Amid the swirling vastness of galaxies, each a cosmic city of stars and planets, the silence raises a compelling question: could the very nature of galaxies themselves hold the key to why intelligent life remains unseen?

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Credits:
The Fermi Paradox: Galactic Great Filters
Episode 484; January 30, 2025
Written, Produced & Narrated by: Isaac Arthur
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Phase Shift, "Forest Night"
Chris Zabriskie, "Unfoldment, Revealment"
Stellardrone, "Billions and Billions"

The Fermi Paradox: Galactic Great Filters (Narration Only)

What if the "magic" of tomorrow is just science we don’t yet understand? In this episode, we explore the wildest speculative technologies—faster-than-light travel, Dyson Spheres, teleportation, wormholes, and more. Could these breakthroughs redefine our future or explain the Fermi Paradox? Find out as we dive into the impossible!

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Credits:
Impossible Technologies: The Clarketech Compendium 
Episode 486a; February 16, 2025
Written, Produced & Narrated by: Isaac Arthur
Editors: Ludwig Luska, Thomas Owen, Lukas Konecny
Graphics: Jeremy Jozwik, Ken York YD Visual, Mihail Yordanov, Sergio Botero
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Phase Shift, "Forest Night"
Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden"
Stellardrone, "Red Giant", "Billions and Billions"
Lombus, "Hydrogen Sonata", "Cosmic Soup"

Impossible Technologies: The Clarketech Compendium (Narration Only)

Hydropower has long been one of the world's most reliable sources of renewable energy, but how will it adapt to the challenges of the 21st century? In this episode, we explore the cutting-edge innovations shaping the future of hydroelectric power—from modular micro-hydro systems and improved pumped storage to tidal, wave, and even deep sea hydroelectric solutions.

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Credits:

The Future of Hydroelectric Power

Episode 493; April 3, 2025

Written, Produced & Narrated by: Isaac Arthur 

Select imagery/video supplied by Getty Images

Music Courtesy of Epidemic Sound http://epidemicsound.com/creator

Phase Shift, "Forest Night"

Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector"

Stellardrone, "Red Giant", "Billions and Billions"

The Future of Hydroelectric Power (Narration Only)

The Future of Hydroelectric Power

In a future of limitless resources, what challenges remain when scarcity fades but human desires endure? Join us as we explore the path to post-scarcity civilizations, where technology solves material needs—but purpose, meaning, and new challenges await.

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Credits:

Post-Scarcity Civilizations: Infinite Resources & Our Future

Episode 495; April 17, 2025

Written, Produced & Narrated by: Isaac Arthur

Edited by: Donagh Broderick

Graphics: Jeremy Jozwik, Ken York YD Visual

Select imagery/video supplied by Getty Images 

Music Courtesy of Epidemic Sound http://epidemicsound.com/creator

Markus Junnikkala, "A Fleet Behind the Moon"

Phase Shift, "Forest Night"

Kai Engel, "Endless Story About Sun and Moon"

Chris Zabriskie, "Unfoldment, Revealment",  "A New Day in a New Sector"

Taras Harkavyi, "Alpha and..."

Stellardrone, "Red Giant", "Billions and Billions"

Post-Scarcity Civilizations: Infinite Resources & Our Future (Narration Only)

Are rogue machines lurking in the cosmos, quietly outlasting their creators? We explore the eerie possibility that ancient AI remnants, abandoned or self-replicating, could be hidden throughout the galaxy—watching, waiting, and perhaps even shaping the fate of civilizations.

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Credits:
The Fermi Paradox  & Zombie AI: Are Rogue Machines Hiding in the Cosmos? 
Episode 494; April 10, 2025
Written, Produced & Narrated by: Isaac Arthur 
Editors: Briana Brownell & Donagh Broderick
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Phase Shift, "Forest Night"
Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden"
Stellardrone, "Red Giant", "Billions and Billions"

The Fermi Paradox  & Zombie AI: Are Rogue Machines Hiding in the Cosmos? (Narration Only)

If aliens invaded, how would humanity respond? From planetary defense and space warfare to unexpected diplomatic twists, we’ll explore the strategies, technologies, and scenarios that could decide our fate.

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Credits:
We've Been Invaded By Aliens... Now What?
Episode 494a; April 13, 2025
Written, Produced & Narrated by: Isaac Arthur
Edited by: Ludwig Luska
Graphics: Jeremy Jozwik, Ken York YD Visual, Legiontech Studios
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Sergey Cheremisinov, "Labyrinth"
Markus Junnikkala, "A Fleet Behind the Moon"
Phase Shift, "Forest Night"
Chris Zabriskie, "Unfoldment, Revealment",  "A New Day in a New Sector"
Stellardrone, "Red Giant"

We've Been Invaded By Aliens... Now What?

From genetically engineered warriors to armored giants storming enemy ships, we explore the science and fiction of space marines—super-soldiers built to conquer the stars. Join us as we examine real-world technologies and speculative enhancements that might one day bring these legendary troops to life.

Watch my exclusive video Post-Consciousness Civilizations: https://nebula.tv/videos/isaacarthur-postconsciousness-civilizations-evolving-beyond-human-awareness
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Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur
Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30.

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Credits:
Post-Scarcity Civilizations: Infinite Resources & Our Future
Episode 495a; April 20, 2025
Written, Produced & Narrated by: Isaac Arthur
Graphics: Jeremy Jozwik
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Markus Junnikkala, "A Fleet Behind the Moon"
Phase Shift, "Forest Night"
Chris Zabriskie, "Unfoldment, Revealment",  "A New Day in a New Sector"Stellardrone, "Red Giant", "Billions and Billions"

Space Marines (Narration Only)

What if humanity’s future isn’t on Earth—or even other planets—but in colossal artificial worlds built in space? In this episode, we explore the O’Neill Cylinder, a visionary space habitat that could house millions, serve as interstellar arks, and transform the cosmos into a network of orbital civilizations. Join us as we dive into the design, potential, and profound societal implications of these Islands in the Sky.

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Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30.

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Credits:
The O'Neill Cylinder Space Habitat: Islands In The Sky
Episode 496; April 24, 2025
Written, Produced & Narrated by: Isaac Arthur
Edited by: Briana Brownell
Graphics: Anthrofuturism, Apogii.uk, Katie Byrne, Jarred Eagley, Jeremy Jozwik, Justin Dixon, Ken York YD Visual, Sergio Botero, Udo Schroeter
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Markus Junnikkala, "A Fleet Behind the Moon"
Phase Shift, "Forest Night"
Kai Engel, "Endless Story About Sun and Moon"
Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector"
Taras Harkavyi, "Alpha and..."
Stellardrone, "Red Giant", "Billions and Billions"

The O'Neill Cylinder Space Habitat: Islands In The Sky (Narration Only)

It can be hard to hear a signal 100 miles away—so what does it take to build a beacon loud enough to be heard 100,000 light years away? In this episode, we explore galactic beacons: powerful transmissions that may teach, warn, or outlast the minds that made them.

Watch my exclusive video The End of Science https://nebula.tv/videos/isaacarthur-the-end-of-science
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Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur
Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30.

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Credits:
Galactic Beacons
Episode 440b; April 1, 2024
Written, Produced & Narrated by: Isaac Arthur
Graphics: Darth Biomech, Jeremy Jozwik, Ken York YD Visual, Sergio Botero
Select imagery/video supplied by Getty Images 
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator

Galactic Beacons: Teaching Tools or Tombstones? (Narration Only)

The concept of linking many minds together to act in concert, or even fuse into a new singular entity, has been popular in science fiction for decades. Today we will explore the idea and Networked Intelligence in general, to see how realistic it is, and what benefits or concerns might arise from it.

Watch the video version: https://youtu.be/NV7_abwM2ug

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Cover Art by Jakub Grygier: https://www.artstation.com/artist/jakub_grygier

Graphics Team:
Edward Nardella
Jarred Eagley
Justin Dixon
Katie Byrne
Kris Holland
Misho Yordanov
Murat Mamkegh
Pierre Demet
Sergio Botero
Stefan Blandin

Script Editing:
Andy Popescu
Connor Hogan
Edward Nardella
Eustratius Graham
Gregory Leal
Jefferson Eagley
Luca de Rosa
Mark Warburton
Michael Gusevsky
Mitch Armstrong
MolbOrg
Naomi Kern
Philip Baldock
Sigmund Kopperud
Tiffany Penner

Music
AJ Prasad, "Cold Shadows"
Lee Rosevere, "It's such a beautiful day"
Kai Engel, "Morbid Imagination"
Sergey Cheremisinov, "Jump in Infinity"
Markus Junnikkala, "A Memory of Earth"
Brandon Liew, "Into the Storm"

Hive Minds

Isaac Arthur