Wildspace System

Every D&D world—whether round, flat or some other shape—exists in an airless void known as Wildspace. A world might be solitary, or it might have neighbours: one or more suns, worlds, moons, asteroids, comets, or other bodies. This neighbourhood of celestial and planetary bodies is called a Wildspace system.
In Wildspace, the Material Plane and the Astral Plane overlap. Creatures and objects in Wildspace age normally and are effective on both of those planes at once. If you were to leave your home world and continue outward until you near the edge of your Wildspace system, you would begin to see a faint, silvery haze. By travelling into this haze, you pass from Wildspace into the Astral Sea, more colourfully known as the Silver Void. The deeper into the Astral Sea you travel, the thicker and brighter the haze becomes, but the stars that shine through it are always visible. Wildspace and the Astral Sea together comprise the Astral Plane.

Type

Dimensional plane