Rhydin Is a Pocket Dimension and Universe

Rhydin is a nexus dimension. The nexus dimension. An extension of the Nexus—the Infinite Primordial. A pocket of order.

It is a pocket universe. Its edge is the heliosphere. To go beyond is to leave the dimension. There are permanent portals to elsewheres out at the edge. Starships that utilize jump drives, warp drives, or overdrives create their own portals to whatever home dimensions their science is from.