Uploaded August 2025 | Updated September 2026, 2 weeks ago
Imagine engineering projects so vast they mold galaxies into new shapes. We’ll explore the staggering feats of Kardashev-3 and beyond civilizations, crafting CARD galaxies, Birch Planets, and even rearranging superclusters.
Watch my exclusive video Dark Biospheres: nebula.tv/videos/isaacarthur-dark-biospheres-life-on-worlds-without-sunlight
Get Nebula using my link for 40% off an annual subscription: go.nebula.tv/isaacarthur
Get a Lifetime Membership to Nebula for only $300: go.nebula.tv/lifetime?ref=isaacarthur
Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $36.
Visit our Website: isaacarthur.net
Join Nebula: go.nebula.tv/isaacarthur
Support us on Patreon: patreon.com/IsaacArthur
Support us on Subscribestar: subscribestar.com/isaac-arthur
Facebook Group: facebook.com/groups/1583992725237264
Reddit: reddit.com/r/IsaacArthur
Twitter: twitter.com/Isaac_A_Arthur on Twitter and RT our future content.
SFIA Discord Server: discord.gg/53GAShE
Credits:
Spaceport Innovations - Designing the Next Generation of Launch Sites
August 3, 2025; Episode 746
Written, Produced & Narrated by: Isaac Arthur
Galaxy-Scale Megastructures & Kardashev-3 Civilizations
Written by: Isaac Arthur
Editor: Darius Said
Graphics: Jeremy Jozwik, Ken York, Sergio Botero, Steve Bowers
Select imagery/video supplied by Getty Images
Music Courtesy of Epidemic Sound epidemicsound.com/creator
Stellardrone, "Endeavour", "Red Giant", &"Billions and Billions"
Chapters
0:00 Intro
1:38 The Power of a Galaxy
4:02 Compact Artificial Red Dwarf Galaxies – CARD Galaxies
11:18 No-FTL Civilizations: Patience and Proliferation
15:37 Moving the Stars
19:26 Rearranging Galaxies and Superclusters
29:38 Black Holes as Galactic Waypoints and Interstellar Hubs
33:11 Birch Planets: The Final No-FTL Civilization
42:25 Faster-Than-Light Civilizations: Beyond the Light Barrier
Imagine engineering projects so vast they mold galaxies into new shapes. We’ll explore the staggering feats of Kardashev-3 and beyond civilizations, crafting CARD galaxies, Birch Planets, and even rearranging superclusters.
Watch my exclusive video Dark Biospheres: nebula.tv/videos/isaacarthur-dark-biospheres-life-on-worlds-without-sunlight
Get Nebula using my link for 40% off an annual subscription: go.nebula.tv/isaacarthur
Get a Lifetime Membership to Nebula for only $300: go.nebula.tv/lifetime?ref=isaacarthur
Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $36.
Visit our Website: isaacarthur.net
Join Nebula: go.nebula.tv/isaacarthur
Support us on Patreon: patreon.com/IsaacArthur
Support us on Subscribestar: subscribestar.com/isaac-arthur
Facebook Group: facebook.com/groups/1583992725237264
Reddit: reddit.com/r/IsaacArthur
Twitter: twitter.com/Isaac_A_Arthur on Twitter and RT our future content.
SFIA Discord Server: discord.gg/53GAShE
Credits:
Spaceport Innovations - Designing the Next Generation of Launch Sites
August 3, 2025; Episode 746
Written, Produced & Narrated by: Isaac Arthur
Galaxy-Scale Megastructures & Kardashev-3 Civilizations
Written by: Isaac Arthur
Editor: Darius Said
Graphics: Jeremy Jozwik, Ken York, Sergio Botero, Steve Bowers
Select imagery/video supplied by Getty Images
Music Courtesy of Epidemic Sound epidemicsound.com/creator
Stellardrone, "Endeavour", "Red Giant", &"Billions and Billions"
Chapters
0:00 Intro
1:38 The Power of a Galaxy
4:02 Compact Artificial Red Dwarf Galaxies – CARD Galaxies
11:18 No-FTL Civilizations: Patience and Proliferation
15:37 Moving the Stars
19:26 Rearranging Galaxies and Superclusters
29:38 Black Holes as Galactic Waypoints and Interstellar Hubs
33:11 Birch Planets: The Final No-FTL Civilization
42:25 Faster-Than-Light Civilizations: Beyond the Light Barrier
