Glaciers InterStellar 2

These Prolate-Cylindrical Starships are particularly useful for thinking through our mass/momentum requirements. Today I am estimating 10-20 km radius (meaning 1/20th to 1/10th revolutions per minute for one gravity force) and a hundred km or more in length from Fore to Aft. That means when standing our heads will be pointed towards the Ships' core, where perhaps thermal heat from the Propulsion system can provide a virtual Sun. A Million families on the (multigenerational or not) Star City Cruise Ship, and Millions of Robots, tens of Millions of Microbots, etc. Most of the "Leviathan" is shielding, fuel, reaction mass, robots, tech, structure and propulsion core coils (electromagnetic). We might also assume the Leviathan's are also Fab-Ships, continuously collecting Interstellar Plasma, Dust, Water etc. and growing themselves in length and diversity of kit, subsystems, spacecraft -- and duplicating themselves! Thus models for ALL immediate-term Solar System Orbital Cycler CityStates!