Wildspace

Wildspace is what comes to mind when we speak of "space."  It is the emptiness that lies between the planets and the stars.  All the celestial bodies with a crystal shell (see below) float in the airless void called Wildspace.  Conventional interplanetary journeys around a solar system take place within Wildspace.  It is mostly vacuum.  Wildspace is not truly a void, however, even though it is often referred to that way.  The simple fact that there is "space" rules out its being a true void.

Wildspace

Praetorian's Spelljammer The_Praetorian The_Praetorian