,000,000 km or about eight and a third light minutes. So a cube 7.2 au in a side with a sphere 3.6 au in radius would be enough to hold the inner solar system out to the asteroid belt. gravitational effects discontinue at the borders of each 1 light hour cube or subsector, and each Sun in the center of each cube remains stationary in relation to it, while the world in question orbits around it. That is how I would do the Oasis. The default setting is science fiction, but other setting could have magic, with D&D regions in it. Each world whatever it is takes up one small cube, and spaceships can be used to travel to most of it where technology works. There are also teleporters that can reach the no technology zones, as well as ships that operate in the magic no technology zones called Spelljammers in one instance. Each small cube has its own star field in it, it may also have a set of inner planets orbiting its particular star. Most stars are Sun sized as most worlds in the Oasis are Earth analog, meaning it has a breathable atmosphere with a 1 g environment with four seasons and a year about 365 days long. This is an artificial setting after all, so things are often arranged like this for convenience.
