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This topic is available for NewMars members who might wish to collect links, images and text about a slow flight to Alpha Centauri.
This ship would carry 2400 passengers and crew for 400 years at 10% c
Propulsion would be achieved using a fusion drive, for which an animated video is provided.
Reproduction would be managed, as would the entire flight.
The lead off post #3 will contain text from an article published in August of 2025 by Futurism.
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This post is reserved for an index to posts that may be contributed by NewMars members:
Index:
Post #3: opening article on Chrysalis 2400 passenger star voyage
Post #5: Video showing animation of fusion drive
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https://www.yahoo.com/tech/science/arti … 53247.html
Futurism
Scientists Design Huge Spacecraft That Could Carry 2,400 Colonists to Alpha Centauri
Victor Tangermann
Mon, August 11, 2025 at 4:11 PM EDTA team of engineers has come up with designs of a 36-mile spacecraft, dubbed Chrysalis, designed to carry up to 2,400 passengers to Alpha Centauri, the closest star system to our own.
As first spotted by Live Science, the ambitious vision recently won the team the top prize at the Project Hyperion Design Competition, which was launched last year by an international consortium of scientists, engineers, and urban planners.
Unsurprisingly, Chrysalis sounds like it was yanked straight out of a sci-fi novel. The hypothetical habitat generates Earth-like gravity by constantly rotating around its own axis, as laid out in a project brief. Several onion-like layers include dwellings and gardens for inhabitants, warehouses, food production and ecosystems, and communal spaces.
Each of these shells is powered by nuclear fusion reactors — which, it's fair to point out, is tech that hasn't been yet been made practical by anybody here on Earth.
Chrysalis is made up of several stages, each of which is a "fully autonomous and complete" habitat.
The layer closest to the core was designed to provide space for plants, microbes, livestock, and other mechanisms of food production. Various environments allow biodiversity to continue, including tropical and boreal forests.
The second layer houses communal spaces, and the third holds "3D-printed dwelling modules." The outermost shell serves as a warehouse for machinery, equipment, and other types of resources.
A "Cosmos Dome," 426 feet in height and 1,180 feet in diameter, provides a controlled, zero-gravity environment, as well as thermal insulation and shielding from deep space radiation.
It's also the only place where inhabitants can gaze at the universe outside, while freely and safely floating around in weightlessness.
"Through the transparent panels of the dome, the inhabitants will be able to observe the universe to the rear of the spaceship," the brief reads.
Since Chrysalis is a generational ship, the goal is to give both male and female inhabitants a three-year window between the ages of 28 and 31 to reproduce. There's a two-child limit for each inhabitant, "not necessarily with the same partner," according to the brief.
The goal is to maintain a "stable population" of roughly 1,500 individuals over three generations.
An artificial intelligence would allow for "resilience of the whole social system, better knowledge transfer between the different generations of inhabitants and a deeper vision of the overall dynamics of the Chrysalis spaceship complex," the pitch reads.
While it's a fascinating and detailed vision of an exciting, multi-generational journey to a different star system, Chrysalis is still firmly in the realm of science fiction.
Beyond the pesky issue of nuclear fusion not yet existing in a practical form, the manufacturing processes required to build a tens-of-miles structure in zero gravity far surpass anything humanity has accomplished yet. We haven't even fully explored the concept of artificial gravity with the help of a centrifuge.
But that doesn't mean we shouldn't explore the concept — especially in the face of various potential disasters that could threaten humanity's future on Earth.
More on generational ships: Researchers Plotting Giant Spaceship That Could Carry Generations of Humans
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I asked Google about Chrysalis..
AI Overview
Space ark will travel to Alpha Centauri for 400 years
The Chrysalis starship is a concept for a massive, multigenerational spacecraft designed to carry 2,400 people on a 400-year journey to Proxima Centauri b. It was the winning design in the Project Hyperion Design Competition, which challenged participants to create a realistic interstellar ark using current or near-future technology. The Chrysalis is envisioned as a self-sufficient habitat, with layers of rotating cylinders providing artificial gravity and various functions like resource management, manufacturing, and living spaces.
This video provides an overview of the biggest spaceships in fiction:
and ....
Here's a more detailed look at the Chrysalis:
Interstellar Journey:
The primary goal of the Chrysalis is to reach Proxima Centauri b, a potentially habitable planet in the Proxima Centauri system.Multigenerational Living:
The voyage will take approximately 400 years, requiring the ship to be a self-sustaining habitat for multiple generations.
Rotating Cylinders:
The core of the design features rotating cylinders that generate artificial gravity, mimicking Earth's conditions.
Modular Structure:
The ship is designed with a modular, layered structure, with each layer serving a specific purpose like resource management, manufacturing, or living quarters.
Habitability:
The design includes features like hydroponic farms, recreational areas, and community spaces to support the psychological and physical well-being of the inhabitants.
Advanced Technologies:
The concept incorporates advanced technologies like radiation shielding, in-space manufacturing capabilities, and robotic systems for resource management.
Psychological Preparation:
The design also includes a thorough psychological screening and preparation process for the crew, recognizing the unique challenges of interstellar travel and long-term isolation.
Sociocracy:
The design incorporates a "sociocracy" model for decision-making, emphasizing collaboration and community involvement.The Chrysalis represents a significant step in thinking about interstellar travel, combining innovative engineering with a deep understanding of the human and social aspects of such a monumental undertaking.
and ...
https://www.projecthyperion.org/
Team
Fatemeh Mosavi, Nafise Etemadi Idgahi, Saeed Vahdani, Negar Radfar, Elham Yousefi, Ahmad Eltaf Zhian, Mobina Fallah Gavareshk, Fatemeh Barzegar, Negar Ahmadpour, Ali Seddighi, Mahdieh Hosseinpour
Jury feedbackThis submission offers an interesting and ambitious design, with modularity as a core concept—an approach that generally supports flexibility and resilience. It stands out as one of the most integrated proposals seen so far, demonstrating strength across architecture, engineering, and social systems, and embodying the spirit of envisioning a generation ship that balances speculative vision with system-level coherence. The DNA-shaped vessel and the arrangement of globular habitats linked in a spiral pattern are visually and conceptually intriguing. The pressure vessel design is solid, and the artificial gravity approach appears generally sound, though some visual elements—such as people walking on the zero-g core cylinder walls—may overstate the effective gravity in those areas. The abundance of AI-generated images contributes to a striking but somewhat disjointed presentation; many visuals lack clear correspondence to detailed drawings. The mission control center design also feels somewhat unconventional, with its wide floor facing a circular windshield, which may merit further reconsideration. Overall, the submission impresses with its ambitious scope and integration. It may benefit from clearer technical documentation and tighter alignment between visuals and engineering details.
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Here's a bit more detail. Apparently there is a video that might be available to illustrate the concept.
https://www.youtube.com/watch?v=OKJKEQqcjAo
This animation shows how the fusion drive might work.
I asked Gemini to dive into the Internet to see what it could find:
Conversation with Gemini
Chrysalis flight plan - Hi Gemini! Thank you for all the assistance you have provided for numerous requests. This one is just a look up request, so I'm hoping it will be easier than some. Chrysalis is a design concept for a 400 (Earthyear) journey to Alpha Centauri. It quick summary i have seen so far does not include details about how the vessel would be accelerated the start of the journey or decelerated at the end. I wonder if you might have access to resources to answer those questions?
The Chrysalis spacecraft, a conceptual design for a 400-year journey to Alpha Centauri, is intended to use a Direct Fusion Drive propulsion system. This system would be fueled by helium-3 ( 3 He) and deuterium ( 2 H), and would be used for both acceleration at the beginning of the journey and deceleration at the end.
Propulsion System and Mission Profile
The Direct Fusion Drive (DFD) system would generate a continuous acceleration of 0.1 g (0.98m/s 2 ), allowing the spacecraft to reach approximately 10% of the speed of light (0.1 c). The mission plan includes a year-long period of acceleration at the start of the journey and another year for deceleration as the spacecraft approaches the Proxima b planet in the Alpha Centauri system. The rest of the 400-year journey would be spent in a coasting phase.The DFD system is a theoretical concept that, if developed, could generate both the necessary thrust and electrical power for the long journey. Chrysalis is a design concept that won the Project Hyperion Design Competition, which asked for a realistic multi-generational ship using current or near-future technology. The designers chose a simple, cylindrical shape to minimize structural stresses during the acceleration and deceleration phases.
This video discusses the challenges of interstellar travel and mentions the Breakthrough Starshot initiative, which is another project aimed at reaching Alpha Centauri.
The 10% c helps to explain the 400 year journey time.
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Someone somewhere decided to put this topic back up on the Internet ...
https://www.yahoo.com/tech/science/arti … 13016.html
A 36-Mile Spacecraft Could Carry 2,400 People to the Nearest Star On A 400 Year Journey
Al Landes
Mon, October 26, 2026 at 2:34 PM EDTA 36-Mile Spacecraft Could Carry 2,400 People to the Nearest Star On A 400 Year Journey
Chrysalis could house several generations until it enters Alpha Centauri, where it could shuttle people to the surface of the planet Proxima Centuri b. (Image credit: Giacomo Infelise, Veronica Magli, Guido Sbrogio', Nevenka Martinello and Federica Chiara Serpe)A spacecraft 58 kilometers long, carrying up to 2,400 people, traveling one way toward a star roughly 4.24 light-years away: that is the premise of Chrysalis, the winning entry in the Project Hyperion Design Competition run by the Initiative for Interstellar Studies. No publicly documented funding or approved construction program exists, and the concept depends on propulsion technology that does not yet exist. What it does have is arguably more useful: a serious, integrated attempt to treat interstellar travel as a civilization problem rather than an engineering sprint.
A City That FliesChrysalis is organized like a Russian nesting doll, with each layer serving a distinct function.
While most spacecraft designs concentrate on propulsion and payload, Chrysalis works differently. Its concentric cylindrical shells follow a matryoshka principle: the outermost layer serves as a robotic warehouse and industrial zone, intended to help shield the interior from radiation and micrometeoroid impacts. Middle layers hold housing, healthcare, education, and recreation, while inner sections are reserved for agricultural fields, forests, and closed ecosystems. The central core houses command systems, communications, and landing shuttles. The entire structure is designed to rotate, producing artificial gravity and addressing the health consequences of centuries in weightlessness.
Propulsion, per the design, would reportedly rely on a direct fusion drive using deuterium and helium-3, targeting roughly 10 percent of the speed of light. That figure describes a design goal, not a demonstrated capability.
Born Into the MissionSeveral generations will live and die aboard before Chrysalis reaches its destination.
Where most space mission planning stops at the airlock, Chrysalis keeps going. The proposal envisions AI-assisted governance shared among humans, robots, and AI agents, with long-term knowledge-transfer systems designed to keep technical skills, cultural memory, and mission objectives intact across generations. Birth planning would reportedly help manage population size, with the design targeting a sustainable figure of around 1,500 people while preserving genetic diversity within the closed community.
Before launch, the initial inhabitants would reportedly spend 70 to 80 years in an Antarctic isolation settlement.
The goal is to stress-test social resilience and institutional continuity under conditions designed to approximate life aboard the vessel. The ethical question the proposal does not fully resolve sits at the center of the concept: people born mid-voyage would inherit a mission they never agreed to, governed by institutions they did not choose, traveling toward a planet whose habitability remains unconfirmed.
Chrysalis would be constructed like a Russian nesting doll, with several layers of living space encompassing each other around a central core.<br>(Image credit: Giacomo Infelise, Veronica Magli, Guido Sbrogio', Nevenka Martinello and Federica Chiara Serpe)
Chrysalis would be constructed like a Russian nesting doll, with several layers of living space encompassing each other around a central core.
(Image credit: Giacomo Infelise, Veronica Magli, Guido Sbrogio', Nevenka Martinello and Federica Chiara Serpe)
MoreThe Gap Between the Blueprint and the Build
Propulsion is the largest of several unresolved obstacles standing between this design and any real mission.
Commercial nuclear-fusion power generation is not an established operating industry. No publicly documented structure anywhere near 58 kilometers in scale has been assembled in orbit, though the designers suggest a 20 to 25 year construction period at the Earth-Moon L1 region as a proposal-level estimate. Closed-loop ecosystems, autonomous manufacturing, multigenerational medical care, and the social cohesion of an isolated community across four centuries all remain open problems.
The Project Hyperion competition jury praised Chrysalis for its system-level coherence, modularity, radiation-protection strategy, and attention to in-space manufacturing, according to the competition's official results page. That recognition reflects quality of thinking, not readiness to build. The team comprising Guido Sbrogio', Giacomo Infelise, Veronica Magli, Nevenka Martinello, and Federica Chiara Serpe has produced a framework connecting propulsion, ecology, architecture, governance, and ethics into one coherent question. Sustaining a functioning society during a 400-year voyage may ultimately be the harder half of the problem. Chrysalis at least has the honesty to ask both questions at once.
The 70/80 year pre-conditioning is interesting, and it seems to me well worth considering. The first two generations of prospective travelers would be born in that phase, and ** they ** would (presumably) get to decide if they want to participate in the venture.
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The destination of this proposed expedition is only four light years away.
That means that it is possible for communication to continue between the crew on board the vessel and residents of the Earth.
Intervals between messages would increase over time, but that increase would be gradual.
Persons who exchange messages as children would see replies arrive months, years and ultimately four years later.
However, the feeds of data from the two ends of the pipe would continue uninterrupted and in whatever quantity is affordable.
The ship and it's crew would (could) receive many channels of Earth news, entertainment and official transmissions.
Likewise, the ship and it's crew could send back data about the ship itself, the sky around the ship, and whatever news of current events on the ship the crew might like to share.
If some thought were put into setting them up, there could be "sister cities" established with particular families on the ship, so that relationships might be established and maintained despite the increasing time delay.
This set of communications could be helpful for morale on the ship, and it might help to keep the ship in the minds of some Earth people as the 400 years go by.
Considering how volatile the Earth has been in recent times, the Earth population may change significantly over 400 years.
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tahanson43206,
Since you posted about this, I've been thinking about ways to actually do this using near-term tech. I'll create a thread about my near-term sci-fi fantasy starship design. It's largely a scale-up of my existing ideas, but uses advanced fusion-based propulsion or afterburning fission-fragment rocket engines. Designing and fabricating the rest of the ship, particularly the all-important life support systems, is entirely within our technological capabilities. The propulsion tech is the only current "sci-fi" part, and it's still more of an engineering exercise than a greenfield research dilemma.
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