I'm creating a fantasy world (dragons, giants, generally medieval, generally rare magic, potential inter planar travel), and I would like the world shaped like a donut. Obviously I could just say "The world is magically sustained as a torus" and be done, but I want to know what magic needs to be there before getting too far into it.
Since I'm allowing inter-planar travel, I'm starting with the concept that the torus is held together by a ring in its center that contains millions of nodes that can transport to different planes/planets. The gravity from these planes leaks through causing the torus to maintain cohesion, and not form into a sphere.
Other problems I know need solved:
- What prevents the atmosphere from being ripped away?
- How do orbits of stars/moons prevent collisions?
So the question is: what handwavium/magic is needed to sustain a torus big enough that stars (could be singular if that makes more sense) and moons (several) orbit from the inside to the outside of the torus? Bonus: What other physical characteristics are reasonable for such a planet? (Tides, diameter of the donut, diameter of a slice of the donut, temperatures, weather, etc.) Double bonus: reasonable solutions to the physical issues. :)
The torus big D diameter is light minutes to light hours across.
The torus little d Diameter is probably significantly smaller than the earth because gravity is "leaking" through the magical nodes or portals.
This question is similar, but calls for a much smaller planet.
This question has some great thoughts about physical characteristics of a normal spherical planet.