The Twin-Section Hypothesis is a scientific theory formulated in 2626 during the Beta Age by geographers, climatologists, and ecologists of the Last Frontier University — the predecessor of the Danah-Wanah-University in the Gamma Age.

Among the leading minds behind the hypothesis was Professor Joan Merkenberg, a geographer who played a pivotal role in its development and confirmation.

The hypothesis proposes that each South Midbelt, North Midbelt and Equatorial Section of the Habitual Belt has a mirrored twin region on the opposite hemisphere of VOI 700 D, sharing similar climatic, ecological, and geographical characteristics due to the planet’s tidal lock and symmetrical land distribution.

Without access to advanced planetary mapping technology, the Twin-Section Hypothesis was developed through direct observation, comparative environmental studies, and empirical reasoning by Exohuman scientists. They theorized that identical conditions might exist in corresponding regions on the Western Habitual Belt.

To test this hypothesis, the Westward Passage Expedition (2626–2628) was launched — an ambitious overland journey from Asari (Eastern Equatorial Section) to its theorized counterpart, Zilari (Western Equatorial Section). The expedition successfully confirmed the hypothesis, revealing that Zilari's climate, ecosystems, and terrain closely resembled those of Asari, supporting the theory that each section had a twin with similar environmental features.

As the expedition also traversed the North Midbelt, it found no contradictions to the hypothesis, further strengthening its validity. However, these regions were only superficially documented, as the expedition was focused on reaching Zilari rather than conducting in-depth research.

Despite the success of the Westward Passage Expedition, the hypothesis remains partially validated, as Zedari (Western South Midbelt Section) remains completely unexplored. Furthermore, while the hypothesis provides a broad framework for planetary geography, minor deviations — such as localized geological formations, river systems, and unique species distributions — highlight that no two regions are exact copies.

With the signing of the Peace Treaty in 2631, all Exohuman territorial expansion and exploration beyond designated settlements were strictly prohibited. As a result, no further scientific expeditions have been conducted, leaving many twin regions unverified and some areas — such as Zedari— as complete terra incognita.

The Twin-Section Hypothesis remains a foundational concept in Exohuman planetary science, shaping scientific understanding of VOI 700 D’s Habitual Belt. However, it is now a theory frozen in time, with no foreseeable advancements due to political restrictions. The Danah-Wanah-University, successor to the Last Frontier University, continues to analyze pre-2631 data but lacks the ability to conduct new field research under the current regulations of the Federal Confederation.

• Beta Age
• Habitual Belt
• South Midbelt Sections of the Habitual Belt
• Equatorial Sections of the Habitual Belt
• North Midbelt Sections of the Habitual Belt
• Last Frontier University
• Westward Passage Expedition