Polar Worlds

Polar worlds tend to have large uninhabitable bands about their equators with much more temperate zones close to either pole. The large zone often prevents animals and civilizations from crossing on the macro scale without the advent of significant technologies. These worlds tend to undergo interchanges when species or civilizations from one pole reach the other, nearly always resulting in mass extinctions. In rare cases, life can evolve independently at either pole to such an extent that they share no common ancestry; Exegesis II, for instance, evolved a dextro amino acid ecosystem on its north pole and a levo amino acid ecosystem in the south.

Ribbon Worlds

In contrast to polar worlds, ribbon worlds have a narrow habitable band around their equators and large inhospitable areas dominating either hemisphere. This has a tendency to produce civilizations and fauna that engage in fierce competition for limited space and resources, often preventing the emergence of complex technological societies since many of their planets’ resources are locked beneath ice caps or the like. Occasionally, large impassible features like oceans will divide up a ribbon world in a manner similar to standard terrestrial worlds, and the resulting crucibles of evolution are responsible for many of the most virulent interstellar pests.

Twilight Worlds

Exceptionally rare, twilight worlds are always tidally locked to a larger partner, the result being that one side is extremely hot and the other extremely cold. This can, at times, create an area of “twilight,” sometimes only a few kilometers wide, where the temperature and conditions are suitable for life. Since the “twilight” must follow a line of latitude and often pass through the poles, its habitable areas are often too small for the evolution of complex organisms. This makes them highly desirable as potential colonies, as there are only a few examples of complex native life to displace.

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