Researchers have outlined a plan to send humans to a star system beyond the solar system aboard a 58‑kilometre long spacecraft named Chrysalis, designed to sustain life for centuries. The project, referred to as Hyperion, envisions carrying roughly 1,000 people on a journey lasting approximately 400 years, during which multiple generations would live and die aboard the ship.

Unlike missions to the Moon or Mars, which remain within the solar system and achievable in decades, this plan addresses travel to an exoplanet, specifically Proxima Centauri b, located in the Alpha Centauri system. The planet’s habitability is not confirmed, but it represents the nearest potential destination for a long-duration interstellar voyage.

A spacecraft for multiple generations

The Chrysalis design imagines a ship long enough to accommodate extensive living areas, agricultural zones and life support systems necessary for centuries of human habitation. Its length of 58 kilometres is intended to allow for artificial gravity, achieved through rotation, which would mitigate health problems associated with long-term weightlessness. 

The ship would be largely self-sufficient, with systems to recycle water and air, as well as to produce food for all onboard. These systems would need to operate reliably across multiple human generations. The design incorporates areas for habitation, work, and recreation, recognising the importance of maintaining daily routines and social structures over centuries.

Origins in the Project Hyperion Design Competition

Chrysalis was developed as part of the Project Hyperion Design Competition, an international effort to explore designs for long-duration interstellar travel. Participants included engineers, architects and social scientists, who examined both technical and social aspects of extended human presence in space.

The competition emphasised practical constraints, including propulsion, life support, structural integrity and population management. Chrysalis stood out for its scale and for detailing how human life could be supported across centuries without returning to Earth. Although it is a theoretical plan, the design provides a framework for future research into interstellar voyages. 

Technical requirements

A ship capable of supporting 1,000 people for 400 years requires systems that have not yet been built. Key requirements include artificial gravity, reliable propulsion, closed ecological life support, and redundancy in critical systems. The design anticipates areas for food production, water recycling, air purification and waste management. Maintaining these systems is critical, as failure of any could jeopardise the long-term viability of the crew.

In addition, energy systems would need to provide continuous power for centuries. Concepts for such energy include nuclear reactors or other long-duration power sources capable of operating with minimal maintenance. 

Social organisation and population management

Managing a multi-generational population in a closed environment is a significant challenge. Chrysalis plans assume structured governance, resource allocation, education, and healthcare systems. Ensuring that knowledge and technical skills are passed to new generations would be critical to maintain ship operations.

Population size and reproduction rates would need careful management to prevent overpopulation or resource shortages. The design incorporates communal and private areas to support daily life and social cohesion over centuries.

Challenges and limitations

The plan highlights technical and social obstacles. Current technology does not yet allow construction of a 58‑kilometre spacecraft or reliable life support for multiple generations. Propulsion to reach even a fraction of light speed remains theoretical. The psychological effects of living for generations in an enclosed environment are largely unknown.

Despite these challenges, Chrysalis provides a detailed roadmap for what a future interstellar mission could require, including the size, infrastructure, population, and support systems necessary for long-term survival. 

A vision for the future of human space travel

While Chrysalis remains a long-term plan rather than an active programme, it demonstrates the scale of planning required for human interstellar travel. By examining both technical and social considerations, the project provides a framework for future researchers and engineers to explore the feasibility of sending humans beyond the solar system.

The plan emphasises that reaching another star is possible in principle, but it will require advances in engineering, life support, propulsion and human factors. Chrysalis offers a reference point for future exploration of what is needed for humans to live and travel safely in space for centuries.