Shadows of a Fallen World
The Material Plane
The Material Plane is the reality in which the world of Golarion finds itself, along with its sun and its 10 sister planets. The solar system in which Golarion exists is vast and yet just a tiny part of the infinite Material Plane. It is an unending void, occasionally harboring life on terrestrial planets or other less-stable celestial bodies.
Magical gates created long ago by lost civilizations are said to connect Golarion to its sister planets.
The Shadow Plane is the pale reflection of the Material Plane.