Chrysalis: The Ambitious Plan to Send a City to Proxima Centauri
A revolutionary concept in aerospace engineering, the Chrysalis project proposes building a self-sufficient “city ship” capable of traversing interstellar space for four centuries, potentially ushering in a new era of human exploration.
The Chrysalis project recently won Project Hyperion, a competition sponsored by the Initiative for Interstellar Studies (i4is), by presenting a solution to one of humanity’s most daunting challenges: transporting a complete society to Proxima Centauri b, an exoplanet roughly 4.24 light-years—approximately 40 trillion kilometers—from Earth. Located within the habitable zone of the Alpha Centauri star system, Proxima Centauri b represents a potential new home for humanity.
The envisioned vessel is not merely a spacecraft, but a sprawling, self-contained world. Measuring 58 kilometers in length, Chrysalis would be constructed with multiple rotating layers designed to generate artificial gravity, mimicking Earth’s conditions and mitigating the physiological effects of prolonged exposure to microgravity. These layers would be functionally distinct, encompassing areas dedicated to food production, residential living, industrial activity, and even a specialized outer ring for robotic maintenance and storage.
Sustaining life for 400 years presents immense technological hurdles. The project relies on the development of commercially viable nuclear fusion reactors, alongside closed-loop systems for complete recycling of water, air, and waste. Population control is also paramount; while Chrysalis could theoretically accommodate 2,400 people, a population of around 1,500 is considered optimal to balance resource availability, energy consumption, and living space over the centuries-long journey.
This voyage would inevitably span multiple generations. As one source highlights, the initial crew would live and die within the confines of the ship, entrusting their descendants with the completion of the mission. Recognizing the profound psychological impact of such a confined existence, the project incorporates dedicated spaces for cultural activities, social interaction, artistic expression, and mental health support. The ship’s operation would be a hybrid model, with humans managing core systems and artificial intelligence providing support through resource monitoring, failure prediction, and strategic decision-making.
The most significant external threat is cosmic radiation. To combat this, Chrysalis would be equipped with reinforced armor and self-repairing materials. Emerging research suggests that innovative “smart polymers” could provide the necessary shielding for crew safety during centuries of deep-space exposure.
Preparation for such a mission would begin decades before launch. The first settlers would undergo up to 80 years of isolation in a simulated environment in Antarctica, replicating the psychological and social conditions of the interstellar voyage. This extended isolation period aims to prepare the pioneering generation for a lifetime dedicated to initiating a mission that only their descendants will ultimately finish.
Despite its theoretical nature, researchers involved in the project believe key technologies could become viable within the next two decades. If realized, Chrysalis would represent more than just a vessel; it would signify the dawn of human interstellar travel.
