Could we sculpt dead planets into living worlds? From artificial crusts and orbital mirrors to taming tectonics and engineering biospheres, this is your definitive guide to turning alien rocks into second Earths.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

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Credits:

Interstellar Travel: Can We Survive The Long Journey?

Episode 725; June 15, 2025

Written, Produced & Narrated by: Isaac Arthur

Graphics:

Jarred Eagley

Jeremy Jozwik

Ken York YD Visual

Mafic Studios

Sergio Botero

Select imagery/video supplied by Getty Images

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

Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden", "Wonder Cycle"

Kai Engel, "Endless Story About Sun and Moon"

Taras Harkavyi, "Alpha and..."

Dark Future, "Staring Through" pt1

Miguel Johnson. "The Commanders", "Far From Home"

Lombus, "Hydrogen Sonata", "Cosmic Soup"

Aerium, "Deijocht"

Stellardrone, "Red Giant", "Solar Eclipse", "Billions and Billions"

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Could we sculpt dead planets into living worlds? From artificial crusts and orbital mirrors to taming tectonics and engineering biospheres, this is your definitive guide to turning alien rocks into second Earths.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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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SFIA Discord Server: https://discord.gg/53GAShE

Credits:

Interstellar Travel: Can We Survive The Long Journey?

Episode 725; June 15, 2025

Written, Produced & Narrated by: Isaac Arthur

Graphics:

Jarred Eagley

Jeremy Jozwik

Ken York YD Visual

Mafic Studios

Sergio Botero

Select imagery/video supplied by Getty Images

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

Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden", "Wonder Cycle"

Kai Engel, "Endless Story About Sun and Moon"

Taras Harkavyi, "Alpha and..."

Dark Future, "Staring Through" pt1

Miguel Johnson. "The Commanders", "Far From Home"

Lombus, "Hydrogen Sonata", "Cosmic Soup"

Aerium, "Deijocht"

Stellardrone, "Red Giant", "Solar Eclipse", "Billions and Billions"

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Interstellar travel may one day take us to the stars, but surviving the journey could be the greatest challenge humanity has ever faced. In this episode, we explore the physical, psychological, and societal trials of a voyage that could span centuries—or forever.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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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SFIA Discord Server: https://discord.gg/53GAShE

Credits:

Interstellar Travel: Can We Survive The Long Journey?

Episode 724; June 12, 2025

Written, Produced & Narrated by: Isaac Arthur

Graphics:

Bryan Versteeg

Jarred Eagley

Jeremy Jozwik

Melanvois

Udo Schroeter

Select imagery/video supplied by Getty Images

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

Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden", "Wonder Cycle"

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

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Interstellar travel may one day take us to the stars, but surviving the journey could be the greatest challenge humanity has ever faced. In this episode, we explore the physical, psychological, and societal trials of a voyage that could span centuries—or forever.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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.

Visit our Website: http://www.isaacarthur.net

Join Nebula: https://go.nebula.tv/isaacarthur

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SFIA Discord Server: https://discord.gg/53GAShE

Credits:

Interstellar Travel: Can We Survive The Long Journey?

Episode 724; June 12, 2025

Written, Produced & Narrated by: Isaac Arthur

Graphics:

Bryan Versteeg

Jarred Eagley

Jeremy Jozwik

Melanvois

Udo Schroeter

Select imagery/video supplied by Getty Images

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

Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden", "Wonder Cycle"

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

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

From quantum tunneling to cosmic inflation, we journey through the theories behind the Big Bang and beyond — and ask the big question: could another Big Bang be in our cosmic future?

Visit our Website: http://www.isaacarthur.net

Join Nebula: https://go.nebula.tv/isaacarthur

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Could We See a Second Big Bang?

Episode 724.1; June 10, 2025

Written, Produced & Narrated by: Isaac Arthur

Select imagery/video supplied by Getty Images

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

0:00 Intro

1:59 Why Did the Big Bang Happen?

3:01 Quantum Fluctuations

5:20 Inflation and False Vacuum Decay

7:56 Cyclic Models and the Ekpyrotic Universe

9:43 Big Bounce Cosmology

12:35 Tunneling from Nothing

14:04 Beginnings, Endings, and Echoes

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Are we alone in the universe—or just early to the party? We’ll explore the math, models, and megastructures that might answer how many alien civilizations are out there, and why the night sky remains so quiet.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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.

Visit our Website: http://www.isaacarthur.net

Join Nebula: https://go.nebula.tv/isaacarthur

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Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content.

SFIA Discord Server: https://discord.gg/53GAShE

Credits:

How Many Alien Civilizations Are There?

Episode 723; June 8, 2025

Written, Produced & Narrated by: Isaac Arthur

Editor: Ludwig Luska

Graphics: Ken York YD Visual

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"

Koalips, "Kvazar"

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

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Are we alone in the universe—or just early to the party? We’ll explore the math, models, and megastructures that might answer how many alien civilizations are out there, and why the night sky remains so quiet.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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.

Visit our Website: http://www.isaacarthur.net

Join Nebula: https://go.nebula.tv/isaacarthur

Support us on Patreon: https://www.patreon.com/IsaacArthur

Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur

Facebook Group: https://www.facebook.com/groups/1583992725237264/

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Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content.

SFIA Discord Server: https://discord.gg/53GAShE

Credits:

How Many Alien Civilizations Are There?

Episode 723; June 8, 2025

Written, Produced & Narrated by: Isaac Arthur

Editor: Ludwig Luska

Graphics: Ken York YD Visual

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"

Koalips, "Kvazar"

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

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

A new industrial revolution is coming—not on Earth, but above it. This episode delves into how orbital shipyards will produce everything from shuttles to megastructures, changing how we explore and inhabit space.

Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding

Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur

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.

Visit our Website: http://www.isaacarthur.net

Join Nebula: https://go.nebula.tv/isaacarthur

Support us on Patreon: https://www.patreon.com/IsaacArthur

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Facebook Group: https://www.facebook.com/groups/1583992725237264/

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Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content.

SFIA Discord Server: https://discord.gg/53GAShE

Credits:

Orbital Shipyards: Building Fleets in Space

Episode 722; June 5, 2025; Nebula Exclusive

Written, Produced, & Narrated by: Isaac Arthur

Graphics:

Anthrofuturism

Bryan Versteeg

Fishy Tree

Jeremy Jozwik

Melanovis

Sergio Botero

SpaceResourcesCGI

Udo Schroeter

Select imagery/video supplied by Getty Images

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

Phase Shift, "Forest Night"

Kai Engel, "Endless Story of Sun and Moon"

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

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

Chapters

0:00 Intro

0:15 Why Build in Orbit?

1:29 The Gravity Well Problem

3:22 Material Sourcing – The Importance of ISRU

5:44 Early Orbital Shipyards – Existing & Near-Future Projects

6:37 Lessons from Space Stations & Prototypes

8:22 Port George & Linus Scrapyard – Revisiting Fictional Shipyards

13:08 Infrastructure & Logistics of Orbital Shipyards

23:39 Constructing Different Types of Ships

31:58 Challenges of Large-Scale Shipbuilding

34:10 Maintenance, Repairs, and Refits – Sustaining a Spacefaring Fleet

39:25 Salvage and Recycling

40:37 The Future of Orbital Shipyards – Expanding Beyond Earth

43:03 The Rise of Megastructure Shipyards

44:29 Privatization and the Spacefaring Economy

46:12 Shipyards as Strategic Military and Political Assets

47:54 The Role of AI, Automation, and Post-Human Workforces

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.