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The Planes
The Planes, (or the Great Beyond or the Multiverse) are unimaginably vast and varied. While a topic so broad means that much about the planes is unknown, that which is known is presented below.
The Solar System of Golarion
The SunAballon, the HorseCastrovel, the Green PlanetGolarion, the ChildAkiton, the Red PlanetVerces, the LineThe DiasporaEox, the Dead PlanetTriaxus, the WandererLiavara, the DreamerBretheda, the CradleApostae, the MessengerAucturn, the StrangerSolar system.jpg
Click on a feature to learn more.
Material Plane
The Material Plane is infinite in nature or is at least effectively infinite for the majority of its known inhabitants. The majority of the volume of the Material Plane is believed to the be the void known as the Dark Tapestry while the remainder of the known volume consists of stars, planets, and other material bodies such as comets, asteroids, and meteors.

Material Plane discusses the nature of the Material Plane and its relationship with other planes.

More information about the Material plane and its elements:

Planes of the multiverse are effectively infinite. Indeed, many planes have layers which are also infinite. They are grouped to simplify our understanding of how they relate to one another.

The Great Beyond attempts to discuss the relationships between the planes of the Inner Sphere, the Transitive planes, and those of the Outer Sphere.

More information about types or groups of planes can be found here:

Demiplanes are finite. Most demiplanes are created by powerful magic and often temporary—they are sometimes made permanent by further magical processes—though they may also be created by natural processes.
Demiplane discusses the nature and properties of demiplanes.

More information about some of the notable demiplanes can be found here: