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An '''ohnyl colony''' was a type of ancient [[human]] generation spaceship design used before they mastered the forces of gravity. These are They were cylindrical ships , several kilometres in length and width , that houses housed life on the inner surface of these the bottle-shaped generation ships' hulls. They slowly rotated around their own axis, so that the centrifugal force on the inside was equal to the gravity on [[Terra]].{{Fn|1}}

The cylinder ships of the [[Jorgall]] [[alien]]s race used the same design principles in their generations generation ships, as noted by those encountered during the [[Great Crusade]] forces in [[M30]].{{Fn|1}}

*The 'ohnyl colony' ships are a distorted name referencing the concept of [[Wikipedia:O'Neill cylinder|O'Neill cylindercylinders]]s. This concept for space colonisation vessels was proposed by the American physicist [[Wikipedia:Gerard K. O'Neill|Gerard K. O'Neill]] in his 1976 book ''[[Wikipedia:The High Frontier: Human Colonies in Space|The High Frontier: Human Colonies in Space]]''. The spacecraft spacecrafts' design and simulation of gravity through the use of centrifugal force subsequently became a popular staple in science fiction media.

*It is likely that these 'ohnyl cylinders' were the conventional sub-light spacecraft used to colonise nearby star systems during the [[Age of Terra]] or early [[Dark Age of Technology]]. Generations of people would live and die onboard the ships, while they crossed the gulf between the stars. Once [[grav-plate]]s were invented and implemented on [[voidship]]s, the rotating cylinder designs of the onyl ohnyl colony ship were likely considered obsolete for use during humanity's [[Long March]] era of space colonisation.