Leave Earth — Centrifugal Gravity Vessels

The hull is 7.5 meters of ultra-strong steel. The ship is 100 kilometers long and 8 kilometers in diameter, a rotating drum that generates artificial gravity. The inner ecology layer is 20 meters thick, with mountains and water, enough to sustain long-term life in space. In normal operation the fleet rests at the Earth–Moon L4 and L5 Lagrange points, quietly waiting for helium-3 fuel to be collected. When fuel is ready, part of the fleet will depart on the long voyage — carrying human civilization beyond the solar system; the rest will remain in the system to serve those who stay home. They stand for freedom, and for the future of humanity among the stars. This is — 「Leave Earth · Leaving Earth」 The Orbivi centrifugal-gravity fleet series.