The Radical Plan to Build a Spaceship to Carry Humans For Generations

The dream of traversing the depths of space and planting the seed of human civilization on another planet has existed for generations.

For long as we've known that most stars in the Universe are likely to have their own system of planets, there have been those who advocated that we explore them (and even settle on them).

With the dawn of the Space Age, this idea was no longer just the stuff of science fiction and became a matter of scientific study. Unfortunately, the challenges of venturing beyond Earth and reaching another star system are myriad.

When it comes down to it, there are only two ways to send crewed missions to exoplanets. The first is to develop advanced propulsion systems that can achieve relativistic speeds (a fraction of the speed of light). The second involves building spacecraft that can sustain crews for generations – aka. a Generation Ship (or Worldship).

On November 1st, 2024, Project Hyperion launched a design competition for crewed interstellar travel via generation ships that would rely on current and near-future technologies. The competition is open to the public and will award a total of $10,000 (USD) for innovative concepts.

Project Hyperion is an international, interdisciplinary team composed of architects, engineers, anthropologists, and urban planners. Many of them have worked with agencies and institutes like NASA, the ESA, and the Massachusetts Institute of Technology (MIT).

Their competition is sponsored by the Initiative for Interstellar Studies (i4is), a non-profit organization incorporated in the UK dedicated to research that will enable robotic and human exploration and the settlement of exoplanets around nearby stars.

Artist's concept of a generation ship. (Maciej Rebisz & Michel Lamontagne/Project Hyperion)

While concepts for an interstellar spacecraft go back to the early Space Age, interest in the field has grown considerably in the past two decades. This is largely due to the recent explosion in the number of known exoplanets in our galaxy, which currently stands at 5,787 confirmed planets in 4,325 star systems.

This is illustrated by concepts like Breakthrough Starshot, Swarming Proxima Centauri, and the Genesis Project. These concepts leverage gram-scale spacecraft, directed energy (lasers), and lightsails to achieve speeds of up to 20% of the speed of light, allowing them to make the journey in decades rather than centuries or millennia.

However, sending crewed spacecraft to other star systems with enough passengers to settle on another planet is far more challenging.

As addressed in a previous article, a spacecraft relying on known or technically feasible propulsion methods would take between 1,000 and 81,000 years to reach even the nearest star (Proxima Centauri).

While some advanced concepts like Project Orion, Daedalus, and Icarus could theoretically reach Proxima Centauri in 36 to 85 years, the costs and amount of propellant needed are prohibitive.

The alternative to these "go fast" concepts is to settle in for the long ride, which may last centuries or even millennia. This necessitates a spacecraft of sufficient size capable of accommodating hundreds (or thousands) of human beings over multiple generations.

To save room and reduce the mass of cargo space, the crews will need to grow much of their food and rely on life support systems that are bioregenerative in nature. In short, the ship would need to be self-sustaining so the passengers could live comfortable, healthy lives until they reached their destination.

Andreas Hein, an Associate Professor of Aerospace Engineering at the University of Luxembourg and the Chief Scientist at the Interdisciplinary Centre for Security, Reliability and Trust, is part of the Hyperion Project's Organizing Committee. As he told Universe Today via email:

"Think about the difference between a drone and an ocean liner. Previous designs for interstellar spacecraft, such as Orion, Daedalus, and Icarus, focused on uncrewed probes with the primary objective of gathering scientific data from target star systems, including searching for signs of life.

"In contrast, generation ships are designed to transport a crew, with the primary goal of settling an exoplanet or other celestial body in the target star system. They also tend to be much larger than interstellar probes, though they would likely use similar propulsion systems, such as fusion-based propulsion."

Generation Ships

The first known description of a generation ship was made by rocketry engineer Robert H. Goddard, one of the "forefathers of modern rocketry," for whom NASA's Goddard Space Flight Center is named.

In his 1918 essay, "The Ultimate Migration," he described an "interstellar ark" leaving the Solar System in the distant future after the Sun reached the end of its life cycle. The passengers would cryogenically frozen or in a state of induced torpor for much of the journey except for the pilot, who would be awakened periodically to steer the ship.

Goddard recommended that the ship be powered by atomic energy if the technology were realized. If not, a combination of hydrogen, oxygen, and solar energy would suffice. Goddard calculated that these power sources would allow the vessel to achieve velocities of 4.8 to 16 km/s (3 to 10 mi/s), or roughly 57,936 km/h (36,000 mph).

This was followed by famed Russian rocket scientist and cosmologist Konstantin E. Tsiolkovsky, also recognized as one of the "forefathers of modern rocketry." In 1928, he wrote an essay titled "The Future of Earth and Mankind" that described an interstellar "Noah's Ark."

In Tsiolkovsky's version, the spaceship would be self-sufficient, and the crew would be awake for the journey, which would last for thousands of years.

In 1964, NASA scientist Dr. Robert Enzmann proposed the most detailed concept to date for a generation ship, known as an "Enzmann Starship." The proposal called for a ship measuring 600 meters (2,000 feet) in length powered by a fusion thruster that uses deuterium as a propellant. According to Enzmann, this ship would house an initial crew of 200 people with room for expansion along the way.

In recent years, the concept has been explored from various angles, from biological and psychological to ethical. This included a series of studies (2017-2019) conducted by Dr. Frederic Marin of the Astronomical Observatory of Strasbourg using tailor-made numerical software (called HERITAGE).

In the first two studies, Dr. Marin and colleagues conducted simulations that showed that a minimum crew of 98 (max. 500) would need to be coupled with a cryogenic bank of sperm, eggs, and embryos to ensure genetic diversity and good health upon arrival.

In the third study, Dr. Marin and another group of scientists determined that the ship carrying them would need to measure 320 meters (1050 feet) in length, 224 meters (735 feet) in radius, and contain 450 m² (~4,850 ft²) of artificial land to grow enough food to sustain them.

In short, these proposals and studies establish that a generation ship and its crew must bring "Earth with them" and rely on bioregenerative systems to replenish their food, water, and air throughout generations.

As noted, most studies regarding interstellar exploration have focused on probes or ships and tended to emphasize speed over ensuring passengers could make the journey.

As Hein explained, this makes the Hyperion Project the first competition to focus on generation ships and ensuring the interstellar voyagers remain healthy and safe until they arrive in a nearby star system:

"This competition is unprecedented—a true first. To our knowledge, it marks the first time a design competition specifically focused on generation ships has been launched. It builds on our team's prior research, conducted since 2011, which addresses fundamental questions such as the required population size.

"This competition uniquely explores the complex interplay between generation ship technologies and the dynamics of a highly resource-constrained society.

"Most studies have focused on the technological aspects, such as propulsion and life support, while often treating the ship's technology and onboard society as separate issues. This approach is understandable given the challenge of analyzing these interdependencies. We even got the advice to stay away.

"Our goal is to take an initial step toward exploring and envisioning these interdependencies. We aim to be Cayley instead of Da Vinci. Da Vinci imagined aircraft, but Cayley conceived their basic design principles, which paved the way for the Wright Brothers."

The Competition

Registration for the competition will remain open until December 15th, 2024, and all participating teams must pay a $20 registration fee. The top three winning entries will be announced on June 2nd, 2025, and awarded $5000 for first place, $3000 for second, and $2000 for third.

In addition, ten teams will receive honorary mentions for creative and innovative ideas. For more information, check out Project Hyperion's website and the Mission Brief.

Per their mission statement, Project Hyperion is a preliminary study and feasibility assessment for crewed interstellar flight using current and near-future technologies.

The goal is to inform the public about the future possibility of interstellar space travel and to guide future research and technology development. As they state on their website, the competition has the following theme:

"Humanity has overcome the great sustainability crisis in the 21st century and has transitioned into an era of sustainable abundance, both on Earth and in space.

"Humanity has now reached the capacity to develop a generation ship without major sacrifices. An Interstellar Starship flies by an icy planet in a nearby solar system.

"Going beyond the classical examination of the problem of Interstellar propulsion and structural design for a voyage lasting multiple centuries, what might be the ideal type of habitat architecture and society in order to ensure a successful trip?"

Participants will be tasked with designing the ship, its habitat, and its subsystems, including details on its architecture and society. The Project Brief describes other important Boundary Conditions, including the duration of the mission, its destination, and other important considerations.

The mission duration is 250 years from launch to arrival at the target star system, consistent with the ship having advanced propulsion capable of achieving a fraction of the speed of light.

To ensure the health and safety of the crew, the ship's habitat must have atmospheric conditions similar to Earth, protection from galactic rays, micrometeorites, and interstellar dust (necessary for relativistic space travel).

The ship must also provide artificial gravity via rotating sections, but "parts of the habitat can have reduced gravity." The habitat must also provide accommodation and decent living conditions for 1000 plus or minus 500 people throughout the trip. The habitat will also need to be designed in such a way that it can be modified to meet changing needs.

The society's structure must allow for cultural variations, including language, ethics, family structure, beliefs, aesthetics, family structure, and other social factors.

The competition also considers knowledge retention and loss relative to Earth, which they describe as "almost inevitable."

Cameron Smith, an anthropologist at Portland State University and the University of Arizona's Center for Human Space Exploration (CHaSE), is also a member of Project Hyperion's Organizing Committee. As he explained to Universe Today:

"[T]he situation of a population, let's say thousands or even 1500 people, traveling in isolation for centuries would be unique to the human experience.

"So just as we plan for the health of the architecture and the hardware, maintaining them to keep them in a good state over this time span, we can plan for the health and maintenance of both biology and culture. And we have an excellent guide which is evolution.

"Evolution is at the heart of all life sciences, and it also, in many ways, applies to cultural change through time. Biology evolves, and cultures evolve. And we have learned how to manage our cultures on Earth to fit a wide variety of situations.

"The idea, however, is to get people thinking about how culture might be adjusted for the unusual conditions I've outlined.

"Separation from Earth, separation from other populations of humans, except by radio or video communication – which will become less and less as they get farther from Earth – what could change through time of the voyage that would require cultural adjustment?"

Throughout the trip, the population must also have access to basic products (clothing, shelter, etc.). The mass of the habitat is to be as low as possible, reliable over the entire duration of the journey, and include redundant systems. The generation ship's target destination is a rocky planet in a nearby star system (like Proxima b).

In an interesting twist, the competition stresses that this planet will have an artificial ecosystem created by a precursor probe, à la Project Genesis. As a result, the crews will not require any significant genetic or biological adaptations to survive in that ecosystem. As Hein explained:

"250 years in a tin can and staying happy, aka. can a society thrive in a severely resource-constrained environment? Answering this question is essential for designing a generation ship and may also offer insights into sustainable futures on Earth.

"From my perspective, there has been a significant lack of imaginative solutions to this challenge. 250 years in a tin can and staying happy, aka, can a society thrive in a severely resource-constrained environment?'

"Answering this question is essential for designing a generation ship and may also offer insights into sustainable futures on Earth. From my perspective, there has been a significant lack of imaginative solutions to this challenge."

"We also hope to raise awareness of the complexities underlying today's technologies. Which technologies could or should be preserved on a generation ship, and which may be lost?

"Research shows that a society's population size affects the diversity and complexity of its technologies. Most modern technologies require intricate supply chains involving numerous companies, infrastructure, and regulatory systems.

"Therefore, a generation ship will likely rely on low-tech solutions unless disruptive technologies, like molecular manufacturing or Standard Template Constructs (as depicted in Warhammer 40k), become feasible."

An Interdisciplinary Approach

A major focus of the competition is interdisciplinary research, reflective of the organizing committee itself. This has become a trend in space research, thanks in large part to the rise of the commercial space industry.

For many companies and non-profits today, traditional research is expanding beyond aerospace engineering and incorporating architecture and interior design, biology, sociology, psychology, agriculture, and other disciplines to create concepts that will allow for healthy and sustainable living in space.

Per the rules, teams must consist of at least one architectural designer, engineer, and social scientist (a sociologist, anthropologist, etc.). As Yazgi Demirbas Pech, an architect and designer with the Organizing Committee, explained:

"We hope this competition will inspire greater interdisciplinary collaboration, emphasizing the value of fields such as architecture and social sciences—especially critical in planning for long-duration, long-distance missions.

"A holistic approach that integrates these diverse fields can contribute to more sustainable and human-centered solutions for space exploration.

"Unlike traditional architectural practices on Earth, space architecture requires a delicate balance between strict technical constraints—such as limited physical space, extreme environmental conditions, and restricted resources—and the essential human needs for comfort, safety, and psychological well-being.

"Here, architecture becomes a life-sustaining element, enabling people to live, work, and thrive across vast distances and timescales.

"Through this competition, we invite teams to challenge conventional design principles and redefine what "home" means among the stars. Including architects or architecture students on teams will undoubtedly add fresh perspectives to this thought-provoking competition."

Solving for Space Solves for Earth

Another important aspect of the competition is the desire to inspire ideas that will also have applications and benefits here on Earth. This is another crucial aspect of the future of space exploration, which includes plans for creating outposts on the Moon, Mars, and beyond.

Like a generation ship, missions operating farther from Earth cannot rely on regular resupply missions sent from Earth. This means that habitats must be as self-sufficient as possible and ensure that inhabitants have enough air, water, and food to live comfortably.

For decades, scientists and planners have looked to Earth's natural environment for inspiration. This was the purpose of the Biosphere 2 project, which conducted two experiments between 1991 and 1994 in which volunteers lived in a sealed biome that mimics Earth's many environments.

Since 2007, the University of Arizona has used the facility to conduct research through its CHaSE program while remaining open to the public.

"Since the 1990s, [Biosphere 2] has been a research center for closed ecosystems as though on a starship, and the research here continues. [I am] actually residing at the biosphere until January, and I am looking at the stars and engaged in all of this right now," said Smith, who wrote to Universe Today from the facility.

As he went on to note, research from this experiment and similar studies have significant applications for life here on Earth, mainly because there is no margin for error in space:

"[T]he planning and preparation going into the starship in terms of its culture and biological protections for the offspring would be very carefully designed to give the greatest protections to them, perhaps in ways more specifically tailored to their survival and good health than in any culture ever on Earth.

"On the interstellar voyage, things must go just right to survive over multiple generations in the closed ecosystem, so planning and preparation would have to be very thorough."

Since failure in space often means death, especially when people are stationed far from Earth where rescue missions would take too long to reach them, the technologies future explorers and settlers rely on must be regenerative, fail-proof, and sustainable over time.

This research and development will have direct benefits when it comes to the most pressing problems we face here on Earth: climate change, overpopulation, poverty and hunger, and the need for sustainable living. As Pech emphasized:

"I believe that thinking beyond Earth can offer valuable insights into how we might improve life here on 'spaceship Earth.' Just as in space, where we face numerous challenges, our planet requires innovative approaches to foster harmony and resilience amidst current global conflicts and challenges."

There's also the added benefit of stimulating questions about life in the Universe and where extraterrestrial civilizations (ETCs) could already be traveling among the stars. For decades, scientists have explored these questions as part of the Fermi Paradox. As Hein explained:

"Finally, just as Project Daedalus demonstrated the theoretical feasibility of interstellar travel, we aim to establish a similar 'existence proof' for human travel to the stars.

"Achieving this will add new perspectives to the Fermi Paradox: if we can envision crewed interstellar travel today, a more advanced civilization should have achieved it already. So, where are they?"

Those interested in the competition or have more questions are encouraged to contact the Initiative for Interstellar Studies at [email protected]. The i4is will remain open to Q&A until December 1st, 2024.

This article was originally published by Universe Today. Read the original article.