Chrysalis: A 1,000-Person, 250-Year Interstellar Ark

Chrysalis envisions a 36-mile rotating generational spacecraft designed to carry 1,000 people for about 250 years to a neighboring star, treating the vessel as a permanent settlement with a self-contained biosphere, artificial gravity, extensive radiation shielding (notably water), vertical farming, and closed-loop life support. Built as an in-space, Earth–Moon L1 hub assembly project, it combines biology, engineering, and governance to sustain generations, with autonomous robots and potential nuclear-thermal propulsion for propulsion and maintenance.