Sanoora world ship

The Sanoora world ship was a class of multi-generation ships launched from Nraka 500,000 years ago.

History
500,000 years ago, Sanoora scientists discovered that radiation from a rogue star would destroy their civilization, but they had a few centuries to prepare. Many massive, multi-generation ships were built, each a city in space, to save the populace. They were set on an orbit that would return them to their homeworld once radiation had subsided. One city ship returned to Nraka in 2266, but by then descendants of those who remained had reclaimed the surface and built their own society. The Sanoora tried ousting them, but the Nrakans refused and turned back a planetary assault with the help of the USS Enterprise (NCC-1701). The Sanoora ship’s population eventually settled on another planet. 

Overview
The vessels had a forward section, massive engineering section, and spherical middle. Within the sphere, a cylinder ran through the middle. The interior surface of the sphere was a city with buildings and landscape features such as rivers. It was unclear if the sphere spun to create gravity or if artificial gravity generators were used.

The vessels were armed with at least 10 beam weapon turrets, some along the sphere’s surface and at least one on the forward section.

The ship was estimated at “several miles in diameter” and was said to be “six square miles” in size.


 * The latter measurement could not have described the surface area within the sphere, as that would give it a diameter of only 1.38 miles. Instead, it most likely meant that the volume of the sphere was six cubic miles. That equates to 16 square miles of spherical surface area and a diameter of 2.25 miles. Sphere calculator

The engines appeared nearly as long as the sphere’s radius, about 1 mile, and the forward section was of an unknown length, resulting in a total length of about 3.3 miles. Its diameter makes it about twice the size of the Fesarius.

The Sanoora world ships were placed in a 500,000 year-long orbit around Nraka, suggesting neither intent nor ability to travel to a different star system. However, at least one of the world ships was able to travel to another system in 2266, so it may have had or developed some sort of faster-than-light drive.