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The Race to the Stars: Building the Multigenerational Interstellar Spaceship

Humanity’s fascination with the unknown is a timeless impulse, rooted in curiosity and the desire to push boundaries, uncover mysteries, and open doors to new frontiers. What were once represented by voyages and the discovery of new islands and continents are now pursued in the vastness of the Universe. As we seek answers, provoke new questions, and open doors to endless possibilities, this drive continues to inspire. It has shaped countless literary and cinematic works, transforming interstellar exploration from a science fiction concept into a vision increasingly grounded in reality. One such visionary project is Project Hyperion, spearheaded by the Initiative for Interstellar Studies (i4is), which challenges humanity to develop practical solutions for interstellar travel through a design competition. By envisioning generation ships—vast, self-sustaining habitats capable of supporting multigenerational societies on journeys spanning centuries—the project not only pushes the boundaries of technology but also sparks social innovation, stretching the limits of our collective imagination.

The exploration of outer space, which began during the Cold War space race with milestones like the launch of Sputnik in 1957 and the Apollo 11 Moon landing in 1969, has driven advances in science, technology, and geopolitics. Since then, continuous efforts such as the International Space Station (ISS), launched in 1998, have provided platforms for microgravity experiments essential to research in biomedicine and physics, as well as preparation for lunar and Martian missions. Simultaneously, spacecraft have evolved from orbital missions to interplanetary exploration and, more recently, space tourism, with vehicles like SpaceX’s Crew Dragon and Blue Origin’s New Shepard offering unique experiences in space.

However, the challenge of interstellar exploration—journeys beyond our solar system to distant stars—presents far greater complexity and requires a radical reimagining of space technology. An interstellar spacecraft would not simply be a scaled-up version of today’s spaceships but a structure capable of sustaining journeys lasting centuries, traversing immense distances. To endure such long voyages, these ships must be self-sustaining, with closed-loop life support systems, food production, and resource recycling, creating an environment where people are born, live, and die. Beyond technological challenges, there are also social and psychological hurdles to prolonged space travel. Such a ship must be not only a high-performance machine but also a viable habitat for living, working, and fostering a society across generations. This requires rethinking how we organize coexistence, social relationships, and power dynamics in an isolated and confined environment.

Nuclear Fusion: Updates & Impacts

Explore the latest breakthroughs in nuclear fusion technology and their potential global impacts.

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Credits:
Nuclear Fusion: Updates & Impacts.
Episode 472a; November 10, 2024
Produced, Narrated & Written: Isaac Arthur.
Editors: Darius Said & Dillon Olander.
Graphics:
Jeremy Jozwik.
Ken York YD Visual.
Mafic Stufios.
Udo Schroeter.
Select imagery/video supplied by Getty Images.
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator.
Stellardrone, “In Time”, “Divine Cosmos”, “Red Giant”

NASA Unveils New Approach for Mars Sample Return Program

How will NASA conduct its Mars Sample Return (MSR) Program? This is what the renowned space agency recently discussed as it unveiled two potential landing options for MSR with the goal of determining a final option during the second half of 2026. This comes after NASA tasked a Mars Sample Return Strategic Review team to evaluate 11 proposals in September 2024 for returning samples from Mars to Earth while achieving cost-effectiveness while maximizing mission success.

Both options still call for loading the 30 sample tubes that have been collected and dropped across the Martian surface by NASA’s Perseverance rover during its trek on Mars. However, the Mars Ascent Vehicle, which will lift off from the Martian surface and deliver the samples to the orbiting capsule, will be smaller than previous designs. Additionally, past designs of the landed platform called for solar panels for energy, whereas new designs will incorporate a radioisotope power system for energy needs.

“Pursuing two potential paths forward will ensure that NASA is able to bring these samples back from Mars with significant cost and schedule saving compared to the previous plan,” NASA Administrator Bill Nelson said in a statement. “These samples have the potential to change the way we understand Mars, our universe, and – ultimately – ourselves. I’d like to thank the team at NASA and the strategic review team, led by Dr. Maria Zuber, for their work.”

Quantum breakthrough may lead to sustainable chiral spintronics

A team of physicists led by The City College of New York’s Lia Krusin-Elbaum has developed a novel technique that uses hydrogen cations (H+) to manipulate relativistic electronic bandstructures in a magnetic Weyl semimetal—a topological material where electrons mimic massless particles called Weyl fermions. These particles are distinguished by their chirality or “handedness” linked to their spin and momentum.

In the magnetic material MnSb₂Te₄, researchers unveiled a fascinating ability to “tune” and enhance the chirality of electronic transport by introducing , reshaping on-demand the energy landscapes—called Weyl nodes—within the material. This finding could open a breadth of new quantum device platforms for harnessing emergent topological states for novel chiral nano-spintronics and fault-tolerant quantum computing. Entitled “Transport chirality generated by a tunable tilt of Weyl nodes in a van der Waals topological magnet,” the study appears in the journal Nature Communications.

The tuning of Weyl nodes with H+ heals the system’s (Mn-Te) bond disorder and lowers the internode scattering. In this process—which The City College team tests in the Krusin Lab using angularly-resolved electrical transport—electrical charges move differently when the in-plane is rotated clockwise or counterclockwise, generating desirable low-dissipation currents. The reshaped Weyl states feature a doubled Curie temperature and a strong angular transport chirality synchronous with a rare field-antisymmetric longitudinal resistance—a low-field tunable ‘chiral switch’ that is rooted in the interplay of topological Berry curvature, chiral anomaly and a hydrogen-mediated form of Weyl nodes.

The far-reaching impacts of wildfire smoke — and how to protect yourself

The air we breathe can have profound effects on our physical and mental health. Is there any way of protecting yourself from this pervasive problem?

All but 1% of the world’s population is exposed to unhealthy air that exceeds World Health Organization (WHO) limits for pollutants. In parts of the world, air quality has rapidly improved through policies that aim to limit pollution. But elsewhere, gains in air quality are at risk of being lost.

More than 25% of the US population is exposed to air considered “unhealthy” by the Environmental Protection Agency (EPA), according to a report by the climate non-profit First Street Foundation. By 2050, the number of people exposed to “unhealthy” days is set to increase by more than half. The worst days of air pollution (“hazardous” or maroon, under the EPA’s system) are expected to rise by 27%.

Fully recyclable carbon nanotube fibers have far-reaching implications for manufacturing across sectors

In a significant step toward creating a sustainable and circular economy, Rice University researchers have published a study in the journal Carbon demonstrating that carbon nanotube (CNT) fibers can be fully recycled without any loss in their structure or properties. This discovery positions CNT fibers as a sustainable alternative to traditional materials like metals, polymers and the much larger carbon fibers, which are notoriously difficult to recycle.

“Recycling has long been a challenge in the materials industry—metals recycling is often inefficient and energy-intensive, polymers tend to lose their properties after reprocessing and carbon fibers cannot be recycled at all, only downcycled by chopping them up into short pieces,” said corresponding author Matteo Pasquali, director of Rice’s Carbon Hub and the A.J. Hartsook Professor of Chemical and Biomolecular Engineering, Materials Science and NanoEngineering and Chemistry.

“As CNT fibers are being scaled up, we asked whether and how these new materials could be recycled in the future so as to proactively avoid waste management problems that emerged as other engineered materials reached large-scale use. We expected that recycling would be difficult and would lead to significant loss of properties. Surprisingly, we found that fibers far exceed the recyclability potential of existing engineered materials, offering a solution to a major environmental issue.”

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