|This page is a Beyond the Wall alternative universe article and is therefore not part of the TEP Evolved canon.
Urth is a cylinder of infinite length located at what experts believe is the center of the universe. Several spherical celestial bodies are orbiting the Urth, most of which are only visible from the section they're alligned with. Urth’s climate is heated by the sun. The heat and light generated by the sun are strongest at the Aequator and weaken as one approaches the “poles.” Using the traditional system of latitude and longitude, beginning at approximately 66 degrees North and 66 degrees South, it becomes cold enough for the formation of ice sheets.
The light from other stars is refracted and obscured by the height and thickness of the ice walls, which results in them being effectively undetectable from “our” section.
Rotantica is the section of the cylinder immediately north of Aequatoria. It's climate is significantly warmer and more humid than the two other sections. While plant life in Rotantica appears largely similar to that of Aequatorica, animal life is somewhat different in that the dominant class of animal is reptilian rather than mammalian. Reptilian megafauna, colloquially known as “dinosaurs,” are common on all continents of Rotantica. These species appear similar to, but not identical to, dinosaurs that existed in the past in Aequatorica.
Aequatorica is the home of all currently known intelligent and sapient life. All of Homesian history before 1961, when Morstaybishlia sent a man into space, has occured in this section.
Sempiternica is the most different of the three sections that have been observed. Plant life in Sempiternica lacks chlorophyll as an energy-producing cellular compound and instead uses a pigment called retinal, which is purple. The sun in orbit of Sempiternica is significantly (40%-50%) weaker than Tep and the Rotantican sun (sometimes called Sola, from the Impelanzan sol) and therefore there is more ice, and less liquid water, in Sempiternica. Nearly all observed animal species are bioluminescent in some fashion, and most rely on senses other than sight.
Unlike Rotantica, no person has yet to be sent to this sections. Current findings are based on unmanned probes and scientific theories. While Rotantica is seemingly more suitable for Homesian life than Sempiternica, the fact that the former was colonised is purely coincidental.